Effects of salt stress on photosynthetic performance and protective enzyme activities of corn at seedling stage

doi:10.14088/j.cnki.issn0439-8114.2022.15.002

Abstract

Abstract: Using different concentrations of NaCl （0, 50, 100 and 150 mmol/L） to simulate salt stress, the indexes of photosynthetic performance and protective enzyme activity were measured. Based on the salt tolerance coefficient of each index, the salt tolerance of the main corn varieties in Shangluo was conprehensively evaluated by using the weighted membership function method. The results showed that,with the increase of salt comcentration, the net photosynthetic rate （P_n）, stomatal conductance （G_S） and transpiration rate （T_r） showed a decreasing trend; the intercellular CO₂ concentration （C_i） showed an increasing trend; SOD, POD and CAT activity increased first and then decreased. Based on the comprehensive D value, the salt tolerance of the tested varieties at seedling stage was Denghai 11> Zhengda 658> Qinxin 1708> Ansen 7> Wanrui 6> Zhaoyu951. The research results could provide reference for the selection of Shangluo corn varieties.

Key words: corn, seedling stage, photosynthetic performance, protective enzyme activity, salt tolerance

CLC Number:

Q945.78

ZHANG Jun, GE Dan, LIU Yu, SHEN Xing-yu, LI Tian. Effects of salt stress on photosynthetic performance and protective enzyme activities of corn at seedling stage[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(15): 10-14.

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