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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
Article first published online: 28 APR 2006
DOI: 10.1111/j.1469-8137.1991.tb00946.x
1469-8137/asset/cover.gif?v=1&s=570a3a280b205b8cd6b43e7a8ee052e7536c7006 "New Phytologist")
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How to Cite
MORANDI, D. and LE QUERE, J. L. (1991), 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. New Phytologist, 117: 75–79. doi: 10.1111/j.1469-8137.1991.tb00946.x
Publication History
- Issue published online: 28 APR 2006
- Article first published online: 28 APR 2006
- (Received 4 May 1990; accepted 25 September 1990)
- Abstract
- References
- Cited By
Keywords:
- Mycorrhiza;
- nodules;
- nitrogen;
- isoflavonoids;
- soybean
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.