Regulation of the calcium-sensing receptor in both stomatal movement and photosynthetic electron transport is crucial for water use efficiency and drought tolerance in Arabidopsis.
Regulation of the calcium-sensing receptor in both stomatal movement and photosynthetic electron transport is crucial for water use efficiency and drought tolerance in Arabidopsis.
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DOI：
10.1093/jxb/ert362
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发表时间：
2014-01
影响因子：
6.9
通讯作者：
Zheng HL
中科院分区：
文献类型：
--
作者：
Wang WH;Chen J;Liu TW;Chen J;Han AD;Simon M;Dong XJ;He JX;Zheng HL
植物钙敏感受体(CAS)通过影响光合作用电子传递的形成来优化光合作用。CAS还调节水分胁迫下的蒸腾作用。CAS与植物水分利用效率之间的一种新的相关性揭示了单位用水量产量(水分利用效率，WUE)与抗旱性密切相关。虽然气孔开度可以调节水分利用效率，但其潜在的分子机制仍不清楚。以往的报道表明，在拟南芥的钙敏感受体(CAS)反义系(CAAS)中，气孔关闭受到抑制。结果表明，CASA的抗旱性和水分利用效率下降与气孔开度调节不当导致的气孔导度升高有关，而与气孔密度的变化无关。CAAS植物也有较低的二氧化碳同化速率，这归因于较低的光合作用电子传递速率，导致较高的叶绿素荧光。基因共表达结合叶绿素含量和光合作用相关基因转录水平的分析表明，CAS参与了光合作用电子传递系统的形成。这些数据表明，CAS通过在气孔运动和光合作用电子传递的形成中发挥重要作用，从而调节水分利用效率和抗旱性，从而调节蒸腾作用和优化光合作用。
Plant calcium sensing receptor (CAS) optimizes photosynthesis by its effect on the formation of photosynthetic electron transport. CAS also regulates transpiration under water stress. A novel correlation between CAS and plant water use efficiency is revealed Production per amount of water used (water use efficiency, WUE) is closely correlated with drought tolerance. Although stomatal aperture can regulate WUE, the underlying molecular mechanisms are still unclear. Previous reports revealed that stomatal closure was inhibited in the calcium-sensing receptor (CAS) antisense line of Arabidopsis (CASas). Here it is shown that decreased drought tolerance and WUE of CASas was associated with higher stomatal conductance due to improper regulation of stomatal aperture, rather than any change of stomatal density. CASas plants also had a lower CO2 assimilation rate that was attributed to a lower photosynthetic electron transport rate, leading to higher chlorophyll fluorescence. Gene co-expression combined with analyses of chlorophyll content and transcription levels of photosynthesis-related genes indicate that CAS is involved in the formation of the photosynthetic electron transport system. These data suggest that CAS regulates transpiration and optimizes photosynthesis by playing important roles in stomatal movement and formation of photosynthetic electron transport, thereby regulating WUE and drought tolerance.
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