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Effects of Water Stress and Abscisic Acid on Transpiration Regulation in Wheat
Author(s) -
NORDIN ÅSA
Publication year - 1976
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.1399-3054.1976.tb03996.x
Subject(s) - transpiration , abscisic acid , water stress , shoot , mannitol , botany , horticulture , chemistry , biology , photosynthesis , biochemistry , gene
The transpiration response to recurrent light periods was studied'n water‐stressed wheat seedlings. Seedlings were stressed by three methods: addition of mannitol to the root medium, root cooling and drving of the roots in air. All three methods induced almost equal effects on transpiration regulation during alternating dark and light intervals. Exogenous abscisic acid supplied to the shoots of excised plants had qualitatively the same effect as water stress. Water stress and ABA increased the time lapse between light‐on and the onset of transpiration increase and lowered the amplitude of transpiration increase in light. Weak light introduced before strong light shortened the delay times.