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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Environmental Science / Faculty of Environmental Earth Science >
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Common mechanisms regulating expression of rice aleurone genes that contribute to the primary response for gibberellin.
| Title: | Common mechanisms regulating expression of rice aleurone genes that contribute to the primary response for gibberellin. |
| Authors: | Washio, Kenji Browse this author →KAKEN DB | | Morikawa, Masaaki Browse this author →KAKEN DB |
| Keywords: | Aleurone | | DNA methylation | | GAMyb | | Gibberellin | | Rice | | Seed germination |
| Issue Date: | Oct-2006 |
| Publisher: | Elsevier B.V. |
| Journal Title: | Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression |
| Volume: | 1759 |
| Issue: | 10 |
| Start Page: | 478 |
| End Page: | 490 |
| Publisher DOI: | 10.1016/j.bbaexp.2006.09.001 |
| PMID: | 17052766 |
| Abstract: | During germination of cereal seeds, aleurone cells respond to gibberellins (GA) by synthesizing and secreting hydrolytic enzymes that mobilize the reserved nutrients. It has been shown that products of early GA response genes, like a transcription factor GAMyb, act as key molecules leading to this regulation. Pivotal roles of GAMyb on expression of hydrolase genes have been well documented, whereas regulation of GAMyb expression itself remains obscure. In order to understand virtual mechanisms of the GA-mediated expression of genes, it is important to know how GA control expression of early GA response genes. Using an aleurone transient expression system of rice (Oryza sativa L.), we examined GA responsive domains of early GA response genes in the aleurone, such as GAMyb and OsDof3. The 5' upstream region could not confer GA response. Extensive analyses revealed the presence of enhancer-like activities in a large first intron. In Arabidopsis, intron enhancers have been identified in MADS-box homeotic genes, AGAMOUS (AG) and FLOWERING LOCUS C (FLC), in which large introns should not only confer proper gene expressions, but also associate with gene silencing by covalent modifications of both DNA and histone. These evidences prompt us to assign that chromatin-based control might be important for initial GA action. Based on this assumption, we have identified DNA methylation of the GAMyb locus in germinated rice seeds. |
| Relation: | http://www.sciencedirect.com/science/journal/01674781 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/17176 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 鷲尾 健司
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