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The Chloroplast Small Heat-shock Protein: Evidence For A General Role In Protecting Photosystem II Against Oxidative Stress And Photoinhibition
C. Downs, S. L. Ryan, S. Heckathorn
Published 1999 · Biology
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Summary We have recently shown that the chloroplast small heat-shock protein (chlpsHsp) protects oxygen evolution and electron transport of Photosystem II during heat stress, but it is not known if the chlpsHsp protects Photosystem 11 during other stresses. Here we show that the chlpsHsp was produced in vivo in leaves of Chenopodium album (L.) and Lycopersicum esculentum (Mill.) plants subjected to drought (in high light, but not in low light), ultraviolet -A radiation, exogenous abscisic acid treatment, and oxidative stress (induced by methyl viologen). Cold-shock treatment failed to induce the chlpsHsp in either species. Using an in vitro antibody-inhibition assay specific to the chlpsHsp, we provide evidence that the chlpsHsp can protect Photosystem 11 electron transport from oxidative stress (induced by H 2 O 2 ) and under conditions of photoinhibitory high light. These results indicate that the chlpsHsp plays a general role in the protection of Photosystem II against oxidative stress and photoinhibition.
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