Ehd1, a B-type response regulator in rice, confers short-day promotion of flowering and controls FT-like gene expression independently of Hd1

Kazuyuki Doi, Takeshi Izawa, Takuichi Fuse, Utako Yamanouchi, Takahiko Kubo, Zenpei Shimatani, Masahiro Yano, Atsushi Yoshimura

Research output: Contribution to journalArticlepeer-review

546 Citations (Scopus)

Abstract

Two evolutionarily distant plant species, rice (Oryza sativa L.), a short-day (SD) plant, and Arabidopsis thaliana, a long-day plant, share a conserved genetic network controlling photoperiodic flowering. The orthologous floral regulators-rice Heading date 1 (Hd1) and Arabidopsis CONSTANS (CO)-integrate circadian clock and external light signals into mRNA expression of the FLOWERING LOCUS T (FT) group floral inducer. Here, we report that the rice Early heading date 1 (Ehd1) gene, which confers SD promotion of flowering in the absence of a functional allele of Hd1, encodes a B-type response regulator that might not have an ortholog in the Arabidopsis genome. Ehd1 mRNA was induced by 1-wk SD treatment, and Ehd1 may promote flowering by inducing FT-like gene expression only under SD conditions. Microarray analysis further revealed a few MADS box genes downstream of Ehd1. Our results indicate that a novel two-component signaling cascade is integrated into the conserved pathway in the photoperiodic control of flowering in rice.

Original languageEnglish
Pages (from-to)926-936
Number of pages11
JournalGenes and Development
Volume18
Issue number8
DOIs
Publication statusPublished - Apr 15 2004

All Science Journal Classification (ASJC) codes

  • Genetics
  • Developmental Biology

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