Green light penetrates inside crisp head lettuce leading to chlorophyll and ascorbic acid content enhancement
Increasing safe and steady food production has been approached under plant factory production. Plants are often cultivated under LED which emit blue and red light regions because photosynthetic pigments strongly absorb these regions while green light region has been considered to be less effective due to its absorptance. Crisp head lettuce is an economic crop whose outer leaves have to be removed when shipping for round-shape display in a market, in spite that these removed leaves contain higher nutritional values. Effect of photosynthetic photon flux density (PPFD) of 400 µmol m‑2 s‑1 green light on chlorophyll and ascorbic acid content; and shoot biomass have been examined in crisp head lettuce by using a characteristic of lower light absorptance, but greater light transmittance in leaves. The contents are high inside the crisp head lettuce especially under green light irradiation because of the deeper light transmittance. The present study proposes an availability and integration of green light to improve plant quality even inside of the crisp head lettuce on its cultivation for a further novel cultivation system in plant factory.
Saengtharatip, S., Goto, N., Kozai, T. and Yamori, W. (2020). Green light penetrates inside crisp head lettuce leading to chlorophyll and ascorbic acid content enhancement. Acta Hortic. 1273, 261-270
hydroponic, iceberg lettuce, LED, light penetration, plant factory, soilless culture, vertical farming