Stomata on the abaxial and adaxial leaf surfaces contribute differently to leaf gas exchange and photosynthesis in wheat.
Stomata on the abaxial and adaxial leaf surfaces contribute differently to leaf gas exchange and photosynthesis in wheat.
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DOI：
10.1111/nph.18257
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发表时间：
2022-09
期刊：
影响因子：
9.4
通讯作者：
Lawson, Tracy
中科院分区：
文献类型：
--
作者：
Wall, Shellie;Vialet-Chabrand, Silvere;Davey, Phillip;Van Rie, Jeroen;Galle, Alexander;Cockram, James;Lawson, Tracy
关键词：
虽然小麦旗叶的气孔通常在背面较多，但小麦旗叶在近轴面的密度较大。我们使用一种同时测量两个叶表面的新型气室来确定这种不太常见的气孔模式对气体通量的影响。利用不同的光照和每个叶表面的CO2浓度的组合，我们发现与近轴叶表面相关的叶肉细胞具有比与远轴叶表面相关的更高的光合作用能力，这是由于气孔导度的增加(由气孔密度的差异所驱动)。当叶背面的垂直气体通量被阻断时，没有观察到近轴面气孔的补偿，这表明每个表面是独立运行的。相似的气孔动力学表明两个表面之间存在一定的协调，但除了光照强度外，其他因素在这些反应中发挥了作用。叶片近轴面上较高的光合作用能力有利于碳同化和气孔导度的提高，这也有利于叶片蒸发降温，从而维持光合作用的最佳叶温。此外，远轴气体交换对叶片光合作用的贡献率约为50%，因此是整个叶片气体交换的重要贡献者。
Although stomata are typically found in greater numbers on the abaxial surface, wheat flag leaves have greater densities on the adaxial surface. We determine the impact of this less common stomatal patterning on gaseous fluxes using a novel chamber that simultaneously measures both leaf surfaces. Using a combination of differential illuminations and CO2 concentrations at each leaf surface, we found that mesophyll cells associated with the adaxial leaf surface have a higher photosynthetic capacity than those associated with the abaxial leaf surface, which is supported by an increased stomatal conductance (driven by differences in stomatal density). When vertical gas flux at the abaxial leaf surface was blocked, no compensation by adaxial stomata was observed, suggesting each surface operates independently. Similar stomatal kinetics suggested some co‐ordination between the two surfaces, but factors other than light intensity played a role in these responses. Higher photosynthetic capacity on the adaxial surface facilitates greater carbon assimilation, along with higher adaxial stomatal conductance, which would also support greater evaporative leaf cooling to maintain optimal leaf temperatures for photosynthesis. Furthermore, abaxial gas exchange contributed c. 50% to leaf photosynthesis and therefore represents an important contributor to overall leaf gas exchange.
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影响因子：
6.9
作者：
Carmo-Silva, A. Elizabete;Keys, Alfred J.;Andralojc, P. John;Powers, Stephen J.;Arrabaca, M. Celeste;Parry, Martin A. J.
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影响因子：
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DOI：
10.1073/pnas.0904209106
发表时间：
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影响因子：
11.1
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
6.9
作者：
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通讯作者：
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