| Project/Area Number |
04404015
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
農業気象・生物環境制御学
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| Research Institution | Chiba University |
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Principal Investigator |
KOZAI Toyoki Chibe University, Faculty of Horticulture, Professor, 園芸学部, 教授 (90081570)
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| Co-Investigator(Kenkyū-buntansha) |
HAYASHI Makio Tokai University, Department of Biological Science and Technology, Associate Pro, 開発工学部, 助教授 (60092087)
TAKAGAKI Michiko Chiba University, Faculty of Horticulture, Research Associate, 園芸学部, 助手 (00206715)
ISHIKAWA Keiko Chiba University, Faculty of Horticulture, Research Associate, 園芸学部, 助手 (20212839)
FUJIWARA Kazuhiro Chiba University, Faculty of Horticulture, Associate Professor, 園芸学部, 助教授 (30211535)
KITAYA Yoshiaki Chiba University, Faculty of Horticulture, Associate Professor, 園芸学部, 助教授 (60169886)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥29,000,000 (Direct Cost: ¥29,000,000)
Fiscal Year 1994: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 1992: ¥20,000,000 (Direct Cost: ¥20,000,000)
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| Keywords | growth / light emitting diode / lighting system / micropropagation / morphology / optical fiber / photosynthetically active radiation / potato / プラグ苗 / 人工環境 / 照明 / 光ファイバ / 光強度 / 明期時間 / CO_2濃度 / レタス / LED / 苗生産 / 光合成有効光量子束密度 |
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| Research Abstract |
A prototype sideward lighting system using diffusive optical fibers was developed for enhanced energy and space efficiencies. In this system, only photosynthetically active radiation is released from the optical fibers to plantlets. Growth of potato plantlets micropropagated in the sideward lighting system was compared to that in the conventional downward lighting system. Plantlets micropropagated in the sideward lighting system had significantly shortened stems while gaining increased dry weight, leaf area, all of which are preferred characteristics of micropropagated plantlets for acclimatization to ex vitro conditions.
Plantlet growth and morphology were controlled by modifying red (R) and far-red (FR) photon flux densities with red and far-red light emitting diodes as supplemental light sources. Shoot length of potato plantlets decreased with increasing R/FR ratio.
Sideward lighting system with diffusive optical fibers and LEDs was a usuful lighting system to effectively control the growth and morphology of plantlets in micropropagation.
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