| Project/Area Number |
12440214
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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 |
遺伝
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| Research Institution | Okazaki National Research Institutes |
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Principal Investigator |
TSUKAYA Hirokazu Okazaki National Research Institutes Ph.D. assistant prf, 統合バイオサイエンスセンター, 助教授 (90260512)
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| Co-Investigator(Kenkyū-buntansha) |
HORIGUCHI Gorou Okazaki National Research Institutes Ph.D., 統合バイオサイエンスセンター, 助手 (70342847)
KIM Gyung-Tae Okazaki National Research Institutes Ph.D. assistant
TSUKAYA Hirokazu Okazaki National Research Institutes Ph.D.
キム キョンテ (金 ぎよん泰) 岡崎国立共同研究機構, 統合バイオサイエンスセンター, 助手 (00321844)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥15,400,000 (Direct Cost: ¥15,400,000)
Fiscal Year 2002: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2001: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2000: ¥7,800,000 (Direct Cost: ¥7,800,000)
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| Keywords | Arabidopsis / Developmental Genetics / Leaf morphogenesis / Molecular Genetics / PIant-specific genes / Polarity / 植物特異的遺伝子群 / 形態形成 / 葉形態 / 分子メカニズム / 遺伝子 / 細胞伸長 |
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| Research Abstract |
The leaf is the fundamental unit of shoot morphogenesis and the leaf shepe is controlled physiologically (Nakaya et al. 2002 ; Tsukaya et al. 2002 ; 2000). We have accumulated much evidence that a decrease in the number of leaf cells can be compensated for by an increase in the volume of each cell. Such compensation is known only for leaf morphogenesis (reviewed in Tsukaya 2002 ; 2003). The presence of such a compensatory system does not necessarily invalidate Cell Theory ; it requires only a slight modification of Cell Theory. The modified Neo-Cell Theory fully explains the morphogenesis of leaves.
Focusing on the genetic analysis of leaf morphogenesis, in the course of this research project, we have proven that the polarized growth of leaves is regulated via genetic control of polar cell elongation and polar cell proliferation in Arabidopsis thaliana (L.) Heynh. Two genes act independently to regulate the polar cell elongation process in leaves : ANGUSTIFOLIA (AN), a homolog of animal CtBP, regulates leaf width and ROTUNDIFOLIA3 (ROT3), a cytochrome P450 gene, regulates leaf length (Tsukaya et al. 1994, Tsuge et al. 1996, Kim et al 1998, 1999, 2002). Based on molecular genetic data on AN and ROT3, we have revealed that polar leaf expansion is regulated by plant-specific gene families. We also revealed new plant-specific regulatory genes of KNOX expression, namely, AS2 and BOP (Ha et al. 2003 ; Iwakawa et al. 2002 ; Semiarti et al. 2001).
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