Abstract
In higher plants, circadian clock controls various biological processes including organ growth. Mutations of circadian clock components often alter organ size, but the mechanism on the clock-controlled regulation of organ size has remained unclear.
We have focused on the analysis of the Arabidopsis lhy;cca1 mutants that have a semi-dwarf phenotype under continuous light (LL). We found that the small leaf area observed in LL-grown lhy;cca1 plants is probably caused by reduced cell growth.To understand roles of circadian clock in the control of organ size, we analyzed the ploidy levels in clock mutants including lhy;cca1. Furthermore, we screened for suppressors of the dwarf phenotype of lhy;cca1. The mechanisms that underlie the dwarf phenotype in lhy;cca1 will be discussed in more detail.
