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Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat

Citation

Corso, DG and Delzon, S and Lamarque, LJ and Cochard, H and Torres-Ruiz, JM and King, A and Brodribb, TJ, Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat, Plant Cell and Environment, 43, (4) pp. 854-865. ISSN 0140-7791 (2020) [Refereed Article]

Copyright Statement

2020 John Wiley & Sons Ltd.

DOI: doi:10.1111/pce.13722

Abstract

Identifying the drivers of stomatal closure and leaf damage during stress in grasses is a critical prerequisite for understanding crop resilience. Here, we investigated whether changes in stomatal conductance (g(s)) during dehydration were associated with changes in leaf hydraulic conductance (K-leaf), xylem cavitation, xylem collapse, and leaf cell turgor in wheat (Triticum aestivum). During soil dehydration, the decline of g(s) was concomitant with declining K-leaf under mild water stress. This early decline of leaf hydraulic conductance was not driven by cavitation, as the first cavitation events in leaf and stem were detected well after K-leaf had declined. Xylem vessel deformation could only account for <5% of the observed decline in leaf hydraulic conductance during dehydration. Thus, we concluded that changes in the hydraulic conductance of tissues outside the xylem were responsible for the majority of K-leaf decline during leaf dehydration in wheat. However, the contribution of leaf resistance to whole plant resistance was less than other tissues (<35% of whole plant resistance), and this proportion remained constant as plants dehydrated, indicating that K-leaf decline during water stress was not a major driver of stomatal closure.

Item Details

Item Type:Refereed Article
Keywords:crops, drought stress, hydraulic conductance
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Wheat
UTAS Author:Corso, DG (Miss Deborah Corso)
UTAS Author:Brodribb, TJ (Professor Tim Brodribb)
ID Code:151901
Year Published:2020
Web of Science® Times Cited:21
Deposited By:Office of the School of Natural Sciences
Deposited On:2022-08-08
Last Modified:2022-09-30
Downloads:0

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