ABA、GA3 处理对冬枣采后果肉活性氧代谢的影响

 研究了100 mg·L ^{- 1}脱落酸(ABA) 和100μg·L ^{- 1}赤霉素(GA₃ ) 处理对冬枣冷藏期间果肉超氧阴离子自由基生成速率, 丙二醛、过氧化氢含量及相关酶活性变化的影响。结果表明: 低温( 0 ±2) ℃贮藏条件下, ABA处理促进了冬枣果肉丙二醛和过氧化氢的积累, 增大了超氧阴离子生成速率, 促进了过氧化氢酶(CAT) 和过氧化物酶( POD) 活性高峰提前出现, 多酚氧化酶( PPO) 活性的峰高增加,抗坏血酸氧化酶(AAO) 活性上升和酚类物质的快速下降, 说明果实后熟衰老被ABA处理提前, 而GA₃具有延缓作用, ABA和GA₃处理对活性氧代谢具有拮抗作用。

Effect of ABA and GA3 Treatments on the Metabolism of Active Oxygen Species in Cold Stored 'Brumal Jujube' Flesh

The changes of active oxygen species in ‘Brumal Jujube’flesh treated with 100 mg·L ^{- 1} ABA or 100μg·L ^{- 1} GA₃ during cold storage 〔(0 ±2) ℃, 60 days〕, including the p roduction rate of superoxide anion, contents of malondialdehyde (MDA ) or H₂O₂ and activities of catalase (CAT) , peroxidase( POD ) , polyphenoloxidase ( PPO ) and ascorbic acid oxidase (AAO ) , were investigated. The results showed that ABA increased the p roduction rate of superoxide anion, promoted the accumulations of MDA and H₂O₂ in ‘Brumal Jujube’during storage, the activity peaks of CAT, PPO and POD were advanced, and AAO activity kep t increasing, the content of total phenols decreased sharp ly, all of the parameters above were higher than those in control. They suggested that ABA treatment accelerated the senescence of‘Brumal Jujube’fruit. The effects of ABA on ‘Brumal Jujube’fruit were opposite to GA₃.