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Stomatal closure during leaf dehydration, correlation with other leaf physiological traits

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posted on 2023-05-16, 20:08 authored by Timothy BrodribbTimothy Brodribb, Holbrook, NM
The question as to what triggers stomatal closure during leaf desiccation remains controversial. This paper examines characteristics of the vascular and photosynthetic functions of the leaf to determine which responds most similarly to stomata during desiccation. Leaf hydraulic conductance (Kleaf) was measured from the relaxation kinetics of leaf water potential (ψ l), and a novel application of this technique allowed the response of Kleaf to ψl to be determined. These "vulnerability curves" show that Kleaf is highly sensitive to ψl and that the response of stomatal conductance to ψ l is closely correlated with the response of Kleaf to ψl. The turgor loss point of leaves was also correlated with Kleaf and stomatal closure, whereas the decline in PSII quantum yield during leaf drying occurred at a lower ψl than stomatal closure. These results indicate that stomatal closure is primarily coordinated with Kleaf. However, the close proximity of ψl at initial stomatal closure and initial loss of Kleaf suggest that partial loss of Kleaf might occur regularly, presumably necessitating repair of embolisms.

History

Publication title

Plant Physiology

Volume

132

Issue

4

Pagination

2166-2173

ISSN

0032-0889

Department/School

School of Natural Sciences

Publisher

American Society of Plant Biologists

Place of publication

United States

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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