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 journalArticle

486 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

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Gene Expression
Arabidopsis
Messenger RNA
Circadian Clocks
Microarray Analysis
Genes
Alleles
Oryza
Genome
Light

All Science Journal Classification (ASJC) codes

  • Genetics
  • Developmental Biology

Cite this

Ehd1, a B-type response regulator in rice, confers short-day promotion of flowering and controls FT-like gene expression independently of Hd1. / Doi, Kazuyuki; Izawa, Takeshi; Fuse, Takuichi; Yamanouchi, Utako; Kubo, Takahiko; Shimatani, Zenpei; Yano, Masahiro; Yoshimura, Atsushi.

In: Genes and Development, Vol. 18, No. 8, 15.04.2004, p. 926-936.

Research output: Contribution to journalArticle

Doi, Kazuyuki ; Izawa, Takeshi ; Fuse, Takuichi ; Yamanouchi, Utako ; Kubo, Takahiko ; Shimatani, Zenpei ; Yano, Masahiro ; Yoshimura, Atsushi. / Ehd1, a B-type response regulator in rice, confers short-day promotion of flowering and controls FT-like gene expression independently of Hd1. In: Genes and Development. 2004 ; Vol. 18, No. 8. pp. 926-936.
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