Evaluation of heat resistance of 13 tree peony varieties based on semi-lethal high temperature

doi:10.14088/j.cnki.issn0439-8114.2024.06.018

Abstract

Abstract: In order to evaluate the heat resistance of tree peony（Paeonia suffruticosa Andr.） germplasm resources, 13 representative tree peony cultivars were selected as experimental materials, and the semi-lethal high temperature （LT₅₀） was studied by the conductivity method and Logistic equation. The results showed that with the treating temperatures higher step-by-step, the cell damage rate of 13 tree peony cultivars showed a typical S curve increasing trend, and the significance test conformed to the Logistic equation. The LT₅₀ of 13 tree peony cultivars ranged from 51.31 ℃ to 59.73 ℃, among which B24 had the highest LT₅₀ of 59.73 ℃, while Haihuang had the lowest LT₅₀ of 51.31 ℃. Based on sequential clustering method, 13 tree peony cultivars could be divided into 3 groups： B24, Taipinghong, B10, Fengdanhe and Fengdanbai belonged to the heat resistant type, with an average LT₅₀ of 57.70 ℃; Xiangyu, Lianhe, Wuxingyu, Daojin and Dianjianghong belonged to the moderate heat resistant type, with an average LT₅₀ of 56.32 ℃; ZB1, Pomozi and Haihuang belonged to the heat sensitive type, with an average LT₅₀ of 53.32 ℃.

Key words: tree peony（Paeonia suffruticosa Andr.）, cell damage rate, Logistic equation, semi-lethal high temperature, heat resistance

CLC Number:

S685.11

YU Xin, CHEN Fa-zhi, LIU Zhong, CHEN Zhi-wei, JI Xiao-mei, LI Xiu-li. Evaluation of heat resistance of 13 tree peony varieties based on semi-lethal high temperature[J]. HUBEI AGRICULTURAL SCIENCES, 2024, 63(6): 116-120.

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