{"type": "FeatureCollection", "features": [{"id": "10.1016/j.pbi.2023.102405", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:16:34Z", "type": "Journal Article", "created": "2023-06-26", "title": "Turning up the volume: How root branching adaptive responses aid water foraging", "description": "Access to water is critical for all forms of life. Plants primarily access water through their roots. Root traits such as branching are highly sensitive to water availability, enabling plants to adapt their root architecture to match soil moisture distribution. Lateral root adaptive responses hydropatterning and xerobranching ensure new branches only form when roots are in direct contact with moist soil. Root traits are also strongly influenced by atmospheric humidity, where a rapid drop leads to a promotion of root growth and branching. The plant hormones auxin and/or abscisic acid (ABA) play key roles in regulating these adaptive responses. We discuss how these signals are part of a novel 'water-sensing' mechanism that couples hormone movement with hydrodynamics to orchestrate root branching responses.", "keywords": ["2. Zero hunger", "Soil", "Plant Growth Regulators", "Water", "15. Life on land", "Plant Roots", "6. Clean water", "Abscisic Acid"]}, "links": [{"href": "https://doi.org/10.1016/j.pbi.2023.102405"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Current%20Opinion%20in%20Plant%20Biology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.pbi.2023.102405", "name": "item", "description": "10.1016/j.pbi.2023.102405", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.pbi.2023.102405"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-10-01T00:00:00Z"}}, {"id": "10.1016/j.tplants.2018.05.011", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:17:11Z", "type": "Journal Article", "created": "2018-06-15", "title": "Out of Shape During Stress: A Key Role for Auxin", "description": "In most abiotic stress conditions, including salinity and water deficit, the developmental plasticity of the plant root is regulated by the phytohormone auxin. Changes in auxin concentration are often attributed to changes in shoot-derived long-distance auxin flow. However, recent evidence suggests important contributions by short-distance auxin transport from local storage and local auxin biosynthesis, conjugation, and oxidation during abiotic stress. We discuss here current knowledge on long-distance auxin transport in stress responses, and subsequently debate how short-distance auxin transport and indole-3-acetic acid (IAA) metabolism play a role in influencing eventual auxin accumulation and signaling patterns. Our analysis stresses the importance of considering all these components together and highlights the use of mathematical modeling for predictions of plant physiological responses.", "keywords": ["0301 basic medicine", "0303 health sciences", "abiotic stress", "Indoleacetic Acids", "auxin transport", "mathematical modeling", "Biological Transport", "IAA homeostasis", "Models", " Theoretical", "Plants", "Plant Roots", "Article", "03 medical and health sciences", "Plant Growth Regulators", "root phenotypic plasticity", "Stress", " Physiological", "auxin", "Plant Physiological Phenomena", "Signal Transduction"]}, "links": [{"href": "https://doi.org/10.1016/j.tplants.2018.05.011"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Trends%20in%20Plant%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.tplants.2018.05.011", "name": "item", "description": "10.1016/j.tplants.2018.05.011", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.tplants.2018.05.011"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-09-01T00:00:00Z"}}, {"id": "10.1016/j.xplc.2020.100104", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:17:13Z", "type": "Journal Article", "created": "2020-08-21", "title": "No Home without Hormones: How Plant Hormones Control Legume Nodule Organogenesis", "description": "The establishment of symbiotic nitrogen fixation requires the coordination of both nodule development and infection events. Despite the evolution of a variety of anatomical structures, nodule organs serve\u00a0a common purpose in establishing a localized area that facilitates efficient nitrogen fixation. As in all plant developmental processes, the establishment of a new nodule organ is regulated by plant hormones. During nodule initiation, regulation of plant hormone signaling is one of the major targets of symbiotic signaling. We review the role of major developmental hormones in the initiation of the nodule organ and argue that the manipulation of plant hormones is a key requirement for engineering nitrogen fixation in non-legumes as the basis for improved food security and sustainability.", "keywords": ["0301 basic medicine", "2. Zero hunger", "0303 health sciences", "Cytokinins", "hormones", "nodule", "Fabaceae", "legume", "Review