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首页> 外文期刊>Journal of Experimental Botany >Increase rate of light-induced stomatal conductance is related to stomatal size in the genus Oryza
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Increase rate of light-induced stomatal conductance is related to stomatal size in the genus Oryza

机译：增加光气孔导度率与菊属属的气孔大小有关

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The rapid response of stomatal conductance (g(s)) to fluctuating irradiance is of great importance to maximize carbon assimilation while minimizing water loss. Smaller stomata have been proven to have a faster response rate than larger ones, but most of these studies have been conducted with forest trees. In the present study, the effects of stomatal anatomy on the kinetics of g(s) and photosynthesis were investigated in 16 Oryza genotypes. Light-induced stomatal opening includes an initial time lag (lambda) followed by an exponential increase. Smaller stomata had a larger maximum stomatal conductance increase rate (Sl(max)) during the exponential increase phase, but showed a longer time lag and a lower initial stomatal conductance (g(s,initial)) at low light. Stomatal size was, surprisingly, negatively correlated with the time required to reach 50% of maximum g(s) and photosynthesis (T-50%gs and T-50%A), which was shown to be positively correlated with lambda and negatively correlated with g(s,initial). With a lower g(s,initial) and a larger lambda, small stomata showed a faster decrease of intercellular CO2 concentration (C-i) during the induction process, which may have led to a slower apparent Rubisco activation rate. Therefore, smaller stomata do not always benefit photosynthesis as reported before; the influence of stomatal size on dynamic photosynthesis is also correlated with lambda and g(s,initial).
机译：气孔电导（G（S））与波动辐照度的快速响应具有重要意义，可以最大限度地提高碳同化，同时最小化水分损失。已经证明较小的气孔比较大的气孔更快，但这些研究中的大多数都是用森林树进行的。在本研究中，在16种oryza基因型中研究了气孔解剖学对G（s）和光合作用动力学的影响。光引起的气孔开口包括初始时间滞后（Lambda），然后是指数增加。在指数增加阶段期间，较小的气孔具有更大的最大气孔电导增加率（SL（最大）），但在低光下显示较长的时间滞后和较低的初始气孔电导（G（S，初始））。令人惊讶的是，气孔尺寸令人惊讶的是，与达到最大g（s）和光合作用的50％所需的时间（t-50％gs和t-50％a）呈负相关，这被证明与λ呈正相关并负相关与g（s，初始）。对于较低的G（s，初始）和较大的λ，在感应过程中，小孔表明细胞间CO 2浓度（C-1）的速度变得更快，这可能导致了较慢的明显的Rubisco活化速率。因此，较小的气孔并不总是如前所报告的益处光合作用;气孔大小对动态光合作用的影响也与Lambda和G（s，初始）相关。

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