| Project/Area Number |
10559012
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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 | 展開研究 |
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| Research Field |
広領域
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| Research Institution | NAGOYA UNIVERSITY |
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Principal Investigator |
YAMAGUCHI Junji Nagoya University, BioScience Center, Associate Professor, 生物分子応答研究センター, 助教授 (10183120)
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| Co-Investigator(Kenkyū-buntansha) |
NEMOTO Keisuke The University of Tokyo, Asian Natural Environmental Science Center, Associate Professor, アジア生物資源環境研究センター, 助教授 (40211461)
YAMAMOTO Ryoichi Tezukayama College, Food Sciences Course, Professor, 食品科学, 教授 (10047384)
TANIMOTO Eiichi Nagoya City University, Institute of Natural Sciences, Professor, 自然科学研究教育センター, 教授 (90080283)
YAMAGUCHI Hiroshi 株式会社山電, 技術部・主任研究員
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥13,100,000 (Direct Cost: ¥13,100,000)
Fiscal Year 1999: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 1998: ¥8,000,000 (Direct Cost: ¥8,000,000)
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| Keywords | Creep mater / Windows computer / Gibberellin / Cell extension / Cell wall extensibility / Rice (Oryza) / dwarf mutant / イネ / 細胞壁 / 伸展曲線 / 葉鞘 / 稈 / エンドウ / ヘミセルロース |
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| Research Abstract |
We attempted to improve creep mater to estimate physical properties, which are major factors for plant morphogenesis. We also attempted to establish physical model to adapt cell wall loosening.
The mechanism of gibberellin (GA) -induced leaf sheath growth was examined using a dwarf mutant of rice (Oryza sativa L. cv. Tan-ginbozu) treated in advance with an inhibitor of GA biosynthesis. Gibberellic acid (GA) enhanced the growth of the second leaf sheath, but auxins did not. Measurement of the mitotic index and cell size revealed that cell elongation rather than cell division is promoted by GA. GA increased the extensibility of cell walls in the elongation zone of the leaf sheath. It also increased the total amount of osmotic solutes including sugars in the leaf sheath, but did not increase the osmotic concentration of the cell sap, due to accompanying increase in cell volume by water absorption. In the later stage of GA-induced growth, starch granules completely disappeared from leaf sheath cells, whereas dense granules remained in control plants. These findings indicate that GA enhances cell elongation by increasing wall extensibility, osmotic concentration being kept unchanged by starch degradation.
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