J Integr Plant Biol. ›› 2004, Vol. 46 ›› Issue (8): 921-927.

• Research Articles • Previous Articles     Next Articles

Effect of Salt Stress on Ammonium Assimilation Enzymes of the Roots of Rice (Oryza sativa) Cultivars Differing in Salinity Resistance

ZHOU Wei, SUN Qing-Jie, ZHANG Chu-Fu, YUAN Yong-Ze, ZHANG Ji, LU Bin-Bin   


Effects of NaCl-stress on ammonia assimilation enzymes and the related parameters were determined in the roots of three rice (Oryza sativa L.) cultivars differing in salt tolerance. The results showed that the activities of glutamine synthetase (GS) and NADH-dependent glutamate synthase (NADH-GOGAT), as well as the levels of soluble protein decreased under high concentration salt. The influence extent was in accordance with Zao-hua 2 (salt-sensitive), Jin-zhu 1 (normal cultivar) and Jin-dao 779 (salt-resistant), which was consistent with their salt-tolerance. Nevertheless, under the stress of high salt concentration, NADH-dependent glutamate dehydrogenase (NADH-GDH) activity of Zao-hua 2 and Jin-zhu 1 was induced significantly, but that of Jin-dao 779 did not increase remarkably. The salt stress led to the accumulation of total soluble sugar (TSS) in the root of Jin-zhu 1 and Jin-dao 779 in different degree. The level of TSS in Zao-hua 2 changed with different NaCl concentrations. Among the cultivars observed, content of proline increased in different degree, but under high salt concentrations, it had a more marked rise in the roots of salt-sensitive cultivars.

Key words: glutamine synthetase (GS), glutamate synthase (GOGAT), glutamate dehydrogenase (GDH), rice, salt stress

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