Article", "Ethylenes", "Plant Root Nodulation", "symbiosis", "Gibberellins", "03 medical and health sciences", "Plant Growth Regulators", "nitrogen fixation", "Nitrogen Fixation", "Symbiosis"]}, "links": [{"href": "https://doi.org/10.1016/j.xplc.2020.100104"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20Communications", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.xplc.2020.100104", "name": "item", "description": "10.1016/j.xplc.2020.100104", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.xplc.2020.100104"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-09-01T00:00:00Z"}}, {"id": "10.1073/pnas.2406373122", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:18:01Z", "type": "Journal Article", "created": "2025-02-05", "title": "Abscisic acid signaling gates salt-induced responses of plant roots", "description": "

Soil salinity presents a dual challenge for plants, involving both osmotic and ionic stress. In response, plants deploy distinct yet interconnected mechanisms to cope with these facets of salinity stress. In this investigation, we observed a substantial overlap in the salt (NaCl)-induced transcriptional responses of Arabidopsis roots with those triggered by osmotic stress or the plant stress hormone abscisic acid (ABA), as anticipated. Notably, a specific cluster of genes responded uniquely to sodium (Na + ) ions and are not regulated by the known monovalent cation sensing mechanism MOCA1 . Surprisingly, expression of sodium-induced genes exhibited a negative correlation with the ABA response and preceded the activation of genes induced by the osmotic stress component of salt. Elevated exogenous ABA levels resulted in the complete abolition of sodium-induced responses. Consistently, the ABA insensitive snrk2.2/2.3 double mutant displayed prolonged sodium-induced gene expression, coupled with increased root cell damage and root swelling under high salinity conditions. Moreover, ABA biosynthesis and signaling mutants were unable to redirect root growth to avoid high sodium concentrations and had increased sodium accumulation in the shoot. In summary, our findings unveil an unexpected and pivotal role for ABA signaling in mitigating cellular damage induced by salinity stress and modulating sodium-induced responses in plant roots. During nutrient scarcity, plants can adapt their developmental strategy to maximize their chance of survival. Such plasticity in development is underpinned by hormonal regulation, which mediates the relationship between environmental cues and developmental outputs. In legumes, endosymbiosis with nitrogen-fixing bacteria (rhizobia) is a key adaptation for supplying the plant with nitrogen in the form of ammonium. Rhizobia are housed in lateral root-derived organs termed nodules that maintain an environment conducive to Nitrogenase in these bacteria. Several phytohormones are important for regulating the formation of nodules, with both positive and negative roles proposed for gibberellin (GA). In this study, we determine the cellular location and function of bioactive GA during nodule organogenesis using a genetically encoded second-generation GA biosensor, GIBBERELLIN PERCEPTION SENSOR 2 in Medicago truncatula. We find endogenous bioactive GA accumulates locally at the site of nodule primordia, increasing dramatically in the cortical cell layers, persisting through cell divisions, and maintaining accumulation in the mature nodule meristem. We show, through misexpression of GA-catabolic enzymes that suppress GA accumulation, that GA acts as a positive regulator of nodule growth and development. Furthermore, increasing or decreasing GA through perturbation of biosynthesis gene expression can increase or decrease the size of nodules, respectively. This is unique from lateral root formation, a developmental program that shares common organogenesis regulators. We link GA to a wider gene regulatory program by showing that nodule-identity genes induce and sustain GA accumulation necessary for proper nodule formation.While the importance of plant water relations in determining crop response to soil water availability is difficult to over\uffe2\uff80\uff90emphasise, under many circumstances, plants maintain their leaf water status as the soil dries yet shoot gas exchange and growth is restricted. Such observations lead to development of a paradigm that root\uffe2\uff80\uff90to\uffe2\uff80\uff90shoot signals regulate shoot physiology, and a conceptual framework to test the importance of different signals such as plant hormones in these physiological processes. Nevertheless, shoot\uffe2\uff80\uff90to\uffe2\uff80\uff90root (hormonal) signalling also plays an important role in regulating root growth and function and may dominate when larger quantities of a hormone are produced in the shoots than the roots. Here, we review the evidence for acropetal and basipetal transport of three