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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Circadian control of carbohydrate availability for growth in Arabidopsis plants at night
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Circadian control of carbohydrate availability for growth in Arabidopsis plants at night

机译：夜间控制拟南芥植物生长中碳水化合物的利用率

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Plant growth is driven by photosynthetic carbon fixation during the day. Some photosynthate is accumulated, often as starch, to support nocturnal metabolism and growth at night. The rate of starch degradation in Arabidopsis leaves at night is essentially linear, and is such that almost all of the starch is used by dawn. We have investigated the timer that matches starch utilization to the duration of the night. The rate of degradation adjusted immediately and appropriately to an unexpected early onset of night. Starch was still degraded in an appropriate manner when the preceding light period was interrupted by a period of darkness. However, when Arabidopsis was grown in abnormal day lengths (28 h or 17 h) starch was exhausted ～24 h after the last dawn, irrespective of the actual dawn. A mutant lacking the LHY and CCA1 clock components exhausted its starch at the dawn anticipated by its fast-running circadian clock, rather than the actual dawn. Reduced growth of wild-type plants in 28-h days and Ihy/cca1 mutants in 24-h days was attributable to the inappropriate rate of starch degradation and the consequent carbon starvation at the end of night. Thus, starch degradation is under circadian control to ensure that carbohydrate availability is maintained until the next anticipated dawn, and this control is necessary for maintaining plant productivity.
机译：白天，植物的生长受到光合作用固碳的驱动。一些光合产物通常以淀粉的形式积累，以支持夜间的夜间代谢和生长。夜间拟南芥叶片中淀粉的降解速率基本上是线性的，因此几乎所有淀粉都在黎明时使用。我们研究了将淀粉利用率与一整夜相匹配的计时器。立即将降解率适当地调整至意外的黑夜发作。当前一个光周期被黑暗周期打断时，淀粉仍以适当的方式降解。但是，当拟南芥以异常的日长（28 h或17 h）生长时，无论实际黎明如何，在最后一次黎明后约24 h淀粉都被耗尽。一个缺少LHY和CCA1时钟成分的突变体在其快速运行的生物钟所预期的黎明时耗尽了淀粉，而不是实际的黎明。在28小时内野生型植物的生长减少，而在24小时内Ihy / cca1突变体的生长减少归因于淀粉降解速度不当以及在夜晚结束时碳饥饿。因此，淀粉降解处于昼夜节律控制下，以确保维持碳水化合物的利用直到下一个预期的黎明，并且这种控制对于维持植物的生产力是必要的。

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