Changes in Photosynthetic Characteristics of <i>Paeonia suffruticosa</i> under High Temperature Stress
Wen Ji,
Haiyan Luo,
Yuqin Song,
Erman Hong,
Zhijun Li,
Bangyu Lin,
Chenwei Fan,
Huasen Wang,
Xinzhang Song,
Songheng Jin,
Xia Chen,
Xiangtao Zhu
Affiliations
Wen Ji
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
Haiyan Luo
Collaborative Innovation Center for Efficient and Green Production of Agriculture in Mountainous Areas of Zhejiang Province, College of Horticulture Science, Zhejiang A&F University, Hangzhou 311300, China
Yuqin Song
Collaborative Innovation Center for Efficient and Green Production of Agriculture in Mountainous Areas of Zhejiang Province, College of Horticulture Science, Zhejiang A&F University, Hangzhou 311300, China
Erman Hong
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
Zhijun Li
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
Bangyu Lin
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
Chenwei Fan
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
Huasen Wang
Collaborative Innovation Center for Efficient and Green Production of Agriculture in Mountainous Areas of Zhejiang Province, College of Horticulture Science, Zhejiang A&F University, Hangzhou 311300, China
Xinzhang Song
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
Songheng Jin
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
Xia Chen
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
Xiangtao Zhu
College of Jiyang, Zhejiang A&F University, Zhuji 311800, China
This study explored the changes in the photosynthetic characteristics of the Fengdan peony under high-temperature stress to provide a reference for understanding the tolerance of peony plants under heat stress. In this study, the effects of high-temperature stress (40 °C) on the photosynthetic characteristics of the Fengdan leaves were studied. At 25 °C, the net photosynthetic rate (Pn), stomatal conductance (Gs), and transpiration rate (Tr) of the leaves decreased gradually with the increase in heat stress time, and intercellular CO2 concentration (Ci) decreased first and then increased. High-temperature stress reduced the light energy absorption (ABS/RC) and capture (TRO/RC), light energy for electron transport (ETO/RC), and heat dissipation (DIO/RC) per unit leaf area. The maximum photochemical efficiency (FV/FM), leaf photochemical performance index (PIabs), the probability that captured excitons can transfer electrons to other electron acceptors in the electron transport chain beyond QA (ψO), and the quantum yield for electron transport (φEo), decreased gradually. The results showed that high temperatures damaged the photosynthetic capacity of the peony leaves and destroyed the photosynthetic apparatus of leaves. This study provides a reference for understanding the photosynthetic characteristics and tolerance of peony plants under heat stress.