different plant hormones (abscisic acid, jasmonates, strigolactones) that have antitranspirant effects, to indicate the origin and action of these signalling systems. The physiological importance of each transport pathway likely depends on the specific environmental conditions the plant is exposed to, specifically whether the roots or shoots are the first to lose turgor when exposed to drying soil or elevated atmospheric demand, respectively. All three hormones can interact to influence each other's synthesis, degradation and intracellular signalling to augment or attenuate their physiological impacts, highlighting the complexity of unravelling these signalling systems. Nevertheless, such complexity suggests crop improvement opportunities to select for allelic variation in the genes affecting hormonal regulation, and (in selected crops) to augment root\uffe2\uff80\uff93shoot communication by judicious selection of rootstock\uffe2\uff80\uff93scion combinations to ameliorate abiotic stresses.miR156 is a conserved microRNA whose role and induction mechanisms under stress are poorly known. Strigolactones are phytohormones needed in shoots for drought acclimation. They promote stomatal closure ABA\uffe2\uff80\uff90dependently and independently; however, downstream effectors for the former have not been identified. Linkage between miR156 and strigolactones under stress has not been reported. We compared ABA accumulation and sensitivity as well as performances of wt and miR156\uffe2\uff80\uff90overexpressing (miR156\uffe2\uff80\uff90oe) tomato plants during drought. We also quantified miR156 levels in wt, strigolactone\uffe2\uff80\uff90depleted and strigolactone\uffe2\uff80\uff90treated plants, exposed to drought stress. Under irrigated conditions, miR156 overexpression and strigolactone treatment led to lower stomatal conductance and higher ABA sensitivity. Exogenous strigolactones were sufficient for miR156 accumulation in leaves, while endogenous strigolactones were required for miR156 induction by drought. The \uffe2\uff80\uff9cafter\uffe2\uff80\uff90effect\uffe2\uff80\uff9d of drought, by which stomata do not completely re\uffe2\uff80\uff90open after rewatering, was enhanced by both strigolactones and miR156. The transcript profiles of several miR156 targets were altered in strigolactone\uffe2\uff80\uff90depleted plants. Our results show that strigolactones act as a molecular link between drought and miR156 in tomato, and identify miR156 as a mediator of ABA\uffe2\uff80\uff90dependent effect of strigolactones on the after\uffe2\uff80\uff90effect of drought on stomata. Thus, we provide insights into both strigolactone and miR156 action on stomata.

", "keywords": ["Osmotic stress", "0301 basic medicine", "Stress-responsive microRNA", "stomata", "hormone signalling", "after-effect of drought", "abscisic acid (ABA); after-effect of drought; hormone signalling; osmotic stress; Solanum lycopersicum; stomata; stress-responsive microRNA", "Lactones", "03 medical and health sciences", "Solanum lycopersicum", "Plant Growth Regulators", "Stomata", "2. Zero hunger", "0303 health sciences", "Dehydration", "After-effect of drought", "15. Life on land", "Abscisic acid (ABA)", "Hormone signalling", "6. Clean water", "MicroRNAs", "RNA", " Plant", "13. Climate action", "Plant Stomata", "abscisic acid (ABA)", "stress-responsive microRNA", "osmotic stress", "Heterocyclic Compounds", " 3-Ring", "Abscisic Acid"]}, "links": [{"href": "https://iris.unito.it/bitstream/2318/1764369/1/Visentin%20et%20al_PCE_R2.pdf"}, {"href": "https://onlinelibrary.wiley.com/doi/pdf/10.1111/pce.13758"}, {"href": "https://doi.org/10.1111/pce.13758"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%2C%20Cell%20%26amp%3B%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/pce.13758", "name": "item", "description": "10.1111/pce.13758", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/pce.13758"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-03-30T00:00:00Z"}}, {"id": "10.1111/ppl.70252", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:19:03Z", "type": "Journal Article", "created": "2025-04-30", "title": "Differential xylem phytohormone export from dry and wet roots during partial rootzone drying is independent of shoot\u2010to\u2010root transport in soybean", "description": "Abstract

