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Abstract: Objective: To evaluate the possible photoprotection mechanisms of cyclic and linear electron flux (CEF and LEF) under specific high temperature and high light (HH) stress. Methods: Six-leaf-stage tomato seedlings (“Liaoyuanduoli”, n=160) were divided into four parts: Part 1, served as control under 25 °C, 500 µmol/(m²·s); Part 2, spayed with distilled water (H₂O) under 35 °C, 1000 µmol/(m²·s) (HH); Part 3, spayed with 100 µmol/L diuron (DCMU, CEF inhibitor) under HH; Part 4, spayed with 60 µmol/L methyl viologen (MV, LEF inhibitor) under HH. Energy conversion, photosystem I (PSI), and PSII activity, and trans-thylakoid membrane proton motive force were monitored during the treatment of 5 d and of the recovering 10 d. Results: HH decreased photochemical reaction dissipation (P) and the maximal photochemical efficiency of PSII (F_v/F_m), and increased the excitation energy distribution coefficient of PSII (β); DCMU and MV aggravated the partition imbalance of the excitation energy (γ) and the photoinhibition degree. With prolonged DCMU treatment time, electron transport rate and quantum efficiency of PSI (ETR_I and Y_I) significantly decreased whereas acceptor and donor side limitation of PSI (Y_NA and Y_ND) increased. MV led to a significant decline and accession of yield of regulated and non-regulated energy Y_NPQ and Y_NO, respectively. Membrane integrity and ATPase activity were reduced by HH stress, and DCMU and MV enhanced inhibitory actions. Conclusions: The protective effects of CEF and LEF were mediated to a certain degree by meliorations in energy absorption and distribution as well as by maintenance of thylakoid membrane integrity and ATPase activity.

线性电子传递和环式电子传递对缓解番茄亚高温强光胁迫的响应

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