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

• Kazuyuki Doi

• Takeshi Izawa

• Takuichi Fuse

• Utako Yamanouchi

• Takahiko Kubo

• Zenpei Shimatani

• Masahiro Yano

• Atsushi Yoshimura

抄録

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.

収録刊行物

• Genes & Development

  Genes & Development 18 (8), 926-936, 2004-04-12

  Cold Spring Harbor Laboratory

キーワード

• Developmental Biology
• Genetics

詳細情報

• CRID: 1361137045858555648
• NII論文ID: 30018918631
• DOI: 10.1101/gad.1189604
• ISSN: 15495477
• ISSN: 08909369
• ISSN: http://id.crossref.org/issn/08909369
• Web Site: https://syndication.highwire.org/content/doi/10.1101/gad.1189604
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