Those mutants were studied whose defects resulted in the morphological changes of inflorescences inArabidopsis thaliana. We characterized newly isolatedcorymbosa mutants andacaulis5 mutants.
Thecorymbosa1-1 mutation was caused by the defects in the elongation of pedicels and the previously identifiederecta mutation belonged to this class. Thecorymbosa2-1 mutation was caused mainly by the increase of the number of the floral buds in the inflorescence.
The expression of theERECTA gene whose defect resulted to the corymbose inflorescence was analyzed. TheERECTA gene was expressed in subsets of cells in both the peripheral zone and central zone and was thought to have important role for the development of inflorescences.
The phenotypes of theacaulis5 mutation was pronounced just after the transition from the vegetative to reproductive growth phase. We found that the expressions of the genes for EXGT-A1 and γ-TIP were drastically reduced in theacaulis5 mutants.
Acaulis5 mutation Arabidopsis thalianaCorymbosa mutation ERECTA gene Inflorescence development
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