高温干旱复合胁迫抑制夏玉米光系统Ⅱ性能降低籽粒产量

doi:10.3864/j.issn.0578-1752.2024.21.004

Abstract

Abstract:

【Objective】This study aimed to explore the underlying reasons for the reduction of maize photosynthesis under the high temperature and drought combined stress, so as to provide theoretical basis for alleviating the combined stress of high temperature and drought. 【Method】Maize cultivar “Denghai 605” was selected as the experimental material for this experiment. Two temperature levels were set, namely normal temperature control (30 ℃/22 ℃ for day (8:00-18:00)/ night (18:00- 8:00 the next day)) and high temperature treatment (38 ℃/28 ℃ for day/night). The two water conditions were normal water supply control (soil water content was 70%-80% of field capacity) and drought treatment (soil water content was set to 50%-60% of field capacity). There were four treatments in the experiment, including control (CK), high temperature stress (H), drought stress (D), high temperature and drought combined stress (HD), and the treatment began at VT stage (VT). The changes in leaf gas exchange parameters, photosystem Ⅱ (PSII) performance, key photosynthetic enzyme activity, plant biomass, and grain yield under different stress treatments were analyzed. 【Result】High temperature, drought and combined stress all led to the increase of chlorophyll fluorescence parameters, the ratio of a variable fluorescence F_K to F₀-F_J amplitude (W_K) and variable fluorescence F_J to F₀-F_J amplitude (V_J), and damaged the donor side and acceptor side of PSII. Compared with the control, PSII maximum quantum yield for primary photochemistry (φ_P0), the probability of captured excitons transferring electrons to other electron acceptors in the electron transfer chain beyond Q_A (Ψ₀), quantum yield for electron transport (φ_E0), quantum yield of energy dissipation (φ_D0), quantum yield for reduction of the end electron acceptors at the PSI acceptor side (φ_R0), and performance index based on absorption of light energy (PI_ABS) were significantly decreased, and the absorption and transfer of light energy were inhibited; absorbed photon flux per active PSII (ABS/RC), trapped energy flux per active PSII (TR₀/RC) and dissipated energy flux per active PSII (DI₀/RC) increased significantly, but the electron flux from Q_A^‒ to the PQ pool per active PSII (ET₀/RC) decreased significantly, which affected the energy distribution of reaction centers, reduced the number of PSII active reaction centers, and inhibited the performance of PSII. Combined stress could aggravate the inhibition of PSII performance by damaging the donor side, the acceptor side and the active reaction center. At the same time, the activities of ribose 1, 5-diphosphate carboxylase (Rubisco) and phosphoenolpyruvate carboxylase (PEPCase) decreased, which inhibited photosynthetic carbon assimilation. High temperature, drought, and combined stress reduced the net photosynthetic rate by reducing the performance of PSII and the activity of key photosynthetic enzymes. Compared with the control, the net photosynthetic rate of VT+5 d was reduced by 14.6%, 31.4%, and 39.9%, respectively. The decrease in photosynthetic rate inhibited the accumulation of biomass and its transport to grains. Under high temperature, drought, and combined stress, the grain yield decreased by 80.3%, 27.1%, and 84.0% than that under control, respectively. 【Conclusion】In summary, the combined stress of high temperature and drought mainly reduced net photosynthetic rate, hindered biomass, and reduced grain yield by inhibiting leaf PSII performance. The impact of combined stress on PSII performance and grain yield was greater than that of single stress under high temperature and drought.

Key words: high temperature and drought combined stress, net photosynthetic rate, PSII, photosynthetic enzyme, grain yield, summer maize

GUO Ya, REN Hao, WANG HongZhang, ZHANG JiWang, ZHAO Bin, REN BaiZhao, LIU Peng. High Temperature and Drought Combined Stress Inhibited Photosystem Ⅱ Performance and Decreased Grain Yield of Summer Maize[J].Scientia Agricultura Sinica, 2024, 57(21): 4205-4220.

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High Temperature and Drought Combined Stress Inhibited Photosystem Ⅱ Performance and Decreased Grain Yield of Summer Maize

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