Photosynthetic and physiological responses of different peony cultivars to high temperature

作者：Wen Ji, Erman Hong, Xia Chen, Zhijun Li, Bangyu Lin, Xuanze Xia, Tianyao Li, Xinzhang Song, Songheng Jin, Xiangtao Zhu · 发表于：Frontiers in Plant Science · 年份：2022 · DOI：10.3389/fpls.2022.969718 · 被引用次数：17 · 研究领域：Photosynthetic Processes and Mechanisms、Plant responses to elevated CO2、Plant Water Relations and Carbon Dynamics

In order to investigate the causes of the differences in heat tolerance (‘Lu He Hong’ and ‘Zhi Hong’), we studied the physiological changes, photosynthetic properties and regulatory mechanism of the two peony cultivars at high temperature. The results showed that the physiological changed of different peony cultivars varied significantly under high temperature stress. With the extension of high temperature stress time, MDA content of 'Lu He Hong' increased,while 'Zhi Hong' rised first and then decreased, SOD activity of 'Lu He Hong' rised first and then decreased, that of 'Zhi Hong' kept rising, POD activity of 'Lu He Hong' kept decreasing, while 'Zhi Hong' rised. The photosynthetic instrument records the change of peony photosynthesis parameters at high temperature; the chlorophyll A (Chla) fluorescence transient is recorded using the plant efficiency analyzer (PEA), analyzed according to the JIP test (O-J-I-P fluorescence transient analysis), and several parameters were derived to explain the photosynthetic efficiency difference between different peony cultivars. The tested cultivars responded differently to the survey conditions, and the PCA analysis showed that the ‘Zhi Hong’ was more well tolerated and showed better thermal stability of the PSII. The reduced efficiency of the ‘Lu He Hong’ PSII antenna leads to higher heat dissipation values to increase the light energy absorbed by unit reaction center (ABS/RC), the energy captured by unit reaction center (TR 0 /RC), and ...