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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
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
Related URLs:	UTAS Profile: McAdam, SAM Google Scholar: Brodribb, TJ UTAS Profile: Brodribb, TJ Google Scholar: Carins Murphy, M UTAS Profile: Carins Murphy, M UTAS Profile: McAdam, EL Google Scholar: Nichols, DS UTAS Profile: Nichols, DS UTAS Profile: Ross, JJ Google Scholar: Sussmilch, FC UTAS Profile: Sussmilch, FC
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