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Mechanism of Photoregulated Carotenogenesis in Rhodotorula minuta IV. Effect of Light on the Production of Ergosterol and Phytoene and on the Composition of Carotenoid Pigments |
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| Authors: | Tada, Mikiro Shiroishi, Masahide Hasegawa, Kiyozo Suzuki, Tetsuya Iwai, Kazuo |
| Affiliation: | 1Department of Agricultural Chemistry, Faculty of Agriculture, Okayama University Tsushima-naka, Okayama 700, Japan 2Department of Food Science and Nutrition, Nara Women's University Nara, Nara 630, Japan 3Research Institute for Food Science, Kyoto University Uji, Kyoto 611, Japan 4Department of Food Science and Technology, Faculty of Agriculture, Kyoto University Kyoto 606, Japan |
| Abstract: | The effect of light on the production of ergosterol and phytoeneand on the composition of carotenoids in Rhodotorula minutawas studied to determine which part of the pathway of carotenoidsynthesis regulated by light. The ergosterol content in the cells was in the range of 3.43.6mg/g dry cells regardless of the presence or absence of illuminationand the light intensity. The phytoene production in the cellswas markedly stimulated by light and was dependent on the lightintensity according to the amount of carotenoid pigments produced.In addition, the ratio of phytoene to carotenoid was in therange of 0.360.44, regardless of the presence or absenceof illumination and the light intensity. The fact that the ratio of carotenoid fractionated on the basisof the functional group involved in each carotenoid to the totalamount of carotenoid was almost constant regardless of the lightintensity suggested that the composition of the carotenoidssynthesized in the cells is not affected by light. It was deduced from these results that light induced the productionof enzyme(s) required for phytoene biosynthesis in Rhodotorulaminuta. (Received November 7, 1981; Accepted March 19, 1982) |
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