Impact of Varying Salt Stress on Maize Seed Germination and Seedling Growth
To provide a theoretical basis for selecting salt-tolerant maize varieties for seed production and saline-alkali soil cultivation in Zhangye City,this study used maize varieties Huadan 86,Pengyu 17,SK567,and Henong No.1 as test materi-als.The seeds were treated with varying concentrations of NaCl(100,200,300,400,and 500 mmol/L)with distilled water as the control.The germination indices,seedling morphological characteristics,and physiological indices of maize were measured.The results showed that low salt concentrations had minimal impact on the germination rate of the four maize varieties,while high NaCl concentrations significantly reduced the germination rate of Henong No.1.As NaCl concentration increased,the germina-tion potential,relative germination index,and relative seed vigor index significantly decreased.Morphological growth,including plant height,leaf length,and root length,was inhibited,though Henong No.1 showed slower inhibition.The higher the NaCl con-centration,the more pronounced the differences in proline content between the varieties and the control group.At 500 mmol/L Na-Cl,proline content reached its peak,with Henong No.1 having the highest level.As NaCl concentration increased,MDA content and relative conductivity also rose across all varieties.SK567 had the highest MDA content,while Henong No.1 had the lowest.The relative conductivity of Pengyu 17 and Huadan 86 increased rapidly,while SK567 and Henong No.1 showed slower increas-es.Based on the effects of salt stress on germination,seedling growth,and physiological indices,Henong No.1 was identified as the most salt-tolerant variety,followed by SK567,Pengyu 17,and Huadan 86.
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