Abbreviations : UV, ultraviolet; HPLC, high-pressure liquid chromatography; Chl, chlorophyll; fresh W dry ratios, the ratios of the fresh weights to dry weights; DMSO, dimethyl sulfoxide Biosci. Biotechnol. Biochem., 66 (1), [65][66][67][68][69][70][71][72] 2002 To assess eŠects of the environmental stress on polyphenol compounds (polyphenols) in plants, the polyphenol contents were investigated in the seedlings of saOEower (Carthamus tinctrius L.) and cucumber (Cucumis sativus L.) grown under three types of growth conditions: control; light stress, irradiated with strong light in the visible wavelength range; and light W water stress, irradiated with strong visible light with a limited water supply. The total polyphenol contents and the amounts of the major polyphenols, especially luteolin 7-Oglucoside in saOEower cotyledons, and luteolin 7-Oglucoside and luteolin in saOEower foliage leaves, increased in response to both stresses. The polyphenol increasing eŠect of light W water stress was clearly observed in saOEower compared to cucumber, suggesting that plants that are resistant to these stresses can accumulate substantial amounts of polyphenols compared to the plants which respond weakly to the stresses.

Abbreviations : DMSO, dimethyl sulfoxide; freshW dry ratio, the ratio of the fresh weight to dry weight; HPLC, high-performance liquid chromatography

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