植物的昼夜时钟增加了光合作用,增长,生存和竞争优势
Antony N Dodd1, Neeraj Salathia, Anthony Hall
1Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EA, UK.
Science (New York, N.Y.)
|July 26, 2005
概括
将植物的内部昼夜时钟与每日光周期相匹配,可以提供显著的光合作用优势. 这种同步增强了叶绿素,碳固定,生长和生存在Arabidopsis thaliana.
科学领域:
- 植物生物学 植物生物学
- 时间生物学 时间生物学
- 光合作用 光合作用
背景情况:
- 循环时钟是大多数有机体 (包括植物) 中存在的内部生物计时器.
- 虽然已知昼夜时钟对植物有好处,但所赋予的具体优势在很大程度上仍未被定义.
- 了解昼夜节律在植物生理学中的作用对于农业和生态科学至关重要.
研究的目的:
- 研究植物中昼夜时钟与外部环境同步的功能优势.
- 为了确定昼夜时钟周期和光暗周期之间的精确匹配是否可以提高工厂的性能.
- 阐明生物钟调节的好处背后的生理机制.
主要方法:
- 使用野生类型和突变的Arabidopsis thaliana与改变的昼夜时钟周期 (长短).
- 将植物暴露在受控的光暗周期中,这些周期与其内生昼夜周期相匹配或不相匹配.
- 量化生理参数,包括叶绿素含量,碳固定率,生长率和生存率.
主要成果:
- 具有与环境同步的昼夜时钟周期的植物表现出显著更高的叶绿素含量.
- 同步的植物表现出增强的碳固定,因此,增长速度更快.
- 在野生类型和突变植物中观察到更好的生存率,当它们的昼夜时钟与日夜周期相匹配时.
- 具有不匹配昼夜周期的植物在所有测量的生理参数中表现下降.
结论:
- 植物昼夜时钟周期与外部光暗周期之间的精确对齐赋予了实质性的光合作用优势.
- 这种同步优化了关键的生理过程,从而改善了植物的生长和生存.
- 这些发现清楚地解释了植物中昼夜控制的进化优势.
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