Intensity Dependence of the Growth Promotion of Cucumber Seedlings by Supplemental Blue-Lighting at Morning Twilight.

DOI Web Site 3 Citations 16 References

Bibliographic Information

Other Title
  • 日の出前の青色光補光によるキュウリ苗の成長促進に及ぼす照射強度の影響
  • ヒノデマエ ノ セイショクコウ ホコウ ニヨル キュウリ ナエ ノ セイチョウ

Search this article

Abstract

Cucumber (Cucumis sativus L. cv. Naoyosi) plants were grown hydroponically at air temperatures of 28/24°C (D/N) and 300 μmol m-2 s-1 PPFD, in a walk-in type growth cabinet equipped with 3-band fluorescent lamps. At 10, 30, 100, 200 μmol m-2 s-1 PPFD, supplemental blue-lighting was applied daily for 5min just before the 14h photoperiod (morning twilight).<BR>Growth parameters were measured after 7 and 14 days of treatment. After 13 days of treatment, the stomatal conductance, transpiration rate and photosynthetic rate were measured under 3-band fluorescent lamps at a PPFD of 300 μmol m-2 s-1. At 12-14 days of treatment, changes in photosynthetic rate were measured continuously for 30 minutes, after the end of supplemental blue-lighting.<BR>Dry weight, leaf area, stem diameter of plants were the greatest with blue-lighting at 30 μmol m-2 s-1 PPFD. The stomatal conductance, transpiration rate and photosynthetic rate after 13days of treatment were greatest in the plants grown with supplemental blue light at 30 and 100 μmol m-2 s-1 PPFD. The photosynthetic rate at 30 μmol m-2 s-1 PPFD increased by 23% as compared with that of control plants grown without supplemental lighting. Continuous measurements showed photosynthetic rate to rise, and the high level was maintained with 30 μmol m-2 s-1 PPFD blue-lighting treatment.<BR>These results indicate that the promotion of plant growth by supplemental blue-lighting at morning twilight is dependent on the lighting intensity.

Journal

  • Shokubutsu Kojo Gakkaishi

    Shokubutsu Kojo Gakkaishi 9 (4), 271-277, 1997

    JAPANESE SOCIETY OF AGRICULTURAL, BIOLOGICAL AND ENVIRONMENTAL ENGINEERS AND SCIENTISTS

Citations (3)*help

See more

References(16)*help

See more

Details 詳細情報について

Report a problem

Back to top