Abstract
In plants, the elongation of pedicels and stem internodes produce a highly ordered branching pattern. We have reported corymb-like inflorescence mutations, corymbosa1 (crm1)/big. The CRM1/BIG gene regulates the cell elongation of pedicels and stem internodes through auxin action. To gain new insight into inflorescence development, we screened enhancer and suppresser mutants of crm1. A leafy (lfy) mutaion, was found to be one of the suppressor mutation. Temporal expression analysis revealed that the expression level of LFY in crm1-1 was increased in late developmental stage. We found that pedicels in 35S::LFY-GR treated with DEX during late developmental stage pointed downwards. These results suggest that the corymb-like phenotype in crm1 is partially caused by the later overexpression of LFY that defines the elongation direction of pedicels in stem development. Further analyses of relationship between LFY and CRM1/BIG will be presented.
