Allometries of cell and tissue anatomy and photosynthetic rate across leaves of C 3 and C 4 grasses
Allometries of cell and tissue anatomy and photosynthetic rate across leaves of C 3 and C 4 grasses
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C 3 和 C 4 草叶细胞和组织解剖学的异速生长和光合速率
DOI：
10.1111/pce.14741
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Baird A
中科院分区：
文献类型：
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作者：
Baird A
叶片及其细胞的尺寸之间的异速生长关系在不同的真子叶中存在，但在草的叶片中尚未得到测试。我们假设，由于细胞发育和细胞功能（如水、营养和能量运输）的协调，组织间细胞大小和叶片尺寸的几何（比例）异速会出现，并且组织间细胞大小与光饱和光合速率有关。我们测试了在一个普通花园里生长的27种全球分布的c3和c4草的预测。我们发现组织内和组织间的平均细胞大小以及细胞大小与叶片尺寸呈正相关。草叶的解剖异速与菊科植物相似，除了细胞层数较少、形状较窄，以及表皮和束鞘在储存和叶片运动中的特殊作用。在不同物种中，每个组织中的平均细胞大小与每叶质量的光饱和光合速率有关，支持细胞大小的功能协调。这些发现强调了进化异速性在草系中的普遍性及其与协调发育和功能的相互联系。
Allometric relationships among the dimensions of leaves and their cells hold across diverse eudicotyledons, but have remained untested in the leaves of grasses. We hypothesised that geometric (proportional) allometries of cell sizes across tissues and of leaf dimensions would arise due to the coordination of cell development and that of cell functions such as water, nutrient and energy transport, and that cell sizes across tissues would be associated with light‐saturated photosynthetic rate. We tested predictions across 27 globally distributed C3and C4grass species grown in a common garden. We found positive relationships among average cell sizes within and across tissues, and of cell sizes with leaf dimensions. Grass leaf anatomical allometries were similar to those of eudicots, with exceptions consistent with the fewer cell layers and narrower form of grass leaves, and the specialised roles of epidermis and bundle sheath in storage and leaf movement. Across species, mean cell sizes in each tissue were associated with light‐saturated photosynthetic rate per leaf mass, supporting the functional coordination of cell sizes. These findings highlight the generality of evolutionary allometries within the grass lineage and their interlinkage with coordinated development and function.