Physiological Identification and Comprehensive Evaluation of Drought Resistance of Different Maize Varieties
A total of 42 maize cultivars were selected as the test materials and treated with normal irrigation,moderate and severe drought stress in the experimental base of Turpan Institute of Agricultural Sciences,Xinjiang Academy of Agricultural Sciences.The changes of chlorophyll(Chi)content,malondialdehyde(MDA)content,proline(Pro)content,the activities of superoxide dismutase(SOD),catalase(CAT)and peroxidase(POD)in ear leaf of maize at grain filling stage,and also grain yield were measured.The grey correlation analysis,drought resistance index(DI),drought resistance evaluation values(D-value),weighted drought resistance index(WDI-value)and cluster analysis were used to screen physiological indexes closely related to drought resistance,and the drought resistance of different maize varieties was evaluated comprehensively.The results showed that the correlation degree between the six physiological indexes and the comprehensive drought resistance index(CDI)under moderate drought stress were SOD(0.803),Chi(0.796),MDA(0.788),CAT(0.770),proline(0.756)and POD(0.755);Under severe drought stress,the correlation degree between the six physiological indexes and the CDI were SOD(0.725),MDA(0.724),Chl(0.718),proline(0.692),CAT(0.681)and POD(0.667).Based on the D value and WDI value,the drought resistance evaluation results of the two methods had some differences,but the drought resistance ranking of different varieties was basically the same.The correlation analysis of average DI of yield and values of(CD)and(CWDI)were positively correlated.According to the CWDI value,the 42 maize varieties were divided into high drought resistance,medium drought resistance,and low drought resistance,among which included two high drought resistant varieties,and 13 medium drought resistant varieties,27 low drought resistant varieties.Variance analysis showed that the DI of yield of high resistance maize group was significantly higher than that of medium resistance and low resistance.In conclusion,the above six physiological indexes of maize leaves combined can be used as reference indexes for physiological identification of drought resistance of maize varieties at the grain filling stage.Liaodan 145 and Jinhua 150 have strong drought resistance among 42 tested varieties.
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