Hydrometeorology for plant omics: potential evaporation as a key index for transcriptome in rice
Hydrometeorology for plant omics: potential evaporation as a key index for transcriptome in rice
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DOI：
10.1016/j.envexpbot.2021.104724
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发表时间：
2021-11
影响因子：
5.7
通讯作者：
T. Kuwagata;Mari Murai-Hatano;Maya Matsunami;Shingo Terui;A. Nagano;A. Maruyama;S. Ishida
中科院分区：
文献类型：
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作者：
T. Kuwagata;Mari Murai-Hatano;Maya Matsunami;Shingo Terui;A. Nagano;A. Maruyama;S. Ishida
蒸腾作用是植物的一种重要生理现象，是由大气蒸腾需求引起的。然而，很少有人知道蒸腾需求和多种气象因素之间的定量关系，以及植物如何在基因和分子水平上对蒸腾需求的短时（逐日）变化作出反应。我们使用了一个基于物理的模型的热平衡和传输在饱和表面量化潜在蒸发（EP;蒸腾需求的水文气象指标）的敏感性，每个气象因素在广泛的气候条件下。敏感性分析表明，Ep随气象条件的变化在时间和空间上呈动态变化。即Ep随太阳辐射Sd的增大而增大，随风速WS的增大而增大，随相对湿度Rh的增大而减小。Ep对W和Rh的敏感性随Sd的减小而增大。Ep的对数随绝对温度的倒数近似线性地减小。在自然条件下，Ep作为蒸散需求的有效性被证实的高相关性，每小时为基础的Ep和每小时的蒸散量在淹水稻田。通过改变晴天气象条件4 h，研究了Ep短期变化对水稻抽穗期蒸腾作用（ET）和转录组的影响，ET随Ep的变化而变化，水稻叶片和根中包括水通道蛋白基因在内的许多基因的表达水平与ET呈显著的正相关或负相关，尤其是在叶片中。本研究表明，水稻植株可能会调整其生理条件，如水力传导度和叶肉导度，通过动态转录组的变化，以响应蒸腾需求在波动的气象条件下。
Transpiration is a major physiological phenomenon in plants and is induced by atmospheric transpirational demand. However, little is known about quantitative relationships between transpirational demand and multiple meteorological factors, and how plants respond to short-time (day-to-day) changes in transpirational demand at the gene and molecular levels. We used a physical-based model of heat balance and transfer at a saturated surface to quantify the sensitivity of potential evaporation (Ep; a hydrometeorological indicator of transpirational demand) to each meteorological factor under a wide range of climatic conditions. Sensitivity analysis showed thatEp varies dynamically in time and space with meteorological conditions. That is,Ep changes commensurately with solar radiationSd, somewhat increases with wind speedWS, while somewhat decreases with increasing relative humidityRh. The sensitivity ofEp toWSandRhincreases with decreasingSd. The logarithm ofEp decreases approximately linearly with increasing inverse absolute temperature. The validity of use ofEp as the transpirational demand under natural field conditions was confirmed by high correlation between hourly basedEp and hourly evapotranspiration in the flooded rice paddy fields. We also examined the effects of short-term changes inEp on transpiration (ET) and transcriptomes of rice at the heading stage by altering meteorological conditions on sunny days for four hours.ETchanged commensurately withEp, and the expression levels of numerous genes, including those encoding aquaporins in rice leaves and roots, showed a significant positive or negative correlation withET, especially in leaves. The present study suggests that rice plants may adjust their physiological condition, such as hydraulic conductivity and mesophyll conductance, through dynamic transcriptome changes in response to transpirational demand under fluctuating meteorological conditions.