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Stomatal Closure during Leaf Dehydration, Correlation with Other Leaf Physiological Traits


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Brodribb, TJ and Holbrook, NM 2003 , 'Stomatal Closure during Leaf Dehydration, Correlation with Other Leaf Physiological Traits' , Plant Physiology, vol. 132, No. 4 , pp. 2166-2173 , doi: 10.1104/pp.103.023879.

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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 (l), and a novel application of this technique allowed the response of Kleaf to l to be determined. These
“vulnerability curves” show that Kleaf is highly sensitive to l and that the response of stomatal conductance to l is closely
correlated with the response of Kleaf to l. 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 l than stomatal closure. These results
indicate that stomatal closure is primarily coordinated with Kleaf. However, the close proximity of l at initial stomatal
closure and initial loss of Kleaf suggest that partial loss of Kleaf might occur regularly, presumably necessitating repair of

Item Type: Article
Authors/Creators:Brodribb, TJ and Holbrook, NM
Journal or Publication Title: Plant Physiology
ISSN: 0032-0889
DOI / ID Number: 10.1104/pp.103.023879
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