A recent resurgence of interest in formal optimisation theory has begun to improve our understanding of how variations in stomatal conductance and photosynthetic capacity control the response of whole plant photosynthesis and growth to the environment. However, mesophyll conductance exhibits similar variation and has similar impact on photosynthesis as stomatal conductance; yet, the role of mesophyll conductance in the economics of photosynthetic resource use has not been thoroughly explored. In this article, we first briefly summarise the knowledge of how mesophyll conductance varies in relation to environmental factors that also affect stomatal conductance and photosynthetic capacity, and then we use a simple analytical approach to begin to explore how these important controls on photosynthesis should mutually co-vary in a plant canopy in the optimum. Our analysis predicts that when either stomatal or mesophyll conductance is limited by fundamental biophysical constraints in some areas of a canopy, e.g. reduced stomatal conductance in upper canopy leaves due to reduced water potential, the other of the two conductances should increase in those leaves, while photosynthetic capacity should decrease. Our analysis also predicts that if mesophyll conductance depends on nitrogen investment in one or more proteins, then nitrogen investment should shift away from Rubisco and towards mesophyll conductance if hydraulic or other constraints cause chloroplastic CO2 concentration to decline. Thorough exploration of these issues awaits better knowledge of whether and how mesophyll conductance is itself limited by nitrogen investment, and about how these determinants of photosynthetic CO2 supply and demand co-vary among leaves in real plant canopies.

译文

:最近对形式最优化理论的兴趣重新兴起,开始使我们对气孔导度和光合能力的变化如何控制整株植物的光合作用和生长对环境的响应的理解有所提高。然而,叶肉电导率表现出相似的变化,并且对光合作用的影响与气孔电导率相似。但是,尚未深入探讨叶肉电导在光合资源利用经济学中的作用。在本文中,我们首先简要总结了有关叶肉电导率如何与也会影响气孔电导率和光合作用能力的环境因素有关的知识,然后我们使用一种简单的分析方法来探讨这些重要的光合作用控制应如何相互配合。 -以最佳的植物冠层变化。我们的分析预测,在冠层的某些区域,例如气孔或叶肉电导受到基本生物物理限制的情况下。由于水势降低,上冠层叶片气孔导度降低,这两种叶片中的另一种应增加,而光合能力应降低。我们的分析还预测,如果叶肉电导率取决于对一种或多种蛋白质的氮素投资,那么如果水力或其他限制因素导致叶绿体CO2浓度下降,则氮素投资应从Rubisco转向叶肉素体电导率。对这些问题的透彻探索有待于更好地了解叶肉电导率本身是否以及如何受到氮素投资的限制,以及这些光合作用CO2供求决定因素如何在实际植物冠层的叶片之间变化的知识。

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