植物生长调节剂对甜樱桃休眠的调控及花芽酚类物质含量的影响

 以7年生甜樱桃( Prunus avium L. ) ‘红灯’和‘早红宝石’为试材, 研究了自然休眠期间植物生长调节剂对其休眠花芽酚类物质含量、相关酶活性以及萌芽率的影响。结果发现, 自然休眠前期,ABA促进酚类物质的积累, 6-BA、GA₃ 减缓了酚类物质的积累; 中期ABA使酚类物质一直维持较高水平,6-BA、GA₃ 促使酚类物质达到高峰, 然后降低; 后期ABA延缓了酚类物质的降低, 6-BA、GA₃ 效果相反。6-BA、CA₃两种生长调节剂中, CA₃对酚类物质的作用效果较为显著。ABA使苯丙氨酸解氨酶( PAL) 活性增强而降低了多酚氧化酶( PPO) 活性, 6-BA、GA₃ 降低了PAL的活性而使PPO活性增强。自然休眠的不同时期, 不同植物生长调节剂对萌芽率的影响效果也不同。6-BA、GA₃ 处理在自然休眠前期对萌芽率影响不明显, 中期打破了休眠, 使萌芽率超过50% , 后期效果与中期相似; ABA处理在整个自然休眠期间使萌芽率略有降低, 并抑制了休眠的解除。

Effects of Plant Growth Regulators on the Content of Phenolics in Sweet Cherry Dormant Flower Buds and Dormancy

The experiment was conducted with 7-year-old'Hongdeng'and'Zaohongbaoshi'sweet cherry(Prunus avium L.)trees,and effects of plant growth regulators on the content of phenolics and relate enzymes activity and rate of germination were analyzed and studied.Results showed that the effects of different plant growth regulators were different: ABA promoted the accumulation of phenolics 6-BA and GA_3 postponed the accumulation of phenolics in the primary stage;In the middle stage,ABA kept the content of phenolics high while 6-BA and GA_3 promoted the content of phenolics peak then it dropped;In the last period,ABA postponed the drop of the phenolics content,6-BA and GA_3 were contrary to ABA.The effect of CA_3 was better than that of ABA.ABA made PAL activity raise,and dropped the PPO activity;6-BA and GA_3 made PAL dropped but raised the PPO activity.Effects of different plant growth regulators on the germination rate were different in different periods of dormancy.In the primary stage,6-BA and GA_3 on the rate of germination were not obvious;In the middle stage,6-BA and GA_3 can break dormancy and made the rate of germination more than 50%;In the last period,effects of 6-BA and GA_3 were similar to the middle of stage.In the whole period of dormancy,ABA made the rate of germination lowerd and inhibited the dormancy-release.