Effect of cadmium stress on nitrogen metabolism in nodules and roots of soybean plants

Functional Plant Biology : FPB
Karina B BalestrasseMaría L Tomaro

Abstract

The nitrogen metabolism of soybean (Glycine max L.) nodules and roots was studied in plants subjected to two different concentrations (50 and 200 μM) of CdCl2. Nitrogenase activity was decreased in nodules treated with 200 μM Cd2+. In 50 μM Cd2+-treated plants, NH4+ content showed similar values to controls in nodules, but increased by 55% in roots. However, after treatment with 200 μM Cd2+, NH4+ levels increased in both tissues. Glutamate (Glu) and protein contents remained unaltered in nodules treated with 50 μM Cd2+, while at the higher Cd2+ concentration both were decreased. Nevertheless, polyamine content was increased at the two Cd2+ concentrations. In roots, Glu, polyamine and protein levels were significantly diminished at 50 and 200 μM CdCl2. For nitrogen-assimilation enzymes, glutamate dehydrogenase activity was moderately increased in nodules and roots following the lower Cd2+ treatment, though at the higher Cd2+ concentration root enzyme activity returned to control levels. An impressive increase in enzyme activity was found in nodules. In roots, the glutamine synthetase / glutamate synthase pathway was decreased at the two Cd2+ concentrations, though in nodules it was diminished only at 200 μM Cd2+. No changes in p...Continue Reading

Citations

Jun 18, 2011·Biological Trace Element Research·Vijay Pratap SinghDevendra Kumar Chauhan
Jan 18, 2011·Biological Trace Element Research·Muhammad Yasin AshrafM Sajid Aqeel Ahmad
Jul 29, 2011·Biological Trace Element Research·Savita GangwarJagat Narayan Maurya
Nov 20, 2008·Journal of Integrative Plant Biology·Giovanni DalCorsoAntonella Furini
Mar 15, 2005·Free Radical Research·Karina B BalestrasseMaría L Tomaro
Jan 16, 2021·Ecotoxicology and Environmental Safety·Fasih Ullah HaiderMuhammad Farooq
Nov 23, 2020·Environmental Science and Pollution Research International·Senlin YangLianghua Chen

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