Abstract
Arabidopsis thaliana acaulis1-1 (acl1-1) phenotype was distinct from its allelic acl1-3 phenotype in the aspect of temperature-dependent restoration of mutant phenotype. Both exhibit growth defects in leaves and inflorescence stems at 22C and those defects are restored and acl1 plants become indistinguishable from wild-type at 28C. However, at 24C, the degree of restoration differs between acl1-1 and acl1-3. Although the acl1-3 plants elongated their inflorescence stems, the acl1-1 plants were similar to those grown at 22C.
We identified an inversion mutation in the original acl1-1 genome (Kamata and Komeda, 2008, Genes & Genetic Systems 83, 293-300). Full-length transcripts of the two genes located at each end of the inversion were not expressed. Expressions of multiple genes within the inversion were also altered. The inversion functioned as an enhancer of the acl1-1 phenotype and thus the elongation of the inflorescence stems of the original acl1-1 plants were inhibited at 24C.
