Analysis of the effect of nitrate on symbiosis between soyabeans (Glycine max (L.) Merr.) and Rhizobium japonicum with or without inducible nitrate reductase

Champigny, M.L.; Quy, L.V.; Moyse, A.

Comptes Rendus de l' Academie des Sciences, III Sciences de la Vie 300(1): 19-24


Accession: 001299749

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8-day-old seedlings of soyabeans cv. Amsoy 71 and Mapple Arrow were inoculated with R. japonicum strain (a) USDA 311 b 138 or (b) CB 1809, with and without inducible nitrate reductase, resp., and given nutrient solution containing 0.5, 2.0 or 5.0 meq nitrate immediately or at 35-40 days after germination. Nodulation and acetylene reductase activity were reduced in plants inoculated with (a) and given 2 meq nitrate, but nitrate reductase activity of the bacteria was increased. Strain (b) was less sensitive to nitrate and inhibition of symbiosis occurred only after 10 days of treatment with 5 meq nitrate, when nitrate reductase activity was also reduced. The role of inducible nitrate reductase in inhibition of symbiosis by nitrate is considered.