Crops ›› 2025, Vol. 41 ›› Issue (3): 102-107.doi: 10.16035/j.issn.1001-7283.2025.03.014

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Effects of Heat Acclimation on Physiological and Biochemical Characteristics of Erigeron breviscapus under High Temperature Stress

Xu Honggao1(), Xu Ping1(), Luo Wenxiu1, Lu You1, Tu Zhenhua1, Zhang Xuan1, Chen Yichun1, Zheng Guowei1(), Yang Yingcui2, Chen Jia3()   

  1. 1College of Traditional Chinese Medicine, Yunnan University of Traditional Chinese Medicine, Kunming 650500, Yunnan, China
    2Nujiang Runfeng Agricultural Science and Technology Service Co., Ltd., Nujiang 673500, Yunnan, China
    3College of Ethnic Medicines, Yunnan University of Traditional Chinese Medicine, Kunming 650500, Yunnan, China
  • Received:2024-03-30 Revised:2024-07-03 Online:2025-06-15 Published:2025-06-03

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Abstract:

To study whether the heat acclimated Erigeron breviscapus has improved its ability to resist high temperature stress and its corresponding physiological response, E.breviscapus was used as the test material. The experimental group (T) consisted of E.breviscapus that had been heat-treated at (36.0±0.5) ℃ for one day, while the control group (CK) was comprised of plants grown under normal conditions at 22℃. Physiological and biochemical indexes were compared before and after four hours of stress at (48.0± 0.5) ℃, as well as after three hours of recovery at (36.0±0.5) ℃. The injury index after four hours of stress was also evaluated. The results showed that the relative conductivity and malondialdehyde content of T treated E. breviscapus decreased and the relative water content increased after three hours recovery at (36.0±0.5) °C after high temperature stress, while the recovery of CK group had no significant change compared with that of high temperature stress, and lost the recovery ability. At the same time, the contents of photosynthetic pigment (chlorophyll) and osmoregulatory substances such as proline, soluble sugar and soluble protein in T group were higher than those in CK group during high temperature stress. The above results indicated that heat acclimation treatment could alleviate the damage of high temperature on E.breviscapus and improve its resistance to high temperature stress.

Key words: Erigeron breviscapus (Vant.) H.-Mazz, Heat acclimation, High temperature stress, Physiological and biochemical characteristics

Table 1

Statistics of damage caused by high temperature stress in E.breviscapus"

处理
Treatment		 热害指数级别株数
Number of plants of thermal
damage index grade		 总株数
Total
number
of plants		 热害指数
Thermal
damage
index
0 1 2 3 4 5
CK 0 0 2 4 5 16 27 0.8592
T 8 8 4 2 2 3 27 0.3333

Fig.1

Phenotype of E.breviscapus in each treatment stage (a) before heat stress; (b) after heat stress; (c) after recovery."

Fig.2

Changes in RWC and REC of E.breviscapus leaves after high temperature stress Different lowercase letters indicate significant differences (P < 0.05), the same below."

Fig.3

Changes in chlorophyll and carotene contents of E.breviscapus after high temperature stress"

Fig.4

Changes of osmotic adjustment substances in E.breviscapus after high temperature stress"

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