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Plant Cell, Vol. 12, 405-418, March 2000, Copyright © 2000, American Society of Plant Physiologists

Deficiency in Fatty Acid Synthase Leads to Premature Cell Death and Dramatic Alterations in Plant Morphology

Zhonglin Moua, Yikun Hea, Ya Daia, Xinfang Liua, and Jiayang Lia
a Institute of Genetics, Chinese Academy of Sciences, Beijing 100101, China

Correspondence to: Jiayang Li, at Institute of Genetics, Chinese Academy of Sciences, Building 917, Datun Rd., Chaoyang District, Beijing 100101, China., jyli{at}igtp.ac.cn (E-mail), 86-10-64873428 (fax)

An Arabidopsis mosaic death1 (mod1) mutant, which has premature cell death in multiple organs, was isolated. mod1 plants display multiple morphological phenotypes, including chlorotic and curly leaves, distorted siliques, premature senescence of primary inflorescences, reduced fertility, and semidwarfism. The phenotype of the mod1 mutant results from a single nuclear recessive mutation, and the MOD1 gene was isolated by using a map-based cloning approach. The MOD1 gene encodes an enoyl-acyl carrier protein (ACP) reductase, which is a subunit of the fatty acid synthase complex that catalyzes de novo synthesis of fatty acids. An amino acid substitution in the enoyl-ACP reductase of the mod1 mutant causes a marked decrease in its enzymatic activity, impairing fatty acid biosynthesis and decreasing the amount of total lipids in mod1 plants. These results demonstrate that a deficiency in fatty acid biosynthesis has pleiotropic effects on plant growth and development and causes premature cell death.




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