研究PEG引发处理对新夏青二号、夏冬青和华王不结球白菜种子在不同温度下发芽特性和幼苗抗氧化特性的影响.结果表明:经PEG引发处理不结球白菜种子的发芽率、发芽势、发芽指数、活力指数和幼苗干鲜重、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)的活性均高于对照;膜脂过氧化产物丙二醛(MDA)含量降低;可溶性蛋白质和可溶性糖的含量均显著高于对照,不同品种的引发效果存在差异.以上结果显示,PEG引发提高了不结球白菜种子的活力并增强了幼苗的抗逆性.%The seeds of three non-heading Chinese cabbage cultivars Xinxiaqing 2, Xiadong qing, and Huawang were used as experimental materials, and the effects of priming treatment with PEG on the seed germination and physiological characters of seedlings were studied under different temperatures. The results showed that after priming treatment germination rate, germination vigor, germination index, vigor index of seeds, and the fresh and dry weights of seedlings were higher than those of control. The priming treatment with PEG significantly improved the activities of superoxide dismutase (SOD) ,peroxidase (POD) and catalase (CAT) of the seedlings but decreased the content of malondiadehyde (MDA) , resulting in that the soluble protein and soluble sugar contents in the treated seedlings were significantly higher than those of control. There were some differences in priming effects among different cultivars. The results showed that priming treatment with PEG could improve both the seed vigor and stress resistance of non-heading Chinese cabbage seedlings.
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