Different phytohormones can act as root\uffe2\uff80\uff90to\uffe2\uff80\uff90shoot signalling molecules in response to soil drying. Recent findings suggest that root ABA levels are predominantly leaf\uffe2\uff80\uff90sourced and not locally synthesized, thus, ABA exported from the roots in the xylem is mostly recycled from the shoot. To explain the differential root hormone accumulation observed under partial rootzone drying (PRD) that imposes distinct dry and wet parts of the root zone, we grafted \uffe2\uff80\uff9ctwo\uffe2\uff80\uff90root, one\uffe2\uff80\uff90shoot\uffe2\uff80\uff9d soybean plants to independently assess xylem export of different phytohormones from either part of the root zone. Grafts were subjected to a combination of girdling (either part, all, or none of the rootzone) and irrigation (homogenously well\uffe2\uff80\uff90watered (WW) and PRD). PRD did not increase foliar ABA but decreased stomatal conductance, attributed to decreased leaf water potential and/or increased xylem sap ABA, JA, or ACC concentrations. In contrast, the foliar ABA increments that accompanied girdling\uffe2\uff80\uff90induced stomatal closure were proportional to the root fraction to which phloem transport was interrupted. Irrespective of girdling, root ABA accumulation (and xylem ABA export from) was highest in the dry PRD rootzone, xylem jasmonic acid (JA) in the wet PRD rootzone, and xylem ACC in both rootzones of PRD plants. Thus, soil drying of the dry root zone and transient overwatering of the wet root zone enhanced ACC export in PRD plants. We conclude that root water status during PRD enhances root ABA, JA and ACC synthesis and xylem export, independent of shoot\uffe2\uff80\uff90to\uffe2\uff80\uff90root transport.

Plant roots exhibit plasticity in their branching patterns to forage efficiently for heterogeneously distributed resources, such as soil water. The xerobranching response represses lateral root formation when roots lose contact with water. Here, we show that xerobranching is regulated by radial movement of the phloem-derived hormone abscisic acid, which disrupts intercellular communication between inner and outer cell layers through plasmodesmata. Closure of these intercellular pores disrupts the inward movement of the hormone signal auxin, blocking lateral root branching. Once root tips regain contact with moisture, the abscisic acid response rapidly attenuates. Our study reveals how roots adapt their branching pattern to heterogeneous soil water conditions by linking changes in hydraulic flux with dynamic hormone redistribution.

", "keywords": ["580", "0301 basic medicine", "0303 health sciences", "Multidisciplinary", "550", "Indoleacetic Acids", "Plasmodesmata", "Arabidopsis", "Water", "Phloem", "15. Life on land", "Plant Roots", "Soil", "03 medical and health sciences", "Plant Growth Regulators", "Abscisic Acid"]}, "links": [{"href": "https://eprints.lancs.ac.uk/id/eprint/180301/1/Poonam_add3771_Main_manuscript.pdf"}, {"href": "https://doi.org/10.1126/science.add3771"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1126/science.add3771", "name": "item", "description": "10.1126/science.add3771", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1126/science.add3771"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-11-18T00:00:00Z"}}, {"id": "10234/200218", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:24:27Z", "type": "Journal Article", "created": "2022-05-08", "title": "Bi\u2010directional, long\u2010distance hormonal signalling between roots and shoots of soil water availability", "description": "Abstract

While the importance of plant water relations in determining crop response to soil water availability is difficult to over\uffe2\uff80\uff90emphasise, under many circumstances, plants maintain their leaf water status as the soil dries yet shoot gas exchange and growth is restricted. Such observations lead to development of a paradigm that root\uffe2\uff80\uff90to\uffe2\uff80\uff90shoot signals regulate shoot physiology, and a conceptual framework to test the importance of different signals such as plant hormones in these physiological processes. Nevertheless, shoot\uffe2\uff80\uff90to\uffe2\uff80\uff90root (hormonal) signalling also plays an important role in regulating root growth and function and may dominate when larger quantities of a hormone are produced in the shoots than the roots. Here, we review the evidence for acropetal and basipetal transport of three different plant hormones (abscisic acid, jasmonates, strigolactones) that have antitranspirant effects, to indicate the origin and action of these signalling systems. The physiological importance of each transport pathway likely depends on the specific environmental conditions the plant is exposed to, specifically whether the roots or shoots are the first to lose turgor when exposed to drying soil or elevated atmospheric demand, respectively. All three hormones can interact to influence each other's synthesis, degradation and intracellular signalling to augment or attenuate their physiological impacts, highlighting the complexity of unravelling these signalling systems. Nevertheless, such complexity suggests crop improvement opportunities to select for allelic variation in the genes affecting hormonal regulation, and (in selected crops) to augment root\uffe2\uff80\uff93shoot communication by judicious selection of rootstock\uffe2\uff80\uff93scion combinations to ameliorate abiotic stresses.

