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A physiological study on the salt-tolerant mutant of rice

Zhang Hui, Zhou Junma, Guo Yan, Chen Shouyi

Laboratory of Plant Biotechnology, Institute of Genetics, The Chinese Academy of Sciences. Beijing 100101

Abstract

The salt-tolerant mutant rice (Oryza sativa subsp. japonica) M-20 and its original line 77-170 were selected for investigation of their physiological responses to salt stress in a hydroponic system. The seedlings of the line M-20 exhibited less growth inhibition, better survival ability and less membrane damage under salinized conditions in comparison with that of the line 77-170. These differences were associated with maintenance of significantly higher leaf water content in M-20 than that in 77-170. When the soil-grown rice seedlings were irrigated with saline water, the growing and matured leaves of the mutant line showed a less and later increase in endogenous ABA contect than that of its original line. The increase of the level of free proline in the mutant line occurred later but was higher. The possible mechanisms of salt tolerance of the mutant are discussed.

Key words: Rice;Salt tolerant mutunt;Salt stress;Salt tolerance

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Citing This Article：

Zhang Hui, Zhou Junma, Guo Yan, Chen Shouyi. A physiological study on the salt-tolerant mutant of rice. Acta Physiol Sin 1997; 49 (2): (in Chinese with English abstract).