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Plant and Cell Physiology, 1986, Vol. 27, No. 3 383-390
© 1986

Article

Triadimefon Protects Bean Plants from Water Stress through its Effects on Abscisic Acid

N. K. Asare-Boamah1, G. Hofstra1, R. A. Fletcher1 and E. B. Dumbroff2

1Department of Environmental Biology, University of Guelph Guelph, Ontario NIG 2W1, Canada
2Department of Biology, University of Waterloo Waterloo, Ontario, N2L 3G1, Canada

Triadimefon is a fungicide that has plant growth regulating properties. In beans (Phaseolus vulgaris L.) it significantly reduced shoot weight, shoot length and leaf area, and roots appeared whiter and thicker in the treated plants. Chlorophyll and carotenoid levels were increased in the leaves, but triadimefon did not affect protein levels in either leaves or roots. Triadimefon reduced transpiration and protected the plants from drought. It increased leaf diffusive resistance indicating partial closure of the stomates, and treated plants maintained their water potentials while those of the controls declined. Osmotic potentials of both treated and control leaves fell, but values in the controls were significantly lower than those from the treated plants. Three days after treatment with triadimefon in both water stressed and non-stressed plants the abscisic acid levels in the leaves of the treated plants were more than twice the levels of the controls. It appears therefore that the protection conveyed by triadimefon during water stress is mediated at least partially, via its effects on ABA levels in treated tissue.

(Received October 12, 1985; Accepted January 8, 1986)
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