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大豆是需水较多的作物,明确阶段性干旱对大豆根系主要生理特性的影响,对于进行更好的水分管理具有重要的理论和实践意义。试验于2013年5月-10月以春大豆为材料,采用盆栽方法,测定V3期、R4期和R5期干旱条件下根系超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性,进行统计分析。结果表明,在干旱胁迫条件下大豆根系保护酶活性显著增加,其中SOD、CAT活性中度干旱处理>重度干旱处理>适宜水分处理,POD活性重度干旱处理>中度干旱处理>适宜水分处理,其差异均达到显著水平;重度干旱处理SOD(除R5期外)、POD、CAT活性黑农57显著大于绥农26,适宜水分条件下品种间没有明显差异。
Soybean is a crop requiring more water. It is of great theoretical and practical significance to clarify the effects of staged drought on the main physiological characteristics of soybean root system for better water management. The experiment was conducted on spring soybean from May to October in 2013, and pot experiments were conducted to determine the activities of superoxide dismutase (SOD), peroxidase (POD) Catalase (CAT) activity, statistical analysis. The results showed that under drought stress, the activities of protective enzymes in soybean root increased significantly, of which SOD activity and CAT activity were medium drought treatment> severe drought treatment> proper moisture treatment, POD activity severe drought treatment> moderate drought treatment> suitable moisture treatment, respectively (P <0.05). The activity of POD and CAT in severely drought treatment SOD (except for stage R5) was significantly higher than that in Suinong 26, and there was no significant difference among the varieties under suitable water conditions.