Responses of leaf stomatal density to water status and its relationship with photosynthesis in a grass.
Responses of leaf stomatal density to water status and its relationship with photosynthesis in a grass.
复制标题
叶子气孔密度对水状态的反应及其与草中光合作用的关系。
DOI：
10.1093/jxb/ern185
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发表时间：
2008
影响因子：
6.9
通讯作者：
Zhou, Guangsheng
中科院分区：
文献类型：
--
作者：
Xu, Zhenzhu;Zhou, Guangsheng
关键词：
植物叶片气孔导度和光合作用对水分亏缺的响应已被广泛报道，但关于气孔密度与水分状况和气体交换的关系却知之甚少。研究了不同土壤水分条件下多年生羊草的光合作用，测定了气孔密度对叶片水分状况的响应，并与比叶面积(SLA)进行了相关分析。中度水分亏缺对气孔数量有积极影响，但严重水分亏缺导致气孔数量减少，符合二次抛物线曲线。气孔大小随水分亏缺而明显减小，气孔密度与气孔导度(GS)、净CO2同化率(AN)和水分利用效率(WUE)呈正相关。SLA与气孔密度呈显著负相关，表明叶面积与叶物质之间的平衡可能与保卫细胞数量有关。这些结果表明，气孔密度和保卫细胞大小的高度灵活性会随着水分状况的变化而变化，这一过程可能与光合作用和水分利用效率密切相关。
Responses of plant leaf stomatal conductance and photosynthesis to water deficit have been extensively reported; however, little is known concerning the relationships of stomatal density with regard to water status and gas exchange. The responses of stomatal density to leaf water status were determined, and correlation with specific leaf area (SLA) in a photosynthetic study of a perennial grass, Leymus chinensis, subjected to different soil moisture contents. Moderate water deficits had positive effects on stomatal number, but more severe deficits led to a reduction, described in a quadratic parabolic curve. The stomatal size obviously decreased with water deficit, and stomatal density was positively correlated with stomatal conductance (gs), net CO2 assimilation rate (An), and water use efficiency (WUE). A significantly negative correlation of SLA with stomatal density was also observed, suggesting that the balance between leaf area and its matter may be associated with the guard cell number. The present results indicate that high flexibilities in stomatal density and guard cell size will change in response to water status, and this process may be closely associated with photosynthesis and water use efficiency.
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影响因子：
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