Determination of optimum red and blue lighting conditions for production of red-leaf lettuce cultured under LEDs

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  • レッドリーフレタス生産に適した赤色と青色発光ダイオードの光混合条件の検討
  • レッドリーフレタス セイサン ニ テキシタ アカイロ ト アオイロ ハッコウ ダイオード ノ ヒカリ コンゴウ ジョウケン ノ ケントウ

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Abstract

The aim of this study was to investigate optimum lighting conditions for growing red-leaf lettuce with commercial-grade fresh weight using red and blue light-emitting diodes (LEDs). Red-leaf lettuce plants were grown hydroponically for 21 d under 50, 100, 150, and 200μmol m-2 s-1 of red light (R) from red LEDs and blue light (B) from blue LEDs, respectively. Combinations of R and B with previously described intensities were also examined to give a total of 24 treatments. The effects of light quality and light intensity on the growth of red-leaf lettuce were investigated. Shoot fresh weight and dry weight increased as light intensity increased, regardless of light quality, with the highest rate of increase in both fresh and dry weights obtained under R. Red-leaf lettuce plants with commercial-grade fresh weight (› 80 g) could only be obtained in plants cultivated under 150 and 200μmol m-2 s-1 of R. Compared to R alone, the decrease in shoot biomass observed under B and all combinations of R and B could be attributed to a reduction in leaf area. However, the leaves of plants grown under R showed no red or purple coloration, which is an important characteristic of commercial red-leaf lettuce. On the other hand, red-leaf lettuce cultured under 50μmol m-2 s-1 or more of B, and all combinations of R and B, showed sufficient purple coloration. The results suggested that the production of red-leaf lettuce with a commercial-grade fresh weight and suitable color characteristics could be obtained under illumination by 100-200μmol m-2 s-1 of R and less than 50μmol m-2 s-1 of B.

Journal

  • Shokubutsu Kankyo Kogaku

    Shokubutsu Kankyo Kogaku 27 (1), 24-32, 2015

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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