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Open AccessArticle10.1016/s1016-8478(23)15054-0

Differential Susceptibility of Photosynthesis to Light-chilling Stress in Rice (Oryza sativa L.) Depends on the Capacity for Photochemical Dissipation of Light

Suk Weon Jeong,Sun Mi Choi,Dong Sook Lee,Sang Nag Ahn,Yoonkang Hur,Wah Soon Chow+1 more-2002-06-01-Molecules and Cells
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TL;DRAbstract

The primary target for light-chilling stress in chilling-sensitive cucumber leaves is the chloroplast Cu,Zn-Superoxide dismutase, followed by subsequent inactivation of the photosystem (PS) I by reactive oxygen species (ROS). To test this hypothesis, two rice cultivars that were different in their ecological origins (a chilling-resistant Stejaree 45 and a chilling-sensitive Milyang 23) were evaluated with respect to photosynthetic properties, the ROS scavenging system, and expression of genes that are involved in sucrose synthesis and allocation upon the light-chilling stress. As expected, when the leaves were exposed to various low temperatures with illumination (150 micromol m(-2)s(-1)) for 6 h, the leaf photosynthesis of Milyang 23 decreased faster than that of Stejaree 45. The light-chilling induced differential photoinhibition of photosynthesis between the two cultivars was caused by the photoin-activation of PSII but not of PSI, since the potential quantum yield of PSII followed

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The primary target for light-chilling stress in chilling-sensitive cucumber leaves is the chloroplast Cu,Zn-Superoxide dismutase, followed by subsequent inactivation of the photosystem (PS) I by reactive oxygen species (ROS). To test this hypothesis, two rice cultivars that were different in their ecological origins (a chilling-resistant Stejaree 45 and a chilling-sensitive Milyang 23) were evaluated with respect to photosynthetic properties, the ROS scavenging system, and expression of genes that are involved in sucrose synthesis and allocation upon the light-chilling stress. As expected, when the leaves were exposed to various low temperatures with illumination (150 micromol m(-2)s(-1)) for 6 h, the leaf photosynthesis of Milyang 23 decreased faster than that of Stejaree 45. The light-chilling induced differential photoinhibition of photosynthesis between the two cultivars was caused by the photoin-activation of PSII but not of PSI, since the potential quantum yield of PSII followed

Keywords

PhotoinhibitionPhotosynthesisSuperoxide dismutasePhotosystem IIAPXReactive oxygen speciesChloroplastPeroxidase

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