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Zusammenfassung:
Flowering time is controlled by environmental signals such as light and temperature, and by endogenous cues such as hormone levels and sensitivity. Molecular-genet- ic studies in Arabidopsis have focused on photoperiodic regulation and vernalization. Yet, ambient growth tem- perature has been largely ignored. We have found that genes of the autonomous pathway, previously thought only to act independently of the environment as regu- lators of the floral repressor FLC are involved in medi- ating the effects of ambient temperature. In contrast to wild-type plants, and mutants in other pathways, fca and fve mutants flower at the same time regardless of ambi- ent temperature. As with vernalization and photoperiod, ambient temperature ultimately affects expression of the floral pathway integrator FT. In contrast, the exaggerated respose to temperature of cryptochrome2 mutants is probably caused by temperature-dependent redundancy with the phytochrome A photoreceptor.