Plant roots exhibit plasticity in their branching patterns to forage efficiently for heterogeneously distributed resources, such as soil water. The xerobranching response represses lateral root formation when roots lose contact with water. Here, we show that xerobranching is regulated by radial movement of the phloem-derived hormone abscisic acid, which disrupts intercellular communication between inner and outer cell layers through plasmodesmata. Closure of these intercellular pores disrupts the inward movement of the hormone signal auxin, blocking lateral root branching. Once root tips regain contact with moisture, the abscisic acid response rapidly attenuates. Our study reveals how roots adapt their branching pattern to heterogeneous soil water conditions by linking changes in hydraulic flux with dynamic hormone redistribution.

", "keywords": ["580", "0301 basic medicine", "0303 health sciences", "Multidisciplinary", "550", "Indoleacetic Acids", "Plasmodesmata", "Arabidopsis", "Water", "Phloem", "15. Life on land", "Plant Roots", "Soil", "03 medical and health sciences", "Plant Growth Regulators", "Abscisic Acid"]}, "links": [{"href": "https://eprints.lancs.ac.uk/id/eprint/180301/1/Poonam_add3771_Main_manuscript.pdf"}, {"href": "https://doi.org/2078.1/267255"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "2078.1/267255", "name": "item", "description": "2078.1/267255", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2078.1/267255"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-11-18T00:00:00Z"}}, {"id": "2808068377", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:25:39Z", "type": "Journal Article", "created": "2018-06-15", "title": "Out of Shape During Stress: A Key Role for Auxin", "description": "In most abiotic stress conditions, including salinity and water deficit, the developmental plasticity of the plant root is regulated by the phytohormone auxin. Changes in auxin concentration are often attributed to changes in shoot-derived long-distance auxin flow. However, recent evidence suggests important contributions by short-distance auxin transport from local storage and local auxin biosynthesis, conjugation, and oxidation during abiotic stress. We discuss here current knowledge on long-distance auxin transport in stress responses, and subsequently debate how short-distance auxin transport and indole-3-acetic acid (IAA) metabolism play a role in influencing eventual auxin accumulation and signaling patterns. Our analysis stresses the importance of considering all these components together and highlights the use of mathematical modeling for predictions of plant physiological responses.", "keywords": ["0301 basic medicine", "0303 health sciences", "abiotic stress", "Indoleacetic Acids", "auxin transport", "mathematical modeling", "Biological Transport", "IAA homeostasis", "Models", " Theoretical", "Plants", "Plant Roots", "Article", "03 medical and health sciences", "Plant Growth Regulators", "root phenotypic plasticity", "Stress", " Physiological", "auxin", "Plant Physiological Phenomena", "Signal Transduction"]}, "links": [{"href": "https://doi.org/2808068377"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Trends%20in%20Plant%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "2808068377", "name": "item", "description": "2808068377", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2808068377"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-09-01T00:00:00Z"}}, {"id": "3080281680", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-05-25T16:25:54Z", "type": "Journal Article", "created": "2020-08-21", "title": "No Home without Hormones: How Plant Hormones Control Legume Nodule Organogenesis", "description": "The establishment of symbiotic nitrogen fixation requires the coordination of both nodule development and infection events. Despite the evolution of a variety of anatomical structures, nodule organs serve\u00a0a common purpose in establishing a localized area that facilitates efficient nitrogen fixation. As in all plant developmental processes, the establishment of a new nodule organ is regulated by plant hormones. During nodule initiation, regulation of plant hormone signaling is one of the major targets of symbiotic signaling. We review the role of major developmental hormones in the initiation of the nodule organ and argue that the manipulation of plant hormones is a key requirement for engineering nitrogen fixation in non-legumes as the basis for improved food security and sustainability.", "keywords": ["0301 basic medicine", "2. Zero hunger", "0303 health