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In this study, we investigated the effects of exogenous calcium nitrate on photoinhibition and thylakoid protein level in peanut plants under heat(40 °C) and high irradiance(HI)(1,200 m mol/m2 per s) stress. Compared with control seedlings(cultivated in 0 mmol/L Ca(NO3)2medium),the maximal photochemical ef ficiency of photosystem II(PSII)in Ca2t-treated plants showed a slight decrease after 5 h stress,accompanied by lower degree of PSII closure(1-q P), higher non-photochemical quenching, and lower level of membrane damage. Ca2 t inhibitors were used to analyze the varieties of antioxidant enzymes activity and PSII proteins. These results indicated that Ca2 t could protect the subunits of PSII reaction centers from photoinhibition by reducing the generation of reactive oxygen species. In the presence of both ethyleneglycol-bis(2-aminoethylether)-tetraacetic acid and ascorbic acid(As A), the net degradation of the damaged D1 protein was faster than that only treated with As A. Our previous study showed that either the transcriptional or the translational level of calmodulin was obviously higher in Ca2t-treated plants. These results suggested that, under Researh eat and HI stress, the Ca2 t signal transduction pathway can alleviate the photoinhibition through regulating the protein repair process besides an enhanced capacity for scavenging reactive oxygen species.
In this study, we investigated the effects of exogenous calcium nitrate on photoinhibition and thylakoid protein level in peanut plants under heat (40 ° C) and high irradiance (HI) (1,200 m mol / m2 per s) stress. Compared with control seedlings cultivated in 0 mmol / L Ca (NO3) 2medium, the maximal photochemical ef ficiency of photosystem II (PSII) in Ca2t-treated plants showed a slight decrease after 5 h stress, accompanied by lower degree of PSII closure (1-q P ), higher non-photochemical quenching, and lower level of membrane damage. Ca2 t inhibitors were used to analyze the varieties of antioxidant enzymes activity and PSII proteins. These results indicated that Ca2 t could protect the subunits of PSII reaction centers from photohibition by reducing the generation of reactive oxygen species. In the presence of both ethyleneglycol-bis (2-aminoethylether) -tetraacetic acid and ascorbic acid (As A), the net degradation of the damaged D1 protein was faster than that only treated with As A. Our previ ous study showed that either the transcriptional or the translational level of calmodulin was obviously higher in Ca2t-treated plants. These results suggest that, under Researh eat and HI stress, the Ca2 t signal transduction pathway can alleviate the photoinhibition through regulating the protein repair process besides an enhanced capacity for scavenging reactive oxygen species.