Physiological responses of Nitraria tangutorum from different geographic provenances under osmotic stress

Abstract

Abstract: Nitraria tangutorum was taken from three geographic provenances (Wuwei, Zhangye and Jiuquan) and several physiological characteristics were measured under PEG stress. Under PEG osmotic stress, the contents of malondialdehyde (MDA), proline (Pro), soluble sugar (SS) and soluble protein (SP), and superoxide dismutase (SOD) activity increased, while the relative water content (RWC) reduced and catalase (CAT) activity inbitially increased but then decreased. There were significant differences (P<0.05) between PEG treatment and the control in most indexes, but not between SOD activity and the control. Correlation analysis showed that there were highly significant correlations of MDA content with SOD activity and with the contents of Pro, SP, and SS. There were highly significant negative correlations of RWC with SOD activity and with the contents of Pro, SP, SS and MDA. There were highly significant or significant correlations between SOD activity and the contents of Pro, SS and SP. Principal component analysis showed that the first principal components of N. tangutorum osmotic stress were RWC and the contents of Pro, SS, SP and MDA while the second and third were SOD and CAT, respectively. Under PEG stress, drought tolerances of plants from the three geographic provenances were in the sequence: Jiuquan>Zhangye>Wuwei.

CLC Number:

Q945.78

GAO Ming, LI Yi, CHONG Pei-fang, SU Shi-ping. Physiological responses of Nitraria tangutorum from different geographic provenances under osmotic stress[J]. Acta Prataculturae Sinica, 2011, 20(3): 99-107.

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