First published online July 17, 2003; 10.1104/pp.103.023879
Plant Physiology 132:2166-2173 (2003)
© 2003 American Society of Plant Biologists
WHOLE PLANT AND ECOPHYSIOLOGY
Stomatal Closure during Leaf Dehydration, Correlation with Other Leaf Physiological Traits1
Tim J. Brodribb* and
N. Michele Holbrook
Department of Organismic and Evolutionary Biology, Harvard University, 16
Divinity Avenue, Cambridge, Massachusetts
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 embolisms.
1 This work was supported by the National Science Foundation (grant no. IBN
0212792) and by the Andrew Mellon Foundation.
*
Corresponding author; e-mail
brodribb{at}fas.harvard.edu;
fax 617–496–5854.
Received April 24, 2003;
returned for revision May 18, 2003;
accepted May 18, 2003.
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