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Stomatal and leaf growth responses to partial drying of root tips in willow.

Liu, L. and McDonald, A. J. S. and Stadenberg, I. and Davies, William J. (2001) Stomatal and leaf growth responses to partial drying of root tips in willow. Tree Physiology, 21 (11). pp. 765-770.

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Abstract

Root tips of intact willow (Salix dasyclados Wimm., Clone 81-090) plants were partially dried by exposure to ambient greenhouse air and then kept in water-vapor-saturated air for up to 3 days. The drying treatment increased abscisic acid (ABA) concentrations in both the root tips subjected to drying and in the xylem sap, while it reduced leaf stomatal conductance and leaf extension rate. Despite the decrease in stomatal conductance, leaf water potentials were unaffected by the root drying treatment, indicating that the treatment reduced hydraulic conductivity between roots and foliage. After roots subjected to drying were returned to a nutrient solution or excised, ABA concentrations in the remaining roots and in the xylem sap, stomatal conductance of mature leaves and extension rate of unfolding leaves all returned to values observed in control plants. The 4-fold increase in xylem sap ABA concentration following the root drying treatment was not solely the result of reduced sap flow, and thus may be considered a potential cause, not merely a consequence, of the observed reduction in stomatal conductance.

Item Type: Article
Journal or Publication Title: Tree Physiology
Uncontrolled Keywords: abscisic acid ; leaf extension rate ; root drying ; stomatal conductance ; willow.
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
VC's Office
ID Code: 8894
Deposited By: Prof William J Davies
Deposited On: 16 May 2008 13:05
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:28
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/8894

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