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  1. Antagonistic relationship between selenate and sulfate uptake in onion (Allium cepa) : Implications for the production of organosulfur and organoselenium compounds in plants.

    Article - En anglais

    The relationship between S and Se uptake in onion plants was investigated in solution culture.

    In the absence of Se, plant S concentrations ranged from 0.6 to 1.45% at S solution culture levels of 0.8 mol m-3 (standard nutrient solution) and 14.8 mol m-3SO4 (gypsum saturated), respectively.

    Increasing levels from 1 to 8 g m-3SeO42-Se did not increase Se content beyond 158 ± 19 mug/plant, although plant concentrations ranged from 200 to over 1000 mug of Se/g of dry matter.

    At a constant Se level, increasing S in solution culture reduced plant dry matter Se concentration by 80%. When the antagonistic relationship between these two elements is expressed as a molar ratio, S/Se in plant dry matter is nearly identical to S/Se in solution culture.

    These data suggest that S must be supplied at relatively low levels to produce high concentrations of plant Se.

    Mots-clés Pascal : Antagonisme, Approvisionnement, Captation, Effet intercomposé, Effet interélément, Fertilisation minérale, Allium cepa, Liliaceae, Monocotyledones, Angiospermae, Spermatophyta, Oignon, Séléniate, Sélénium, Sélénium Composé organique, Soufre, Soufre Composé organique, Sulfate, Culture hydroponique, Chimie biominérale, Nutrition, Prévention, Qualité production, Science alimentaire, Valeur nutritive, Plante légumière, Elément minéral, Légume, Oligoélément, Agent chimique prophylactique, Fertilisation soufrée, Nutraceutique

    Mots-clés Pascal anglais : Antagonism, Supply, Uptake, Intercompound effect, Interelement effect, Mineral fertilization, Allium cepa, Liliaceae, Monocotyledones, Angiospermae, Spermatophyta, Onion, Selenates, Selenium, Selenium Organic compounds, Sulfur, Sulfur Organic compounds, Sulfates, Hydroponic cultivation, Bioinorganic chemistry, Nutrition, Prevention, Production quality, Food science, Nutritive value, Vegetable crop, Inorganic element, Vegetable, Trace element (nutrient), chemopreventers, Sulfur fertilization, Nutraceutical

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 97-0297845

    Code Inist : 002A32C02E. Création : 15/07/1997.