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白菜采后在20±1℃条件下乙烯释放量呈峰型变化,O-2产生速率迅速大幅度上升,而SOD、CAT活性快速下降,使膜脂过氧化产物MDA含量和膜透性提高;在10±1℃和5±1℃条件下,乙烯释放量持续下降,活性氧代谢保持相对平衡,MDA含量和膜透性被控制在较低水平上。结果表明,活性氧代谢失调是导致白菜采后叶片衰老的重要因素。
After 20 ± 1 ℃ cabbage harvest, the ethylene release peaked, the O-2 production rate increased rapidly and the SOD and CAT activities decreased rapidly, which increased the content of membrane lipid peroxidation and membrane permeability. Under the conditions of 10 ± 1 ℃ and 5 ± 1 ℃, the release of ethylene decreased continuously, the metabolism of reactive oxygen species remained relatively balanced, and the MDA content and membrane permeability were controlled at lower levels. The results showed that the imbalance of reactive oxygen species was the important factor leading to the leaf senescence of Chinese cabbage.