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Plant Cell, Vol. 11, 1911-1924, October 1999, Copyright © 1999, American Society of Plant Physiologists
A Defect in ß-Oxidation Causes Abnormal Inflorescence Development in Arabidopsis
Todd A. Richmonda and
Anthony B. Bleeckera
a Department of Botany, University of WisconsinMadison, Madison, Wisconsin 53706
Correspondence to:
Anthony B. Bleecker, bleecker{at}facstaff.wisc.edu (E-mail), 608-262-7509 (fax)
The abnormal inflorescence meristem1 (aim1) mutation affects inflorescence and floral development in Arabidopsis. After the transition to reproductive growth, the aim1 inflorescence meristem becomes disorganized, producing abnormal floral meristems and resulting in plants with severely reduced fertility. The derived amino acid sequence of AIM1 shows extensive similarity to the cucumber multifunctional protein involved in ß-oxidation of fatty acids, which possesses L-3-hydroxyacyl-CoA hydrolyase, L-3-hydroxyacyl-dehydrogenase, D-3-hydroxyacyl-CoA epimerase, and 3, 2-enoyl-CoA isomerase activities. A defect in ß-oxidation has been confirmed by demonstrating the resistance of the aim1 mutant to 2,4-diphenoxybutyric acid, which is converted to the herbicide 2,4-D by the ß-oxidation pathway. In addition, the loss of AIM1 alters the fatty acid composition of the mature adult plant.
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