IMPACT4SOIL OpenAire HAL INRAE Bielefeld Academic Search Engine (BASE) Hyper Article en Ligne - Sciences de l'Homme et de la Société Horizon / Pleins textes Crossref HAL Descartes Agritrop Microsoft Academic Graph Plant and Soil Open Access 2016-06-14 2020-05-27 Positive below-ground interactions (facilitation) should be more pronounced when resources limit crop growth, according to the stress-gradient hypothesis. Our aim was to test this hypothesis for intercropped durum wheat and faba bean along a P-fertilizer gradient. A field experiment was conducted in a long-term P-fertilizer trial with three rates of P-fertilization (No, Low and High P). Microbial biomass was assessed by chloroform fumigation-extraction. Quantitative PCR was applied to evaluate the abundance of relevant microbial groups. Phosphorus availability and microbial biomass systematically increased in the rhizosphere compared to bulk soil. P-fertilization resulted in higher abundance of targeted bacterial phyla, whole bacterial and fungal communities, and depressed mycorrhizal colonization of durum wheat, but not faba bean. Microbial biomass carbon significantly increased in the rhizosphere only in P-fertilized treatments, pointing to P limitation of microbial communities. Intercropping yielded a significant effect on rhizosphere microbial properties only at High P. Microbial biomass P increased in the rhizosphere of intercropped faba bean only at No P level, and was thus the sole finding supporting the stress-gradient hypothesis. P-fertilization was the main driver of microbial communities in this field trial, and P-fertilizer application modulated the species-specific effect in the intercrop. Plant performance did not validate the stress-gradient hypothesis as positive plant-plant interactions occurred regardless of the level of P-fertilization. [SDE] Environmental Sciences engrais phosphaté F08 - Systèmes et modes de culture [SDV]Life Sciences [q-bio] F62 - Physiologie végétale - Croissance et développement mycorhization Triticum turgidum 630 fertilisation [SHS]Humanities and Social Sciences http://aims.fao.org/aos/agrovoc/c_37554 http://aims.fao.org/aos/agrovoc/c_5800 http://aims.fao.org/aos/agrovoc/c_10795 http://aims.fao.org/aos/agrovoc/c_24199 2. Zero hunger Mycorrhizal colonization 04 agricultural and veterinary sciences Vicia faba [SDV] Life Sciences [q-bio] fertilité du sol http://aims.fao.org/aos/agrovoc/c_6569 Rhizosphere Long-term fertilization [SDE]Environmental Sciences [SHS] Humanities and Social Sciences Intercrop http://aims.fao.org/aos/agrovoc/c_8220 rhizosphère http://aims.fao.org/aos/agrovoc/c_4819 http://aims.fao.org/aos/agrovoc/c_7170 plante céréalière flore microbienne disponibilité nutriments (sol) http://aims.fao.org/aos/agrovoc/c_25512 modèle mathématique http://aims.fao.org/aos/agrovoc/c_36163 Microbial community http://aims.fao.org/aos/agrovoc/c_3081 phosphate P availability P34 - Biologie du sol 15. Life on land http://aims.fao.org/aos/agrovoc/c_16367 plante légumière http://aims.fao.org/aos/agrovoc/c_7958 628 http://aims.fao.org/aos/agrovoc/c_3910 http://aims.fao.org/aos/agrovoc/c_35986 0401 agriculture, forestry, and fisheries culture intercalaire http://aims.fao.org/aos/agrovoc/c_8165 F04 - Fertilisation Xiaoyan Tang, Xiaoyan Tang, Philippe Hinsinger, Laetitia Bernard, Agnès Robin, Etienne-Pascal Journet, Sarah Placella, Eric Justes, Florent Dayde, 2016-06-14 journalpaper Positive below-ground interactions (facilitation) should be more pronounced when resources limit crop growth, according to the stress-gradient hypothesis. Our aim was to test this hypothesis for intercropped durum wheat and faba bean along a P-fertilizer gradient. A field experiment was conducted in a long-term P-fertilizer trial with three rates of P-fertilization (No, Low and High P). Microbial biomass was assessed by chloroform fumigation-extraction. Quantitative PCR was applied to evaluate the abundance of relevant microbial groups. Phosphorus availability and microbial biomass systematically increased in the rhizosphere compared to bulk soil. P-fertilization resulted in higher abundance of targeted bacterial phyla, whole bacterial and fungal communities, and depressed mycorrhizal colonization of durum wheat, but not faba bean. Microbial biomass carbon significantly increased in the rhizosphere only in P-fertilized treatments, pointing to P limitation of microbial communities. Intercropping yielded a significant effect on rhizosphere microbial properties only at High P. Microbial biomass P increased in the rhizosphere of intercropped faba bean only at No P level, and was thus the sole finding supporting the stress-gradient hypothesis. P-fertilization was the main driver of microbial communities in this field trial, and P-fertilizer application modulated the species-specific effect in the intercrop. Plant performance did not validate the stress-gradient hypothesis as positive plant-plant interactions occurred regardless of the level of P-fertilization. Phosphorus Availability And Microbial Community In The Rhizosphere Of Intercropped Cereal And Legume Along A P-Fertilizer Gradient 10.1007/s11104-016-2949-3 https://doi.org/10.1007/s11104-016-2949-3