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| 著者 | Izawa, T., T. Oikawa, N. Sugiyama, T. Tanisaka, M. Yano and K. Shimamoto | |
| タイトル | Phytochrome mediates the external light signal to repress FT orthologs in photoperiodic flowering of rice. | |
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Abstract: Phytochromes confer the photoperiodic control of flowering in rice (Oryza sativa), a short-day plant. To better understand the molecular mechanisms of day-length recognition, we examined the interaction between phytochrome signals and circadian clocks in photoperiodic-flowering mutants of rice. Monitoring behaviors of circadian clocks revealed that phase setting of circadian clocks is not affected either under short-day (SD) or under long-day (LD) conditions in a phytochrome-deficient mutant that shows an early-flowering phenotype with no photoperiodic response. Non-24-hr-light/dark-cycle experiments revealed that a rice counterpart gene of Arabidopsis CONSTANS (CO), named PHOTOPERIOD SENSITIVITY 1 (Heading date 1) [SE1 (Hd1)], functions as an output of circadian clocks. In addition, the phytochrome deficiency does not affect the diurnal mRNA expression of SE1 upon floral transition. Downstream floral switch genes were further identified with rice orthologs of Arabidopsis FLOWERING LOCUS T (FT). Our RT-PCR data indicate that phytochrome signals repress mRNA expression of FT orthologs, whereas SE1 can function to promote and suppress mRNA expression of the FT orthologs under SD and LD, respectively. This SE1 transcriptional activity may be posttranscriptionally regulated and may depend on the coincidence with Pfr phytochromes. We propose a model to explain how a short-day plant recognizes the day length in photoperiodic flowering. |
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| 掲載誌 | Genes Dev. | |
| Country | Japan | |
| 刊数 | 16 | |
| ページ | 2006-2020 | |
| 発刊年 | 2002 | |
| PubMed ID | 12154129 | |
| PubMed Central ID | - | |
| DOI | 10.1101/gad.999202 | |
| URL | - | |
| 関連情報 | ||
| 遺伝子 | FTL1 FTL4 FTL5 FTL6 FTL7 FTL8 HD3A RFT1 SE1 SE5 | |
| INSD | - | |
| 系統 |
野生イネ コアコレクション |
- |
| 突然変異系統(遺伝研 Collection) | - | |
| 種子不稔系統 | - | |
| 致死変異体系統 | - | |
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組織別発生段階 - 突然変異系統(遺伝子) |
- | |
| 栽培イネ品種(遺伝研 Collection) | - | |
| 組織別発生段階 | - | |