sciences", "Cytokinins", "hormones", "nodule", "Fabaceae", "legume", "Review Article", "Ethylenes", "Plant Root Nodulation", "symbiosis", "Gibberellins", "03 medical and health sciences", "Plant Growth Regulators", "nitrogen fixation", "Nitrogen Fixation", "Symbiosis"]}, "links": [{"href": "https://doi.org/3080281680"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20Communications", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "3080281680", "name": "item", "description": "3080281680", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/3080281680"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-09-01T00:00:00Z"}}, {"id": "37379661", "type": "Feature", "geometry": null, "properties": {"license": "Closed Access", "updated": "2026-05-25T16:26:15Z", "type": "Journal Article", "created": "2023-06-26", "title": "Turning up the volume: How root branching adaptive responses aid water foraging", "description": "Access to water is critical for all forms of life. Plants primarily access water through their roots. Root traits such as branching are highly sensitive to water availability, enabling plants to adapt their root architecture to match soil moisture distribution. Lateral root adaptive responses hydropatterning and xerobranching ensure new branches only form when roots are in direct contact with moist soil. Root traits are also strongly influenced by atmospheric humidity, where a rapid drop leads to a promotion of root growth and branching. The plant hormones auxin and/or abscisic acid (ABA) play key roles in regulating these adaptive responses. We discuss how these signals are part of a novel 'water-sensing' mechanism that couples hormone movement with hydrodynamics to orchestrate root branching responses.", "keywords": ["2. Zero hunger", "Soil", "Plant Growth Regulators", "Water", "15. Life on land", "Plant Roots", "6. Clean water", "Abscisic Acid"]}, "links": [{"href": "https://doi.org/37379661"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Current%20Opinion%20in%20Plant%20Biology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "37379661", "name": "item", "description": "37379661", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/37379661"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-10-01T00:00:00Z"}}, {"id": "40302147", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:26:23Z", "type": "Journal Article", "created": "2025-04-30", "title": "Differential xylem phytohormone export from dry and wet roots during partial rootzone drying is independent of shoot\u2010to\u2010root transport in soybean", "description": "Abstract

Different phytohormones can act as root\uffe2\uff80\uff90to\uffe2\uff80\uff90shoot signalling molecules in response to soil drying. Recent findings suggest that root ABA levels are predominantly leaf\uffe2\uff80\uff90sourced and not locally synthesized, thus, ABA exported from the roots in the xylem is mostly recycled from the shoot. To explain the differential root hormone accumulation observed under partial rootzone drying (PRD) that imposes distinct dry and wet parts of the root zone, we grafted \uffe2\uff80\uff9ctwo\uffe2\uff80\uff90root, one\uffe2\uff80\uff90shoot\uffe2\uff80\uff9d soybean plants to independently assess xylem export of different phytohormones from either part of the root zone. Grafts were subjected to a combination of girdling (either part, all, or none of the rootzone) and irrigation (homogenously well\uffe2\uff80\uff90watered (WW) and PRD). PRD did not increase foliar ABA but decreased stomatal conductance, attributed to decreased leaf water potential and/or increased xylem sap ABA, JA, or ACC concentrations. In contrast, the foliar ABA increments that accompanied girdling\uffe2\uff80\uff90induced stomatal closure were proportional to the root fraction to which phloem transport was interrupted. Irrespective of girdling, root ABA accumulation (and xylem ABA export from) was highest in the dry PRD rootzone, xylem jasmonic acid (JA) in the wet PRD rootzone, and xylem ACC in both rootzones of PRD plants. Thus, soil drying of the dry root zone and transient overwatering of the wet root zone enhanced ACC export in PRD plants. We conclude that root water status during PRD enhances root ABA, JA and ACC synthesis and xylem export, independent of shoot\uffe2\uff80\uff90to\uffe2\uff80\uff90root transport.During nutrient scarcity, plants can adapt their developmental strategy to maximize their chance of survival. Such plasticity in development is underpinned by hormonal regulation, which mediates the relationship between environmental cues and developmental outputs. In legumes, endosymbiosis with nitrogen-fixing