Cost-benefit analysis of mesophyll conductance: diversities of anatomical, biochemical and environmental determinants
Cost-benefit analysis of mesophyll conductance: diversities of anatomical, biochemical and environmental determinants
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叶肉电导度的成本效益分析：解剖学、生化和环境决定因素的多样性
DOI：
10.1093/aob/mcac100
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发表时间：
2022
期刊：
影响因子：
4.2
通讯作者：
Terashima Ichiro
中科院分区：
文献类型：
--
作者：
Mizokami Yusuke;Oguchi Riichi;Sugiura Daisuke;Yamori Wataru;Noguchi Ko;Terashima Ichiro
背景植物在其结构和功能的构建和维护中投入光催化剂。这些投资被视为成本。这些成本通过叶片中的CO2同化率（A）来补偿，因此A被认为是直接的、短期的效益。在光合作用的叶片中，CO2从空气扩散到羧化位点受到几种结构和生物化学障碍的阻碍。CO2从细胞间隙向叶绿体基质的扩散受到叶肉阻力的阻碍。与之相反的是叶肉导度（gm）。本文综述了不同植物在不同生长条件下叶片构建成本（CC）、叶片维持成本（MC）和gm之间的关系。通过文献调查，我们证明了一个很强的线性关系，叶质量单位面积（LMA）和叶CC。CC与跨植物系统发育组的gm的总体相关性较弱，但在特定组和/或环境中明显存在显著趋势。对CC的投资对于LMA和叶肉细胞表面积（Smes）的增加是必要的。这使得叶片可以容纳更多的叶绿体，从而增加A。然而，LMA和/或Smes的增加往往伴随着其他变化，如细胞壁增厚，从而减少了sgm。结论在评价转基因对CC恢复的贡献时，叶片寿命是关键因子。与gm相关的MC估计，特别是调节水通道蛋白所需的成本，对于短期内有效控制gm可能至关重要。从长远来看，成本主要反映在CC上，而效益还包括最终的健身属性，即在一片叶子的生命周期内的综合碳增益，植物存活和生殖产出。
BackgroundPlants invest photosynthates in construction and maintenance of their structures and functions. Such investments are considered costs. These costs are recovered by the CO2assimilation rate (A) in the leaves, and thusAis regarded as the immediate, short-term benefit. In photosynthesizing leaves, CO2diffusion from the air to the carboxylation site is hindered by several structural and biochemical barriers. CO2diffusion from the intercellular air space to the chloroplast stroma is obstructed by the mesophyll resistance. The inverses is the mesophyll conductance (gm). Whether various plants realize an optimalgm, and how much investment is needed for a relevantgm, remain unsolved.ScopeThis review examines relationships among leaf construction costs (CC), leaf maintenance costs (MC) andgmin various plants under diverse growth conditions. Through a literature survey, we demonstrate a strong linear relationship between leaf mass per area (LMA) and leaf CC. The overall correlation of CC vs.gmacross plant phylogenetic groups is weak, but significant trends are evident within specific groups and/or environments. Investment in CC is necessary for an increase in LMA and mesophyll cell surface area (Smes). This allows the leaf to accommodate more chloroplasts, thus increasingA. However, increases in LMA and/orSmesoften accompany other changes, such as cell wall thickening, which diminishesgm. Such factors that make the correlations of CC andgmelusive are identified.ConclusionsFor evaluation of the contribution ofgmto recover CC, leaf life span is the key factor. The estimation of MC in relation togm, especially in terms of costs required to regulate aquaporins, could be essential for efficient control ofgmover the short term. Over the long term, costs are mainly reflected in CC, while benefits also include ultimate fitness attributes in terms of integrated carbon gain over the life of a leaf, plant survival and reproductive output.