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Influence of nitrogen on accumulation of isosojagol (a newly detected coumestan in soybean) and associated isoflavonoids in roots and nodules of mycorrhizal and non‐mycorrhizal soybean
Author(s) -
MORANDI D.,
QUERE J. L.
Publication year - 1991
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1991.tb00946.x
Subject(s) - daidzein , coumestrol , symbiosis , root nodule , glycine , biology , nitrogen , botany , fungus , mycorrhiza , nodule (geology) , genistein , chemistry , bacteria , biochemistry , amino acid , paleontology , genetics , organic chemistry , endocrinology
summary A newly detected coumestan was found to accumulate in roots of soybean ( Glycine max. L., var. Amsoy 71), after infection by a vesicular arbuscular (VA) mycorrhizal fungus ( Glomus intraradices , Schenck & Smith) and very strongly in nodules after nitrogen application. This coumestan was identified as a 3,9 dihydroxy 10 (γ,γ‐dimethylallyl) coumestan called isosojagol. Three other associated isoflavonoids were analysed: glyceollin I, coumestrol and daidzein. Nitrogen application decreased the concentration of these three compounds in roots, particularly in non‐mycorrhizal soybeans, whilst their concentration in nodules was not significantly affected. VA mycorrhizal infection decreased the accumulation of all the compounds analysed in nodules, although the fungus was never observed inside the nodule, but increased their accumulation in roots.