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首页> 外文期刊>Photosynthesis Research: An International Journal >The physiological basis for genetic variation in water use efficiency and carbon isotope composition in Arabidopsis thaliana. (Special Issue: Photosynthesis and the environment.)
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The physiological basis for genetic variation in water use efficiency and carbon isotope composition in Arabidopsis thaliana. (Special Issue: Photosynthesis and the environment.)

机译：拟南芥水分利用效率和碳同位素组成遗传变异的生理基础。 （特刊：光合作用和环境。）

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摘要

Ecologists and physiologists have documented extensive variation in water use efficiency (WUE) in Arabidopsis thaliana, as well as association of WUE with climatic variation. Here, we demonstrate correlations of whole-plant transpiration efficiency and carbon isotope composition ( delta 13C) among life history classes of A. thaliana. We also use a whole-plant cuvette to examine patterns of co-variation in component traits of WUE and delta 13C. We find that stomatal conductance (gs) explains more variation in WUE than does A. Overall, there was a strong genetic correlation between A and gs, consistent with selection acting on the ratio of these traits. At a more detailed level, genetic variation in A was due to underlying variation in both maximal rate of carboxylation (Vcmax) and maximum electron transport rate (Jmax). We also found strong effects of leaf anatomy, where lines with lower WUE had higher leaf water content (LWC) and specific leaf area (SLA), suggesting a role for mesophyll conductance (gm) in variation of WUE. We hypothesize that this is due to an effect through gm, and test this hypothesis using the abi4 mutant. We show that mutants of ABI4 have higher SLA, LWC, and gm than wild-type, consistent with variation in leaf anatomy causing variation in gm and delta 13C. These functional data also add further support to the central, integrative role of ABI4 in simultaneously altering ABA sensitivity, sugar signaling, and CO2 assimilation. Together our results highlight the need for a more holistic approach in functional studies, both for more accurate annotation of gene function and to understand co-limitations to plant growth and productivity.
机译：生态学家和生理学家记录了拟南芥中水分利用效率（WUE）的广泛变化，以及WUE与气候变化的关系。在这里，我们证明了拟南芥生活史类别中整株植物蒸腾效率与碳同位素组成（δ 13 C）之间的相关性。我们还使用整株比色杯检查WUE和Delta 13 C的组件性状的协方差模式。我们发现，气孔导度（g s ）解释了WUE的变异大于A。总体而言，A与g s 之间存在很强的遗传相关性，与选择行为一致这些特征的比例。在更详细的水平上，A的遗传变异是由于最大羧化速率（V c max）和最大电子传递速率（Jmax）的潜在变异引起的。我们还发现了叶片解剖学的强大效果，其中WUE较低的品系具有较高的叶片含水量（LWC）和比叶面积（SLA），表明叶肉电导（g m ）在植物叶片的变化中具有一定作用。哇我们假设这是由于通过g m 产生的影响，并使用abi4突变体验证了这一假设。我们显示，ABI4突变体比野生型具有更高的SLA，LWC和g m ，这与叶片解剖结构变化导致g m 和δ变化一致13 C。这些功能性数据也进一步支持了ABI4在同时改变ABA敏感性，糖信号和CO 2 同化作用方面的核心作用。我们的研究结果共同表明，在功能研究中需要更全面的方法，既要更准确地注释基因功能，又要了解植物生长和生产力的共同局限性。

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