Circadian rhythm regulation in mangrove tree under aquatic environment controlled by tidal rhythm

昼夜节律是控制植物生理功能的重要机制之一。在红树林中，昼夜节律是非常显著的，然而红树林生态系统的生态位暴露在由潮汐淹没控制的异常水环境中，其昼夜节律（12小时25分钟）与昼夜节律（24小时）不同。为了阐明昼夜节律与红树林在潮汐节律性水环境中生理反应的关系，我们重点研究了昼夜节律相关功能基因叶绿素a/b结合蛋白（chlorophylla/b-binding protein，CAB 2）的基因表达。结果表明，即使在受潮汐节律控制的水环境中，红树林的昼夜节律也保持着一定的规律性。

Circadian rhythm is one of the most crucial mechanisms for controlling physiological function in plant species. In mangrove trees, circadian rhythm must be very significant, however the ecological niche of mangrove ecosystem is exposed to unusual aquatic environment controlled by tidal inundation, which has different rhythm (12 hours and 25 minutes) with circadian rhythm (24 hours). In order to elucidate the relationship between circadian rhythm and the physiological reaction of mangrove species exposed to tidal rhythmic aquatic environment, we studied especially about the gene expression of circadian rhythm related functional gene, chlorophyll a/b-binding protein (CAB2). As the result, it was suggested that the circadian rhythm was maintained regularly in mangrove tree even under aquatic environment controlled by tidal rhythm.