<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>
抄録
<jats:p>Two evolutionarily distant plant species, rice (<jats:italic>Oryza sativa</jats:italic> L.), a short-day (SD) plant, and <jats:italic>Arabidopsis thaliana</jats:italic>, a long-day plant, share a conserved genetic network controlling photoperiodic flowering. The orthologous floral regulators—rice <jats:italic>Heading date 1</jats:italic> (<jats:italic>Hd1</jats:italic>) and <jats:italic>Arabidopsis CONSTANS</jats:italic> (<jats:italic>CO</jats:italic>)—integrate circadian clock and external light signals into mRNA expression of the <jats:italic>FLOWERING LOCUS T</jats:italic> (<jats:italic>FT</jats:italic>) group floral inducer. Here, we report that the rice <jats:italic>Early heading date 1</jats:italic> (<jats:italic>Ehd1</jats:italic>) gene, which confers SD promotion of flowering in the absence of a functional allele of <jats:italic>Hd1</jats:italic>, encodes a B-type response regulator that might not have an ortholog in the <jats:italic>Arabidopsis</jats:italic> genome. <jats:italic>Ehd1</jats:italic> mRNA was induced by 1-wk SD treatment, and <jats:italic>Ehd1</jats:italic> may promote flowering by inducing <jats:italic>FT-like</jats:italic> gene expression only under SD conditions. Microarray analysis further revealed a few MADS box genes downstream of <jats:italic>Ehd1</jats:italic>. Our results indicate that a novel two-component signaling cascade is integrated into the conserved pathway in the photoperiodic control of flowering in rice.</jats:p>
収録刊行物
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- Genes & Development
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Genes & Development 18 (8), 926-936, 2004-04-12
Cold Spring Harbor Laboratory
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詳細情報 詳細情報について
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- CRID
- 1361137045858555648
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- NII論文ID
- 30018918631
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- ISSN
- 15495477
- 08909369
- http://id.crossref.org/issn/08909369
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