Effects of PEG stress on physiological characteristics of Calligonum mongolicum in different geographical provenance

Abstract

Abstract: To simulate the solution drought stress condition with different concentrations PEG-6000, we studied the effects of drought-resistant of physiological characteristics in Calligonum mongolicum seedlings from different geographical provenance in Gansu province. The results indicated that content of Pro increased with the stress time prolong, content of SS(soluble sugar) raised first, then declined, and increased continually later, content of MDA(malondehyde) increased first and then decreased, SOD(superoxide dismutase) activity presented “M” tendency, POD(peroxide enzyme) activity increased first and then decreased. The seedlings of three geographical provenances generally presented a similar tendency under different concentrations and long-term stress while with the significant difference(P<0.05).The increasing range of Pro content was Wuwei>Jiuquan>Zhangye, soluble sugar content was Jiuquan>Zhangye>Wuwei, MDA content was Wuwei>Zhangye>Jiuquan, SOD activity was Wuwei>Zhangye>Jiuquan, POD activity was Jiuquan>Wuwei>Zhangye. There existed difference of drought resistance mechanism of C. mongolicum,but the adjustment of protection enzymes was an important physiological reaction to the environment adaptability.

CLC Number:

QIU Zhen-jing, LI Yi, CHONG Pei-fang. Effects of PEG stress on physiological characteristics of Calligonum mongolicum in different geographical provenance[J]. Acta Prataculturae Sinica, 2011, 20(3): 108-114.

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