Lack of digalactosyldiacylglycerol increases the sensitivity of Synechocystis sp. PCC 6803 to high light stress |
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Authors: | Naoki Mizusawa |
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Institution: | Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan |
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Abstract: | The physiological role of digalactosyldiacylglycerol (DGDG) in photosynthesis was examined using a dgdA mutant of Synechocystis sp. PCC 6803 that is defective in the biosynthesis of DGDG. The dgdA mutant cells showed normal growth under low light (LL) conditions. However, their growth was retarded under high light (HL) conditions and under Ca2+- and/or Cl−-limited conditions compared to wild-type cells. The retardation in growth of the mutant cells was recovered by exogenous supply of DGDG in the growth medium. The dgdA mutant showed increased sensitivity to photoinhibition. Although both photodamage and repair processes of photosynthesis were affected, the repair process was more severely affected than the photodamage process, suggesting that DGDG plays an important role in the photosynthetic repair cycle. |
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Keywords: | DGDG digalactosyldiacylglycerol HL high light LL low light MGDG monogalactosyldiacylglycerol SQDG sulfoquinovosyldiacylglycerol PG phosphatidylglycerol PSI photosystem I PSII photosystem II |
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