Circadian regulation of photosynthesis and transpiration from genes to ecosystems
Circadian regulation of photosynthesis and transpiration from genes to ecosystems
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DOI：
10.1016/j.envexpbot.2017.09.010
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发表时间：
2018-08-01
影响因子：
5.7
通讯作者：
Gessler, Arthur
中科院分区：
文献类型：
--
作者：
de Dios, Victor Resco;Gessler, Arthur
昼夜节律调节是一种内源性自我维持机制，其驱动时间基因表达，并且除其他外，影响光合作用（A）和气孔导度（g（s））的昼夜模式。在这里，我们回顾了目前的知识，昼夜节律调节驱动昼夜气体交换从基因到生态系统的领域。在一些模式物种中，生物钟结构的分子机制以及它们如何调节A和g（s）开始被阐明，但需要更多的数据来理解跨植物基因组的调节，特别是在裸子植物中，以及跨环境和尺度。昼夜节律分别占A和g（s）日间振荡的15-25%和30-35%，在C3和C4物种中，数据可用。因此，昼夜节律对昼夜气体交换的影响与温度或蒸汽压不足的影响具有相似的程度。此外，最近的研究结果表明，昼夜节律如何对生态系统的气体交换模式产生重大影响，这将挑战传统的方法来获得环境通量的依赖。由于缺乏适当的实验和建模设施，无法从实地和生态系统的环境反应中理清昼夜节律的影响，因此将实验室研究结果转移到实地的进展受到阻碍，并提供了方法学建议。环境压力对气体交换昼夜节律调节的影响也知之甚少。我们的文件如何昼夜控制气体交换可能是自适应的，允许植物预测高度可预测的环境线索，但也通过增加植物种群的环境变化的潜在气体交换反应的多样性。
Circadian regulation is an endogenous self-sustaining mechanism that drives temporal gene expression and, amongst others, affects the diurnal patterns of photosynthesis (A) and stomatal conductance (g(s)). Here we review current knowledge on how circadian regulation drives diurnal gas exchange from genes to ecosystems in the field. Molecular mechanisms underlying the structure of circadian clocks and how they regulate A and g(s), in a few model species are starting to be elucidated but additional data are required to understand regulation across phylogenies, especially within the gymnosperms, and across environments and scales. Circadian rhythms were responsible for 15-25% and for 30-35% of the daytime oscillations in A and g(s) respectively, across the C3 and C4 species for which data are available. Consequently, circadian effects over diurnal gas exchange are of similar magnitude to the effects of temperature or vapor pressure deficit. Moreover, recent findings indicate how circadian rhythms could exert significant impacts on ecosystem patterns of gas exchange, which would challenge conventional approaches to derive the environmental flux dependences. Progress in transferring laboratory findings to the field is being hampered by lack of suitable experimental and modeling facilities that can disentangle circadian effects from environmental responses in the field and in ecosystems, and methodological recommendations are offered. The effects of environmental stressors on circadian regulation of gas exchange are also poorly understood. We document how circadian control of gas exchange may be adaptive by allowing plants to anticipate highly predictable environmental cues, but also by increasing the diversity of potential gas exchange responses to environmental variation in plant populations.