抄録
LHY and CCA1 play key roles in the control of circadian rhythms and flowering time in Arabidopsis. Flowering time is also regulated by both floral activators and repressors such as SVP, FLC and MAF1-5. During a process of characterization of i) lhy;cca1 obtained by crosses between lhy mutants (lhy-11, 12 and 13) in Ler and cca1-1 in Ws, we found increase of FLC, decrease of MAF3-5 and mis-splicing of MAF2 in lhy-11;cca1-1 (Ler/Ws), compared to controls. Similar phenotype was observed in lhy-21;cca1-11 (Ws) but not in lhy-12;cca1-101 (Ler). These suggest that LHY, CCA1 and an unidentified factor with a natural variation between Ler and Ws may play important roles in the control of MAF2-5 and FLC. pta7 enhanced the late flowering of lhy-12;cca1-101 under LL. Loss-of-function of a PTA7-interactor 1 (IF1) like gene (IFL1), is reported to show an opposite phenotype to that in lhy-11;cca1-1: decrease of FLC and increase of MAF2-5 expression. A region responsible for the phenotypic difference between lhy-12;ca1-101 (Ler) and lhy-21;cca1-11 (Ws) has been mapped. Possible roles of LHY, CCA1, IF1 and IFL1 in the control of expression of MAF2-5 and FLC will be discussed in this presentation.
