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ISHS Acta Horticulturae 907: VI International Symposium on Light in Horticulture

EFFECTS OF LIGHT QUALITY AND PHOTOSYNTHETIC PHOTON FLUX ON GROWTH AND CAROTENOID PIGMENTS IN SPINACH (SPINACIA OLERACEA L.)

Authors:   J. Li, S. Hikosaka, E. Goto
Keywords:   biomass, β-carotene, cultivar, irradiation level, lutein
DOI:   10.17660/ActaHortic.2011.907.12
Abstract:
We investigated the effects of light quality and photosynthetic photon flux (PPF) on spinach biomass production and carotenoid pigments. We showed that, with a PPF of 300 μmol m-2 s-1, white and/or red fluorescent lamps promoted higher dry mass accumulation in 4 spinach cultivars than did a blue fluorescent lamp. By contrast, with a PPF of 100 μmol m-2 s-1, the effect of light quality on dry mass accumulation was not significant. The leaf blade dry mass (%) was higher than the leaf stalk dry mass (%) for all treatments used. Light quality and PPF significantly affected β-carotene and lutein concentrations of spinach on a fresh and dry mass basis. We further showed that, with a PPF of 300 μmol m-2 s-1, applying a blue fluorescent lamp significantly promoted β-carotene and lutein concentrations of spinach on a fresh, and also a dry mass basis. Our results suggest that spinach biomass production and β-carotene and lutein concentrations strongly depend on the PPF. Furthermore, light quality plays a vital role when the PPF is high, but has little effect when the PPF is low.

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907_11     907     907_13

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