A thermosensory pathway controlling flowering time in Arabidopsis thaliana

Miguel A. Blázquez, Ji Hoon Ahn, Detlef Weigel

Research output: Contribution to journalArticlepeer-review

361 Citations (Scopus)


Onset of flowering is controlled by environmental signals such as light and temperature. Molecular-genetic studies in Arabidopsis thaliana have focused on daily light duration, or photoperiod, and transient exposure to winter-like temperatures, or vernalization. Yet ambient growth temperature, which is strongly affected by current changes in global climate2, has been largely ignored. Here, we show that genes of the autonomous pathway, previously thought only to act independently of the environment as regulators of the floral repressor FLC (ref. 1), are centrally involved in mediating the effects of ambient temperature. In contrast to wild-type plants and those mutant in other pathways, autonomous-pathway mutants flower at the same time regardless of ambient temperature. In contrast, the exaggerated temperature response of cryptochrome-2 mutants is caused by temperature-dependent redundancy with the phytochrome A photoreceptor. As with vernalization and photoperiod, ambient temperature ultimately affects expression of the floral pathway integrator FT.

Original languageEnglish
Pages (from-to)168-171
Number of pages4
JournalNature Genetics
Issue number2
Publication statusPublished - 2003 Feb 1

ASJC Scopus subject areas

  • Genetics


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