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The relationship between stomatal resistance and abscisic-acid levels in leaves of water-stressed bean plants

✍ Scribed by D. C. Walton; Eva Galson; M. A. Harrison

Publisher: Springer-Verlag
Year: 1977
Tongue: English
Weight: 375 KB
Volume: 133
Category: Article
ISSN: 0032-0935
DOI: 10.1007/bf00391912

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✦ Synopsis

Leaf water potentials of Phaseolus vulgaris L. plants exposed to a -3 . 0 bar root medium were reduced to between -7 and -9 bars within 25 rain and remained constant for the next several hours. This treatment led to considerable variation between leaves in both abscisic-acid (ABA) content and Rs, although the two were well correlated after a 5-h treatment. There was an apparent 7-fold increase in leaf ABA levels necessary to initiate stomatal closure when plants were exposed to a -3 . 0 bar treatment, but when plants were exposed to a -5 . 0 bar stress Rs values increased prior to any detectable rise in ABA levels. To explain these seemingly contradictory results, we suggest that the rate of ABA synthesis in the leaf, rather than the total ABA content, determines the status of the stomatal aperture.

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