数字农科院2.0

Ser/Thr Protein Kinase SpkI Affects Photosynthetic Efficiency in Synechocystis sp. PCC 6803 upon Salt Stress

文献类型： 外文期刊

作者： Wang, Xiaoting;Ge, Haitao;Zhang, Ye;Wang, Yingchun;Zhang, Pengpeng

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关键词： photosystem II;photosynthesis;salt-stress;Ser;Thr protein kinase;Synechocystis

期刊名称： LIFE-BASEL

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年卷期： 2022 年 12 卷 5 期

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摘要： High salinity is a common environmental factor that limits productivity and growth for photosynthetic organisms. Here, we identified a mutant defected in gene sll1770, which encodes a Ser/Thr protein kinase SpkI, with a significantly low maximal quantum yield of PSII under high salt condition in Synechocystis sp. PCC 6803. Physiological characterization demonstrated that the Delta spkI mutant had normal growth and photosynthesis under control condition. And a significantly higher NPQ capacity was also observed in Delta spkI when grown under control condition. However, when grown under high salt condition, Delta spkI exhibited apparently slower growth as well as decreased net photosynthesis and PSII activity. Western blot analysis demonstrated that the amount of major photosynthetic proteins declined sharply in Delta spkI when cells grown under high salt condition. Redox kinetics measurement suggested that the activities of PSI and cytochrome b(6)f complex were modified in Delta spkI under high salt condition, which resulted in a more reduced PQ pool in Delta spkI. Chlorophyll fluorescence traces suggested that the O-A(-) reoxidation and state transition was also impaired in Delta spkI under high salt condition. Above all, we propose that Ser/Thr protein kinase SpkI plays a role in maintaining high-effective photosynthesis during high-salt acclimation process in Synechocystis.

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