1. A promoter polymorphism defines distinct roles in anther development for Col-0 and Ler-0 alleles of Arabidopsis ACYL-COA BINDING PROTEIN3.
- Author
-
Guo ZH, Hu TH, Hamdan MF, Li M, Wang R, Xu J, Lung SC, Liang W, Shi J, Zhang D, and Chye ML
- Subjects
- Diazepam Binding Inhibitor metabolism, Diazepam Binding Inhibitor genetics, Ecotype, Mutation genetics, Phenotype, Polymorphism, Genetic, Alleles, Arabidopsis genetics, Arabidopsis growth & development, Arabidopsis Proteins genetics, Arabidopsis Proteins metabolism, Flowers genetics, Flowers growth & development, Gene Expression Regulation, Plant, Promoter Regions, Genetic genetics
- Abstract
Acyl-CoA-Binding Proteins (ACBPs) bind acyl-CoA esters and function in lipid metabolism. Although acbp3-1, the ACBP3 mutant in Arabidopsis thaliana ecotype Col-0, displays normal floral development, the acbp3-2 mutant from ecotype Ler-0 characterized herein exhibits defective adaxial anther lobes and improper sporocyte formation. To understand these differences and identify the role of ERECTA in ACBP3 function, the acbp3 mutants and acbp3-erecta (er) lines were analyzed by microscopy for anther morphology and high-performance liquid chromatography for lipid composition. Defects in Landsberg anther development were related to the ERECTA-mediated pathway because the progenies of acbp3-2 × La-0 and acbp3-1 × er-1 in Col-0 showed normal anthers, contrasting to that of acbp3-2 in Ler-0. Polymorphism in the regulatory region of ACBP3 enabled its function in anther development in Ler-0 but not Col-0 which harbored an AT-repeat insertion. ACBP3 expression and anther development in acbp3-2 were restored using ACBP3pro (Ler)::ACBP3 not ACBP3pro (Col)::ACBP3. SPOROCYTELESS (SPL), a sporocyte formation regulator activated ACBP3 transcription in Ler-0 but not Col-0. For anther development, the ERECTA-related role of ACBP3 is required in Ler-0, but not Col-0. The disrupted promoter regulatory region for SPL binding in Col-0 eliminates the role of ACBP3 in anther development., (© 2024 The Authors. New Phytologist © 2024 New Phytologist Foundation.)
- Published
- 2024
- Full Text
- View/download PDF