Effects of Cadmium Concentration on Seedling Growth and Physiological Characteristics of Different Maize Varieties
Soil cadmium(Cd)pollution poses a significant threat to crop production.In this study,four maize va-rieties,Zhengdan958,Yudan9953,Zhengda999 and Jingnongke728 were used as experimental materials,and differ-ent Cd concentrations(0 mg/L,3 mg/L,6 mg/L,9 mg/L)were set by laboratory hydroponics to study the differences of seedling growth indexes and related physiological indexes of four maize cultivars after Cd stress for 9d,and the comprehensive evaluation of Cd tolerance was carried out by principal component analysis and membership function method.The results showed that Cd had an inhibiting effect on the plant height,root length,shoot fresh weight,root fresh weight,shoot dry weigh and root dry weight at the seedling stage of the four maize varieties,but had little effect on root number.With the increase of Cd stress concentration,the total chlorophyll content of Zhengdan958,Yu-dan9953 and Jingnongke728 showed a downward trend,while Zhengda999 showed a trend of first rising and then de-creasing.Compared with Zhengdan958 and Zhengda999,the POD activity of Jingnongke728 and Yudan9953 in-creased significantly compared with the control,and the MDA content was less affected.According to the principal component analysis and membership function method,the order of Cd tolerance of four maize cultivars was as fol-lows:Jingnongke728＞Yudan9953＞Zhengdan958＞Zhengda999.
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