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Linking auxin with photosynthetic rate via leaf venation







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Abstract
Land plants lose vast quantities of water to the atmosphere during photosynthetic gas exchange. In angiosperms a complex network of veins irrigates the leaf, and it is widely held that the density and placement of these veins determines maximum leaf hydraulic capacity and thus maximum photosynthetic rate. This theory is largely based on interspecific comparisons and has never been tested using vein mutants to examine the specific impact of leaf vein morphology on plant water relations. Here we characterise mutants at the Crispoid (Crd) locus in Pisum sativum, which have altered auxin homeostasis and activity in developing leaves, as well as reduced leaf vein density and aberrant placement of free-ending veinlets. This altered vein phenotype in crd mutant plants results in a significant reduction in leaf hydraulic conductance and leaf gas exchange. We find Crispoid to be a member of the YUCCA family of auxin biosynthetic genes. Our results link auxin biosynthesis with maximum photosynthetic rate through leaf venation, and substantiate the theory that an increase in the density of leaf veins coupled with their efficient placement can drive increases in leaf photosynthetic capacity.
Item Type: | Article |
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Authors/Creators: | McAdam, SAM and Eleouet, MP and Best, M and Brodribb, TJ and Carins Murphy, M and Cook, SD and Dalmais, M and Dimitriou, T and Gélinas-Marion, A and Gill, WM and Hegarty, M and Hofer, JMI and Maconochie, M and McAdam, EL and McGuiness, P and Nichols, DS and Ross, JJ and Sussmilch, FC and Urquhart, S |
Keywords: | auxin, photosynthesis, venation, vein density, leaf hydraulic conductivity |
Journal or Publication Title: | Plant Physiology |
Publisher: | Amer Soc Plant Biologists |
ISSN: | 0032-0889 |
DOI / ID Number: | 10.1104/pp.17.00535 |
Copyright Information: | Copyright 2017 American Society of Plant Biologists |
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