Effect of water deficit on symbiotic nitrogen fixation in soybean glycine max

Svaradzh, K.; Shishchenko, S.V.; Kozlova, G.I.; Andreeva, I.N.; Zhiznevskaya, G.Ya

Fiziologiya Rastenii 31(5): 833-840


ISSN/ISBN: 0038-5719
Accession: 005282600

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Acetylene-reducing activity and H2 and CO2 evolution were estimated by gas-chromatographic technique in the root nodules [due to Rhizobium japonicum] excised from soybean plants 1, 2, 3, or 5 days after cessation of watering. Acetylene-reducing activity and CO2 and H2 evolution were declining in parallel with increasing water deficit, H2 evolution decreasing mostly drastically. Concurrently, the amount of green and yellow pigments and rates of photosynthesis and of respiration in soybean levels were also declining, but those changes in leaves were less pronounced than the suppression of N2 fixation in root nodules. Soybean leaves were more tolerant to short-term water shortage and after 2 days following cessation of watering they neither wilted nor abscised.