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Linking auxin with photosynthetic rate via leaf venation

journal contribution
posted on 2023-05-19, 09:19 authored by McAdam, SAM, Eleouet, MP, Best, M, Timothy BrodribbTimothy Brodribb, Madeline Carins-MurphyMadeline Carins-Murphy, Cook, SD, Dalmais, M, Dimitriou, T, Ariane Gelinas-MarionAriane Gelinas-Marion, Warwick GillWarwick Gill, Hegarty, M, Hofer, JMI, Maconochie, M, Erin McAdam, McGuiness, P, David NicholsDavid Nichols, John RossJohn Ross, Frances SussmilchFrances Sussmilch, Shelley UrquhartShelley Urquhart
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.

Funding

Australian Research Council

History

Publication title

Plant Physiology

Volume

175

Pagination

351-360

ISSN

0032-0889

Department/School

School of Natural Sciences

Publisher

Amer Soc Plant Biologists

Place of publication

15501 Monona Drive, Rockville, USA, Md, 20855

Rights statement

Copyright 2017 American Society of Plant Biologists

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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