A Manipulation of Air Temperature and Light Quality and Intensity can Maximize Growth and Folate Biosynthesis in Leaf Lettuce

Seibutsu kankyo chosetsu. [Environment control in biology Pub Date : 2019-04-01 DOI:10.2525/ECB.57.39

Seiichi Okazaki, Tamaki Yamashita

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引用次数: 8

Abstract

We evaluated effects of different air temperature and light quality/intensity on growth and folate biosynthesis in leaf lettuce using a plant growth cabinet with light-emitting diodes (LEDs) combining red, green and blue (RGB) lights. Leaf lettuce was cultivated under combination conditions with 3 different air temperatures (20 ℃ , 25 ℃ and 28 ℃ ) and 4 different light irradiations (photosynthetic photon flux density [PPFD] of 150 m mol m (cid:1) 2 s (cid:1) 1 [P150]/RB, P150/RGB, P200/RB and P200/RGB) for 21 days. At the end of the cultivation, growth endpoints including edible portion weight, and folate contents were examined. The results demonstrated significant effects of air temperature and light quality and intensity on lettuce growth and folate biosynthesis. Under the optimal combination condition that we identified, 25 ℃ and P200/RGB, the edible portion weight and folate contents in leaf lettuce were 15 ― 62 ％ and 83 ― 137 ％ greater, respectively, compared to any light conditions at 20 ℃ , an optimal temperature for conventionally growing leaf lettuce. Addition of green LED to red and blue LEDs maximized leaf lettuce growth and folate biosynthesis. Plant factory with optimal air temperature and light conditions utilizing RGB LED lights is a promising novel agriculture concept maximizing plant growth and critical nutrients such as folate.

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控制空气温度、光照质量和强度可以最大限度地提高叶莴苣的生长和叶酸生物合成

我们使用带有发光二极管（LED）的植物生长柜，结合红、绿、蓝（RGB）光，评估了不同空气温度和光照质量/强度对叶莴苣生长和叶酸生物合成的影响。在3种不同的空气温度（20℃、25℃和28℃）和4种不同的光照（光合光子通量密度[PPFD]为150m mol m（cid:1）2s（cid:1）1[P150]/RB、P150/RGB、P200/RB和P200/RGB）的组合条件下培养叶莴苣21天。在培养结束时，检查生长终点，包括可食用部分重量和叶酸含量。结果表明，空气温度、光照质量和强度对生菜生长和叶酸生物合成有显著影响。在我们确定的最佳组合条件下，25℃和P200/RGB，叶莴苣的可食用部分重量和叶酸含量分别比常规种植叶莴苣的最佳温度20℃的任何光照条件高出15～62%和83～137%。将绿色LED添加到红色和蓝色LED中，最大限度地提高了叶莴苣的生长和叶酸的生物合成。利用RGB LED灯实现最佳空气温度和光照条件的植物工厂是一种很有前途的新型农业概念，可以最大限度地提高植物生长和叶酸等关键营养素。

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Seibutsu kankyo chosetsu. [Environment control in biology

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