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Linking auxin with photosynthetic rate via leaf venation

Citation

McAdam, SAM and Eleouet, MP and Best, M and Brodribb, TJ and Carins-Murphy, MR and Cook, SD and Dalmais, M and Dimitriou, T and Gelinas-Marion, A and Gill, WM and Hegarty, M and Hofer, JMI and Maconochie, M and McAdam, E and McGuiness, PN and Nichols, DS and Ross, JJ and Sussmilch, F and Urquhart, S, Linking auxin with photosynthetic rate via leaf venation, Plant Physiology, 175, (1) pp. 351-360. ISSN 0032-0889 (2017) [Refereed Article]


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DOI: doi:10.1104/pp.17.00535

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 Details

Item Type:Refereed Article
Keywords:auxin, photosynthesis, venation, vein density, leaf hydraulic conductivity
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:McAdam, SAM (Dr Scott McAdam)
Author:Best, M (Ms Melanie Best)
Author:Brodribb, TJ (Dr Tim Brodribb)
Author:Carins-Murphy, MR (Miss Madeline Carins-Murphy)
Author:Cook, SD (Mr Sam Cook)
Author:Dimitriou, T (Mr Theodore Dimitriou)
Author:Gelinas-Marion, A (Ms Ariane Gelinas-Marion)
Author:Gill, WM (Dr Warwick Gill)
Author:Maconochie, M (Ms Mary Maconochie)
Author:McAdam, E (Dr Erin McAdam)
Author:McGuiness, PN (Mr Peter McGuiness)
Author:Nichols, DS (Dr David Nichols)
Author:Ross, JJ (Associate Professor John Ross)
Author:Sussmilch, F (Dr Frances Sussmilch)
Author:Urquhart, S (Miss Shelley Urquhart)
ID Code:119806
Year Published:2017
Funding Support:Australian Research Council (DP140100666)
Deposited By:Plant Science
Deposited On:2017-08-04
Last Modified:2017-09-25
Downloads:0

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