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首页> 美国卫生研究院文献>Plant Physiology >Variable Mesophyll Conductance among Soybean Cultivars Sets a Tradeoff between Photosynthesis and Water-Use-Efficiency
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Variable Mesophyll Conductance among Soybean Cultivars Sets a Tradeoff between Photosynthesis and Water-Use-Efficiency

机译：大豆品种中不同的叶肉电导率在光合作用和水分利用效率之间建立了一个折衷

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摘要

Photosynthetic efficiency is a critical determinant of crop yield potential, although it remains below the theoretical optimum in modern crop varieties. Enhancing mesophyll conductance (i.e. the rate of carbon dioxide diffusion from substomatal cavities to the sites of carboxylation) may increase photosynthetic and water use efficiencies. To improve water use efficiency, mesophyll conductance should be increased without concomitantly increasing stomatal conductance. Here, we partition the variance in mesophyll conductance to within- and among-cultivar components across soybean (Glycine max) grown under both controlled and field conditions and examine the covariation of mesophyll conductance with photosynthetic rate, stomatal conductance, water use efficiency, and leaf mass per area. We demonstrate that mesophyll conductance varies more than 2-fold and that 38% of this variation is due to cultivar identity. As expected, mesophyll conductance is positively correlated with photosynthetic rates. However, a strong positive correlation between mesophyll and stomatal conductance among cultivars apparently impedes positive scaling between mesophyll conductance and water use efficiency in soybean. Contrary to expectations, photosynthetic rates and mesophyll conductance both increased with increasing leaf mass per area. The presence of genetic variation for mesophyll conductance suggests that there is potential to increase photosynthesis and mesophyll conductance by selecting for greater leaf mass per area. Increasing water use efficiency, though, is unlikely unless there is simultaneous stabilizing selection on stomatal conductance.
机译：光合作用效率是决定作物产量潜力的关键因素，尽管它仍然低于现代作物品种的理论最佳水平。增强叶肉电导率（即二氧化碳从气孔下腔扩散到羧化位点的速率）可以提高光合作用和用水效率。为了提高水分利用效率，应增加叶肉的电导率，同时不增加气孔的电导率。在这里，我们将叶肉电导的方差划分为在受控和田间条件下生长的大豆（大豆最大品种）的品种内和品种间的差异，并检验了叶肉电导与光合速率，气孔电导，水分利用效率和叶片的协变单位面积质量。我们证明了叶肉电导变化超过2倍，并且这种变化的38％是由于品种的同一性。如预期的那样，叶肉电导与光合速率呈正相关。然而，品种间叶肉和气孔导度之间的强正相关显然阻碍了大豆中叶肉导度和水分利用效率之间的正比例关系。与预期相反，光合速率和叶肉电导率均随单位面积叶片质量的增加而增加。叶肉电导的遗传变异的存在表明，通过选择每单位面积更大的叶片质量，有可能增加光合作用和叶肉电导。但是，除非同时对气孔导度进行稳定选择，否则不可能提高用水效率。

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