bacteria (rhizobia) is a key adaptation for supplying the plant with nitrogen in the form of ammonium. Rhizobia are housed in lateral root-derived organs termed nodules that maintain an environment conducive to Nitrogenase in these bacteria. Several phytohormones are important for regulating the formation of nodules, with both positive and negative roles proposed for gibberellin (GA). In this study, we determine the cellular location and function of bioactive GA during nodule organogenesis using a genetically encoded second-generation GA biosensor, GIBBERELLIN PERCEPTION SENSOR 2 in Medicago truncatula. We find endogenous bioactive GA accumulates locally at the site of nodule primordia, increasing dramatically in the cortical cell layers, persisting through cell divisions, and maintaining accumulation in the mature nodule meristem. We show, through misexpression of GA-catabolic enzymes that suppress GA accumulation, that GA acts as a positive regulator of nodule growth and development. Furthermore, increasing or decreasing GA through perturbation of biosynthesis gene expression can increase or decrease the size of nodules, respectively. This is unique from lateral root formation, a developmental program that shares common organogenesis regulators. We link GA to a wider gene regulatory program by showing that nodule-identity genes induce and sustain GA accumulation necessary for proper nodule formation. Soil salinity presents a dual challenge for plants, involving both osmotic and ionic stress. In response, plants deploy distinct yet interconnected mechanisms to cope with these facets of salinity stress. In this investigation, we observed a substantial overlap in the salt (NaCl)-induced transcriptional responses of Arabidopsis roots with those triggered by osmotic stress or the plant stress hormone abscisic acid (ABA), as anticipated. Notably, a specific cluster of genes responded uniquely to sodium (Na + ) ions and are not regulated by the known monovalent cation sensing mechanism MOCA1 . Surprisingly, expression of sodium-induced genes exhibited a negative correlation with the ABA response and preceded the activation of genes induced by the osmotic stress component of salt. Elevated exogenous ABA levels resulted in the complete abolition of sodium-induced responses. Consistently, the ABA insensitive snrk2.2/2.3 double mutant displayed prolonged sodium-induced gene expression, coupled with increased root cell damage and root swelling under high salinity conditions. Moreover, ABA biosynthesis and signaling mutants were unable to redirect root growth to avoid high sodium concentrations and had increased sodium accumulation in the shoot. In summary, our findings unveil an unexpected and pivotal role for ABA signaling in mitigating cellular damage induced by salinity stress and modulating sodium-induced responses in plant roots. Different phytohormones can act as root\uffe2\uff80\uff90to\uffe2\uff80\uff90shoot signalling molecules in response to soil drying. Recent findings suggest that root ABA levels are predominantly leaf\uffe2\uff80\uff90sourced and not locally synthesized, thus, ABA exported from the roots in the xylem is mostly recycled from the shoot. To explain the differential root hormone accumulation observed under partial rootzone drying (PRD) that imposes distinct dry and wet parts of the root zone, we grafted \uffe2\uff80\uff9ctwo\uffe2\uff80\uff90root, one\uffe2\uff80\uff90shoot\uffe2\uff80\uff9d soybean plants to independently assess xylem export of different phytohormones from either part of the root zone. Grafts were subjected to a combination of girdling (either part, all, or none of the rootzone) and irrigation (homogenously well\uffe2\uff80\uff90watered (WW) and PRD). PRD did not increase foliar ABA but decreased stomatal conductance, attributed to decreased leaf water potential and/or increased xylem sap ABA, JA, or ACC concentrations. In contrast, the foliar ABA increments that accompanied girdling\uffe2\uff80\uff90induced stomatal closure were proportional to the root fraction to which phloem transport was interrupted. Irrespective of girdling, root ABA accumulation (and xylem ABA export from) was highest in the dry PRD rootzone, xylem jasmonic acid (JA) in the wet PRD rootzone, and xylem ACC in both rootzones of PRD plants. Thus, soil drying of the dry root zone and transient overwatering of the wet root zone enhanced ACC export in PRD plants. We conclude that root water status during PRD enhances root ABA, JA and ACC synthesis and xylem export, independent of shoot\uffe2\uff80\uff90to\uffe2\uff80\uff90root transport.