| Project/Area Number |
25660199
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Agricultural environmental engineering/Agricultural information engineering
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
Shibuya Toshio 大阪府立大学, 生命環境科学研究科(系), 准教授 (50316014)
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| Co-Investigator(Kenkyū-buntansha) |
ENDO Ryosuke 大阪府立大学, 生命環境科学研究科, 助教 (10409146)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 光環境応答 / 個体群生態学 / 避陰反応 / 苗生産 / 光獲得競争 |
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| Outline of Final Research Achievements |
Light competition and subsequent growth of dense plant stands were evaluated under light with different red:far-red ratios (R:FRs). The plant stands containing cucumber seedlings with different mutual shading degrees were prepared, and were grown under light with normal R:FR or high R:FR (= 11). Under normal R:FR light, differences in shading degree within individuals became non-significant within 2 days, whereas under high R:FR light, differences were preserved throughout the experimental period, indicating that the unequal competition for light exists between neighbors under high R:FR light. The initial shading degree and dry-matter accumulation of the seedlings during the experimental period were positively correlated under high R:FR light but not under normal R:FR light. The knowledge from this study that light quality affects plant growth by altering the competitive interactions among plants will provide guidance for optimizing the light conditions.
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