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Progesterone increases photochemical efficiency of photosystem II in wheat under heat stress by facilitating D1 protein phosphorylation

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Photosynthetica

Abstract

Experiments were conducted to investigate the effects of exogenous progesterone on photochemical efficiency of PSII and turnover of D1 protein under heat stress during the grain-filling stage. Heat stress resulted in increases of hydrogen peroxide production, malondialdehyde content, and relative electrolytic leakage in wheat leaves, but these responses were alleviated by foliar application of progesterone. Meanwhile, activities of superoxide dismutase, catalase, and peroxidase were significantly improved in progesterone-pretreated leaves. Along with the alleviation of oxidative stress, higher abundances of STN8 and phosphorylated D1 protein and lower total D1 protein content in the PSII reactive center were observed in progesterone-pretreated leaves relative to controls. Consequently, progesterone raised the potential photochemical efficiency, actual photochemical efficiency, and electron transfer rate. These results indicate that foliar application of progesterone can effectively alleviate heat-induced PSII damage by enhancing antioxidant capability and regulating phosphorylation of D1 protein in wheat leaves.

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Abbreviations

CAT:

catalase

Chl:

chlorophyll

ETR:

electron transfer rate

Fo :

minimal fluorescence yield of the dark-adapted state

Fm :

maximal fluorescence yield of the dark-adapted state

Fm':

maximal fluorescence yield of the light-adapted state

Ft :

steady-state fluorescence

Fv :

variable fluorescence

Fv/Fm :

maximal quantum yield of PSII photochemistry

MDA:

malondialdehyde

MSH:

mammalian sex hormone

POD:

peroxidase

REC:

relative electrical conductivity

ROS:

reactive oxygen species

SDS:

sodium dodecyl sulfate

SOD:

superoxide dismutase

ФPSII :

effective quantum yield of PSII photochemistry

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Correspondence to H. J. Zhao.

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Acknowledgements: This research was supported by the fund of the State Key Laboratory of Wheat and Maize Crop Science (SKL2014KF-06) and Agricultural Science and Technology Research Project of Henen Province, China (132102110125).

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Xue, R.L., Wang, S.Q., Xu, H.L. et al. Progesterone increases photochemical efficiency of photosystem II in wheat under heat stress by facilitating D1 protein phosphorylation. Photosynthetica 55, 664–670 (2017). https://doi.org/10.1007/s11099-016-0681-0

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  • DOI: https://doi.org/10.1007/s11099-016-0681-0

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