Intensity Dependence of the Growth Promotion of Cucumber Seedlings by Supplemental Blue-Lighting at Morning Twilight
Intensity Dependence of the Growth Promotion of Cucumber Seedlings by Supplemental Blue-Lighting at Morning Twilight
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晨昏补充蓝光对黄瓜幼苗促生长的强度依赖性
DOI：
10.2525/jshita.9.271
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
T. Hirano
中科院分区：
文献类型：
--
作者：
Sung Il Kyung;M. Kiyota;T. Hirano
黄瓜 (Cucumis sativus L. cv. Naoyosi) 植物在 28/24°C (D/N) 的气温和 300 μmol m-2 s-1 PPFD 的条件下，在配备 3 波段荧光灯的步入式生长柜中进行水培。在 10、30、100、200 μmol m-2 s-1 PPFD 下，每天在 14 小时光周期（晨曦）前补充蓝光 5 分钟。处理 7 天和 14 天后测量生长参数。处理13天后，在PPFD为300 μmol m-2 s-1的3波段荧光灯下测量气孔导度、蒸腾速率和光合速率。处理第12-14天，补充蓝光结束后，连续测量光合速率的变化30分钟。植物干重、叶面积、茎直径在30 μmol m-2 s-1 PPFD蓝光照射下最大。处理13天后，补充30和100 μmol m-2 s-1 PPFD蓝光的植物的气孔导度、蒸腾速率和光合速率最高。与没有补充光照的对照植物相比，30 μmol m-2 s-1 PPFD 下的光合速率提高了 23%。连续测量显示光合速率有所上升，并且在30 μmol m-2 s-1 PPFD蓝光处理下仍保持较高水平。这些结果表明，晨昏补充蓝光对植物生长的促进作用依赖于光照强度。
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).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.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.These results indicate that the promotion of plant growth by supplemental blue-lighting at morning twilight is dependent on the lighting intensity.