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Effect of Abscisic Acid on the Transpiration of Zea mays
Author(s) -
TALHA MAHMOUD,
LARSEN POUL
Publication year - 1975
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1975.tb03767.x
Subject(s) - transpiration , abscisic acid , distilled water , chemistry , horticulture , zea mays , botany , photosynthesis , biology , agronomy , biochemistry , chromatography , gene
Intact plants of Zea mays L. were treated with foliar sprays of cis‐trans ‐abscisic acid (ABA) at concentrations from 10 −9 to 10 −4 M. Even the lowest concentration caused a reduction of the transpiration rate as measured between 1 and 33 h after spraying. With increasing ABA concentrations, there was a nearly linear relationship between the logarithm of the ABA concentration and the (decreasing) transpiration rate within that period. Subsequently a partial recovery of the transpiration rate set in, beginning progressively later as the ABA concentration was increased. After 5 1/2 days the transpiration rate of plants treated with 10 −9 and 10 −8 M was nearly back to normal, whereas plants treated with 10 −4 M transpiration at only about 2/3 their normal rate. In experiments with detached maize leaves supplied with water or ABA solutions (10 −8 to 10 −5 M ) through their cut bases, the transpiration of control leaves decreased gradually to a low level in 24 h. ABA caused a marked and rapid reduction of the transpiration rate compared to that of the controls. After a few hours, the transpiration of the treated leaves decreased at a slower rate than that of the controls, thus approaching the control values. After 35 h, the transpiration of leaves treated with 10 −5 M ABA was nearly the same as in untreated leaves. Exchanging the ABA solution for distilled water after 24 h had little effect on the subsequent course of the transpiration rate.