Fundamental study on ecological interactions between neighboring plants under artificial lighting

2015 Fiscal Year Final Research Report

• Project/Area Number: 25660199
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Agricultural environmental engineering/Agricultural information engineering
• Research Institution: Osaka Prefecture University
• Principal Investigator: Shibuya Toshio 大阪府立大学, 生命環境科学研究科(系), 准教授 (50316014)
• Co-Investigator(Kenkyū-buntansha): ENDO Ryosuke 大阪府立大学, 生命環境科学研究科, 助教 (10409146)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 光環境応答 / 個体群生態学 / 避陰反応 / 苗生産

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.

Free Research Field

生物環境調節学