Genetic Analysis of Clock-Associated Mutants in Arabidopsis

Abstract

Photoperiodic control of flowering is regulated by light and a circadian clock. We have shown that two Myb related transcription factors, LHY and CCA1, are involved in regulation of circadian rhythms and flowering time. Here we show that GI, CO, FT, SOC1 and FHA/CRY2 play important roles in regulation of flowering time in the downstream of circadian clock components, LHY and CCA1. We also demonstrate characterization of two dominant late flowering mutants, lhy-2 (late elongated hypocotyl-2) and dll1 (dominant late flowering under long days 1), and an enhancer mutant of lhy cca1, elc1 (enhancer of early flowering of lhy cca1 1).
Phosphorylation plays important roles in control of clock components. We are screening RIKEN Arabidopsis Transposon mutants to identify kinase genes involved in regulation of flowering and circadian rhythms. We will report current results and discuss possible mechanisms how the kinases may function in the processes of our interests.