| Project/Area Number |
14340270
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
系統・分類
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| Research Institution | OKAZAKI NATIONAL RESEARCH INSTITUTES |
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Principal Investigator |
HASEBE Mistuyasu Okazaki National Research Institutes, National Institute for Basic Biology, Professor, 基礎生物学研究所, 教授 (40237996)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITA Tomomichi Okazaki National Research Institutes, National Institute for Basic Biology, Assistant Professor, 基礎生物学研究所, 助手 (50322631)
UEHARA Kouichi Chiba University, Faculty of Horticulture, Assistant Professor, 園芸学部, 助手 (20221799)
AOKI Seishiro University of Tokyo, Graduate School of Arts and Sciences, Assistant Professor, 大学院・総合文化研究科, 助手 (10334301)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2003: ¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 2002: ¥7,700,000 (Direct Cost: ¥7,700,000)
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| Keywords | MADS-box genes / floral organ / Nymphaea / Magnolia / Houttuynia / ABC model / homeobox genes / STM / Amborella / ハゴロモモ / 花器官形成遺伝子 / 発生進化 |
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| Research Abstract |
Expression patterns of floral homeotic gene homologs in basal angiosperms were examined to infer whether these genes function similarly to those in eudicots. Based on our results, ABC functions of floral homeotic genes were likely established at the stage of basal angiosperms. The intermediate organs between sepals and petals, named as tepals, were formed by the variation of expressions among AP3, P1 and SBP homologs. We also found that AP1 homologs in basal angiosperms were expressed more broadly than eudicot AP1 homologs, and proposed a hypothesis that the broad expression patterns are likely related to the formation of spiral flowers, which often observed in basal angiosperms. Furthermore, we found that petal-like characters of the Houttuynia flower are managed by the heterotopic expression of floral homeotic gene homologs in bracts. Together, this study showed that molecular mechanisms of flower development of eudicots similarly function in basal angiosperms, and the modifications of basic mechanisms are related to the basal-angiosperm specific flowers.
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