Effects of Xylem pH on Transpiration from Wild-Type andflaccaTomato Leaves1
Open Access
- 1 June 1998
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 117 (2), 703-709
- https://doi.org/10.1104/pp.117.2.703
Abstract
The pH of xylem sap from tomato (Lycopersicon esculentum) plants increased from pH 5.0 to 8.0 as the soil dried. Detached wild-type but notflacca leaves exhibited reduced transpiration rates when the artificial xylem sap (AS) pH was increased. When a well-watered concentration of abscisic acid (0.03 μm) was provided in the AS, the wild-type transpirational response to pH was restored toflacca leaves. Transpiration from flaccabut not from wild-type leaves actually increased in some cases when the pH of the AS was increased from 6.75 to 7.75, demonstrating an absolute requirement for abscisic acid in preventing stomatal opening and excessive water loss from plants growing in many different environments.Keywords
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