高温干燥对白菜种子生命物质破坏机理的研究

Experimental Study on the Loss of Cabbage Seed Vitality During High Temperature Drying Process

采用恒温恒湿干燥箱和生理生化实验台进行干燥和分离,测试了白菜种子内部的过氧化氢酶(CAT)、过氧化物酶(POD)活性的变化,分析了高温干燥对种子生命特性的影响,结果表明,这些生命活性指标呈现钟罩型的变化趋势。随着胁迫时间延长,种子内部酶促保卫系统受到破坏,丙二醛(MDA)等有毒代谢物质含量迅速增加,最终使种子失去生命力。

The activities of CAT and POD during drying process were studied. It was found that the seed physiological activities increased at first and decreased at last. Effects of high temperature drying process on seed vitality were investigated in laboratory. The results indicated that there was some enzymes such as CAT and POD in the seed, which protected seed from destroy. As soon as the drying temperature was higher than seed can endure, toxic metabolite such as MDA increased as enzymes were destroyed, which lead to the loss of seed vitality.