Similar geometric rules govern the distribution of veins and stomata in petals, sepals and leaves.
Similar geometric rules govern the distribution of veins and stomata in petals, sepals and leaves.
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DOI：
10.1111/nph.15210
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发表时间：
2018-09
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影响因子：
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通讯作者：
Feng-Ping Zhang;Madeline R Carins Murphy;A. Cardoso;G. Jordan;T. Brodribb
中科院分区：
文献类型：
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作者：
Feng-Ping Zhang;Madeline R Carins Murphy;A. Cardoso;G. Jordan;T. Brodribb
在叶脉上的投资（供应木质部水）由气孔丰度平衡，使得当土壤水分充足时，为气孔提供足够的水分运输以保持开放。这种协调是由一个共同的依赖静脉和气孔密度对细胞大小介导的。如果花依赖于韧皮部提供的水分或具有高的非气孔蒸腾速率，则它们可能不符合这种相同的发育模式。我们研究了27种被子植物叶片、萼片和花瓣的叶脉、气孔和表皮细胞之间的关系，以确定是否共同的间距规则适用于所有组织。回归分析没有发现器官类型之间存在不同关系的证据。静脉和气孔密度与器官内的表皮细胞大小密切相关，但是，对于一个给定的表皮细胞大小，花瓣有较少的静脉和气孔比萼片，这比叶。虽然我们的数据支持的概念，共同缩放之间的静脉和气孔在叶和花，花瓣静脉密度的大的多样性表明，在某些物种，花瓣静脉可能从事额外的功能，如供水高角质蒸腾或韧皮部提供水或碳水化合物。
Investment in leaf veins (supplying xylem water) is balanced by stomatal abundance, such that sufficient water transport is provided for stomata to remain open when soil water is abundant. This coordination is mediated by a common dependence of vein and stomatal densities on cell size. Flowers may not conform to this same developmental pattern if they depend on water supplied by the phloem or have high rates of nonstomatal transpiration. We examined the relationships between veins, stomata and epidermal cells in leaves, sepals and petals of 27 angiosperms to determine whether common spacing rules applied to all tissues. Regression analysis found no evidence for different relationships within organ types. Both vein and stomatal densities were strongly associated with epidermal cell size within organs, but, for a given epidermal cell size, petals had fewer veins and stomata than sepals, which had fewer than leaves. Although our data support the concept of common scaling between veins and stomata in leaves and flowers, the large diversity in petal vein density suggests that, in some species, petal veins may be engaged in additional functions, such as the supply of water for high cuticular transpiration or for phloem delivery of water or carbohydrates.