Magnesium is the metal at the center of all types of chlorophyll and is thus crucial to photosynthesis. When an element is involved in a biosynthetic pathway its isotopes are fractionated based on the difference of vibrational frequency between the different molecules. With the technical advance of multi-collectors plasma-mass-spectrometry and improvement in analytical precision, it has recently been found that two types of chlorophylls (a and b) are isotopically distinct. These results have very significant implications with regards to the use of Mg isotopes to understand the biosynthesis of chlorophyll. Here we present theoretical constraints on the origin of these isotopic fractionations through ab initio calculations. We present the fractionation factor for chlorphyll a, b, d, and f. We show that the natural isotopic variations among chlorophyll a and b are well explained by isotopic fractionation under equilibrium, which implies exchanges of Mg during the chlorophyll cycle. We predict that chlorophyll d and f should be isotopically fractionated compared to chlorophyll a and that this could be used in the future to understand the biosynthesis of these molecules.
", "keywords": ["Chlorophyll", "0301 basic medicine", "0303 health sciences", "RELEVANT", "Molecular Structure", "PHOTOSYNTHESIS", "Science", "Q", "POTENTIALS", "R", "Chemical Fractionation", "Fe", "Article", "3. Good health", "[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry", "[CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry", "03 medical and health sciences", "Isotopes", "Zn", "Medicine", "PLANTS", "Magnesium", "[SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry", " Molecular Biology/Biochemistry [q-bio.BM]", "GEOCHEMISTRY", "[SDV.BBM.BC] Life Sciences [q-bio]/Biochemistry", " Molecular Biology/Biochemistry [q-bio.BM]"], "contacts": [{"organization": "Fr\u00e9d\u00e9ric Moynier, Fr\u00e9d\u00e9ric Moynier, Toshiyuki Fujii,", "roles": ["creator"]}]}, "links": [{"href": "https://www.nature.com/articles/s41598-017-07305-6.pdf"}, {"href": "https://doi.org/10.1038/s41598-017-07305-6"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Scientific%20Reports", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/s41598-017-07305-6", "name": "item", "description": "10.1038/s41598-017-07305-6", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/s41598-017-07305-6"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-08-01T00:00:00Z"}}, {"id": "10.5194/bg-3-571-2006", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:21:09Z", "type": "Journal Article", "created": "2010-04-29", "description": "Abstract. Eddy covariance technique to measure CO2, water and energy fluxes between biosphere and atmosphere is widely spread and used in various regional networks. Currently more than 250 eddy covariance sites are active around the world measuring carbon exchange at high temporal resolution for different biomes and climatic conditions. In this paper a new standardized set of corrections is introduced and the uncertainties associated with these corrections are assessed for eight different forest sites in Europe with a total of 12 yearly datasets. The uncertainties introduced on the two components GPP (Gross Primary Production) and TER (Terrestrial Ecosystem Respiration) are also discussed and a quantitative analysis presented. Through a factorial analysis we find that generally, uncertainties by different corrections are additive without interactions and that the heuristic u*-correction introduces the largest uncertainty. The results show that a standardized data processing is needed for an effective comparison across biomes and for underpinning inter-annual variability. The methodology presented in this paper has also been integrated in the European database of the eddy covariance measurements.
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