Effect of Water Stress upon the Activities of Protective Enzyme System and the Structures of Membrane System in Maize

doi:10.3321/j.issn:1000-7091.1995.02.009

Abstract

Abstract: When exposed to water stress induced by PEG, the activity of SOD in the maize seedlings with different drought-resistance lowered at the beginning and then increased and then lowered again; the activity of CAT went up (or almost did not change) at the beginning and then lowered in the strong drought-resistance genotypes but lowered straight in the weak droughtresistance genotypes; the activity of POD lowered apparently in all genotypes. At the sametime, the permeability of plasma membrane increased; the super-microstructures of chloroplasts and mitochondria in the leaves were damaged, and the damaged degree was lighter in the strong drought-resistance genotypes than that in the weak drought-resistance genotypes. The activities of SOD and CAT were negatively related to the damaged degree of plasmalemrna and chloroplasts and mitochondria membrane systems, but positively related to the drought-resistant properties of the genotypes, thus may be used as the biochernical appraisal indexes of drought-resistance of matte. However, the correlation between POD activity and the damaged degree of the membrane systems and the correlation between POD activity and the drought-resistant properties of the genotypes were not apparent.

Key words: Water stress, Maize, Protective enzyme system, Membrane system

CLC Number:

S513.043

Wang Maoyan, Shao Shiqin, Zhang Jianhua, Geng Qinghan. Effect of Water Stress upon the Activities of Protective Enzyme System and the Structures of Membrane System in Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1995, 10(2): 43-49. doi: 10.3321/j.issn:1000-7091.1995.02.009.

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