title: Effects of cucumber mosaic virus infection on electron transport and antioxidant system in chloroplasts and mitochondria of cucumber and tomato leaves.
abstract: We examined the responses of the photosynthetic and respiratory electron transport and antioxidant systems in cell organelles of cucumber (Cucumis sativus L.) and tomato (Lycopersicon esculentum Mill.) leaves to infection of cucumber mosaic virus (CMV) by comparing the gas exchange, Chl fluorescence, respiratory electron transport, superoxide dismutase (SOD, EC 1.15.1.1) and ascorbate-glutathione (AsA-GSH) cycle enzymes and the production of H(2)O(2) in chloroplasts, mitochondria and soluble fraction in virus-infected and non-infected leaves. Long-term CMV infection resulted in decreased photosynthesis and respiration rates. Photosynthetic electron flux to carbon reduction, respiratory electron transport via both complex I and complex II and also the Cyt respiration rate all significantly decreased, while photosynthetic alternative electron flux and alternative respiration significantly increased. These changes in electron transport were accompanied by a general increase in the activities of SOD/AsA-GSH cycle enzymes followed by an increased H(2)O(2) accumulation in chloroplasts and mitochondria. These results demonstrated that disturbance of photosynthetic and respiratory electron transport by CMV also affected the antioxidative systems, thereby leading to oxidative stress in various organelles.
authors.affiliation: Department of Horticulture, Zhejiang University, Hangzhou, China.
authors.forename: Xing-Shun
authors.initials: XS
authors.lastname: Song
authors.forename: Yan-Jie
authors.initials: YJ
authors.lastname: Wang
authors.forename: Wei-Hua
authors.initials: WH
authors.lastname: Mao
authors.forename: Kai
authors.initials: K
authors.lastname: Shi
authors.forename: Yan-Hong
authors.initials: YH
authors.lastname: Zhou
authors.forename: Salvador
authors.initials: S
authors.lastname: Nogués
authors.forename: Jing-Quan
authors.initials: JQ
authors.lastname: Yu
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism; D002736:Chloroplasts / Q000378:metabolism*; D018553:Cucumis sativus / Q000378:metabolism / Q000821:virology*; D017799:Cucumovirus / Q000472:pathogenicity*; D004579:Electron Transport; D005453:Fluorescence; D006861:Hydrogen Peroxide / Q000378:metabolism; D018551:Solanum lycopersicum / Q000378:metabolism / Q000821:virology*; D008928:Mitochondria / Q000378:metabolism*; D018384:Oxidative Stress; D010788:Photosynthesis; D010935:Plant Diseases / Q000821:virology; D018515:Plant Leaves / Q000378:metabolism / Q000821:virology; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D002734:Chlorophyll; D006861:Hydrogen Peroxide; D013482:Superoxide Dismutase