濒危植物疏花水柏枝对模拟夏季水淹的生理生化响应

The Physiological and Biochemical Responses of Endangered Myricaria laxiflora to Simulated Summer Flooding

模拟水淹实验,分析濒危植物疏花水柏枝(Myricaria laxiflora)的一些重要生理生化指标对夏季水淹的响应。结果表明,疏花水柏枝植株在夏季无论水淹与否均处于休眠状态。水淹时植株溶性总糖、蔗糖的含量以及过氧化物酶的活性都显著增加,但与对照的差异不显著。水淹过后,植株迅速恢复生长,其可溶性总糖、蔗糖含量以及过氧化物酶和多酚氧化酶的活性逐渐下降,恢复到正常水平,但恢复阶段植株的生化指标与水淹和对照无显著差异。水淹植株的光合作用强度与蒸腾强度显著高于对照。疏花水柏枝在水淹期间的休眠以及相关的生理生化变化是对水淹的主动适应。

The responses of important physiological and biochemical parameters in Myriccria laxiflora were studied by simulated flooding. The results showed that M. laxiflora underwent dormancy during summer whether flooding or not. The contents of total soluble sugar and sucrose, and peroxidase （POD） activity increased under flooding, which had no significant difference with control. After summer flooding stress released, plants recovered growth quickly. The contents of total soluble sugar and sucrose, activities of POD and polyphenol oxidase （PPO） decreased to the normal level, which also had no significant difference between flooding and control. Transpiration rate and photosynthesis rate of submerged plants were higher markedly than those of control. It was concluded that the dormancy and the changes in physiological and biochemistry of 34. laxiflora were an active adaptation to summer flooding.