Changes in leaf optical properties associated with light-dependent chloroplast movements
Changes in leaf optical properties associated with light-dependent chloroplast movements
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DOI：
10.1111/j.1365-3040.2011.02402.x
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发表时间：
2011-12-01
影响因子：
7.3
通讯作者：
Hangarter, Roger P.
中科院分区：
文献类型：
--
作者：
Davis, Phillip A.;Caylor, Steven;Hangarter, Roger P.
我们调查了24种植物，以研究叶片解剖结构如何影响叶绿体运动以及叶片的光学特性如何随叶绿体位置而变化。所有被研究的物种都表现出光依赖性的叶绿体运动，但相关的叶吸收率变化幅度差异很大。遮荫树种叶片吸收率的变化以叶绿体运动依赖的变化最大，在强光和弱光处理之间观察到吸收率的变化>10%。使用KubelkaMunk理论，我们发现，与叶绿体运动相关的吸收（k）和叶绿素a吸收效率（k*）的变化与细胞直径相关，因此，在阳叶中发现的更窄，更柱状的细胞限制了叶绿体的移动能力。更广泛的，更球形的细胞遮荫叶允许更大的叶绿体重排，并在低光条件下允许有效的光捕获。在整个物种的测试，光依赖性叶绿体运动调制叶光学特性和光吸收效率的操纵包（筛或压扁）的效果，但不是绕道（路径延长）的效果。
We surveyed 24 plant species to examine how leaf anatomy influenced chloroplast movement and how the optical properties of leaves change with chloroplast position. All species examined exhibited light-dependent chloroplast movements but the associated changes in leaf absorptance varied considerably in magnitude. Chloroplast movement-dependent changes in leaf absorptance were greatest in shade species, in which absorptance changes of >10% were observed between high- and low-light treatments. Using the KubelkaMunk theory, we found that changes in the absorption (k) and chlorophyll a absorption efficiency (k*) associated with chloroplast movement correlated with cell diameter, such that the narrower, more columnar cells found in sun leaves restricted the ability of chloroplasts to move. The broader, more spherical cells of shade leaves allowed greater chloroplast rearrangements and in low-light conditions allowed efficient light capture. Across the species tested, light-dependent chloroplast movements modulated leaf optical properties and light absorption efficiency by manipulating the package (sieve or flattening) effect but not the detour (path lengthening) effect.