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Vein density is independent of epidermal cell size in Arabidopsis mutants

Citation

Carins-Murphy, MR and Dow, GJ and Jordan, GJ and Brodribb, TJ, Vein density is independent of epidermal cell size in Arabidopsis mutants, Functional Plant Biology, 44, (4) pp. 410-418. ISSN 1445-4408 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 CSIRO

DOI: doi:10.1071/FP16299

Abstract

Densities of leaf minor veins and stomata are co-ordinated within and across vascular plants. This maximises the benefit-to-cost ratio of leaf construction by ensuring stomata receive the minimum amount of water required to maintain optimal aperture. A ‘passive dilution’ mechanism in which densities of veins and stomata are co-regulated by epidermal cell size is thought to facilitate this co-ordination. However, unlike stomata, veins are spatially isolated from the epidermis and thus may not be directly regulated by epidermal cell expansion. Here, we use mutant genotypes of Arabidopsis thaliana (L.) Heynh. with altered stomatal and epidermal cell development to test this mechanism. To do this we compared observed relationships between vein density and epidermal cell size with modelled relationships that assume veins and stomata are passively diluted by epidermal cell expansion. Data from wild-type plants were consistent with the ‘passive dilution’ mechanism, but in mutant genotypes vein density was independent of epidermal cell size. Hence, vein density is not causally linked to epidermal cell expansion. This suggests that adaptation favours synchronised changes to the cell size of different leaf tissues to coordinate veins and stomata, and thus balance water supply with transpirational demand.

Item Details

Item Type:Refereed Article
Keywords:pavement cells, xylem, vascular tissue
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:Carins-Murphy, MR (Miss Madeline Carins-Murphy)
Author:Jordan, GJ (Associate Professor Greg Jordan)
Author:Brodribb, TJ (Dr Tim Brodribb)
ID Code:119810
Year Published:2017
Funding Support:Australian Research Council (DP140100666)
Deposited By:Plant Science
Deposited On:2017-08-04
Last Modified:2017-09-07
Downloads:0

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