Plant Physiology 90:728-733 (1989)
© 1989 American Society of Plant Biologists
Environmental and Stress Physiology
Reduced Accumulation of ABA during Water Stress in a Molybdenum Cofactor Mutant of Barley 1
Mary Walker-Simmons,
David A. Kudrna and
Robert L. Warner
U.S. Department of Agriculture, Agriculture Research Service, Wheat Genetics, Quality, Physiology and Disease Research, Washington State University, Pullman, Washington 99164-6420,
Department of Agronomy and Soils, Washington State University, Pullman, Washington 99164-6420
A barley (Hordeum vulgare L.) mutant (Az34) has been identified with low basal levels of abscisic acid (ABA) and with reduced capacity for producing ABA in response to water stress. The mutation is in a gene controlling the molybdenum cofactor resulting in a pleiotropic deficiency in at least three molybdoenzymes, nitrate reductase, xanthine dehydrogenase, and aldehyde oxidase. The mutant was found to lack aldehyde oxidase activity with several substrates including: (a) ABA aldehyde, a putative precursor of ABA; (b) an acetylenic analog of ABA aldehyde; and (c) heptaldehyde. Elevating the growth temperature from 18 to 26°C caused mutant leaves to wilt and brown. Desiccation of mutant leaves was prevented by applying ABA. These results indicate that ABA biosynthesis at some developmental stages is dependent upon a molybdoenzyme which may be an aldehyde oxidase.
1 Contribution from the U.S. Department of Agriculture, Agricultural Research Service, and the College of Agriculture and Home Economics Research Center, Washington State University, Project No. 0233. Scientific Paper No. 8901-07. This research was supported in part by National Science Foundation grant DMB 85-05095.
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