Leaf Maximum Photosynthetic Rate and Venation Are Linked by Hydraulics

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ID: 301820
2007
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Abstract
Leaf veins are almost ubiquitous across the range of terrestrial plant diversity, yet their influence on leaf photosynthetic performance remains uncertain. We show here that specific physical attributes of the vascular plumbing network are key limiters of the hydraulic and photosynthetic proficiency of any leaf. Following the logic that leaf veins evolved to bypass inefficient water transport through living mesophyll tissue, we examined the hydraulic pathway beyond the distal ends of the vein system as a possible limiter of water transport in leaves. We tested a mechanistic hypothesis that the length of this final traverse, as water moves from veins across the mesophyll to where it evaporates from the leaf, governs the hydraulic efficiency and photosynthetic carbon assimilation of any leaf. Sampling 43 species across the breadth of plant diversity from mosses to flowering plants, we found that the post-vein traverse as determined by characters such as vein density, leaf thickness, and cell shape, was strongly correlated with the hydraulic conductivity and maximum photosynthetic rate of foliage. The shape of this correlation provided clear support for the a priori hypothesis that vein positioning limits photosynthesis via its influence on leaf hydraulic efficiency.
Reference Key
openalex_W2125610532 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Timothy J. Brodribb, Taylor S. Feild, Gregory J. Jordan
Journal Plant physiology and biochemistry : PPB
Year 2007
DOI
10.1104/pp.107.101352
URL
https://doi.org/10.1104/pp.107.101352
Keywords Keywords not found

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