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Heat-induced down-regulation of photosystem II protects photosystem I in honeysuckle (Lonicera japonica)

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Abstract

Honeysuckle (Lonicera japonica Thunb.) is a traditional medicinal plant in China which is often threatened by high temperature at midday during summer. Heat-induced effects on the photosynthetic apparatus in honeysuckle are associated with a depression of the photosystem II (PSII) photochemical efficiency. However, very limited information is available on regulation of photosynthetic electron flow in PSI photoprotection in heat-stressed honeysuckle. Simultaneous analyses of chlorophyll fluorescence and the change in absorbance of P700 showed that energy transformation and electron transfer activity in PSII decreased under heat stress, but the fraction of photo-oxidizable PSI (Pm) remained stable. With treatments at 38 and 42 °C, the photochemical electron transport in PSII was suppressed, whereas the cyclic electron flow (CEF) around PSI was induced. In addition, the levels of high energy state quenching (qE) and P700 oxidation increased significantly with increasing temperature. However, a decline of qE in antimycin A (AA)- or 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU)-treated leaves after heat treatment was observed, while P700 oxidation decreased only in the presence of AA. The results indicate that heat-induced inhibition of PSII and induction of CEF cooperatively protect PSI from ROS damages through moderate down-regulation of photosynthetic electron flow from PSII to PSI.

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities (No. BLX201803) and National Natural Science Foundation of China (No. 32001348).

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  1. Ying Jiang and Xin Feng contributed equally to this work.

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  1. Key Laboratory of Forest Silviculture and Conservation of the Ministry of Education, The College of Forestry, Beijing Forestry University, Beijing, 100083, China

    Ying Jiang, Xin Feng, Yuqing Chen & Yongjiang Sun

  2. College of Horticulture, Northwest Agriculture and Forestry University, Yangling, Xianyang, 712100, China

    Hui Wang

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Jiang, Y., Feng, X., Wang, H. et al. Heat-induced down-regulation of photosystem II protects photosystem I in honeysuckle (Lonicera japonica). J Plant Res 134, 1311–1321 (2021). https://doi.org/10.1007/s10265-021-01336-x

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