森林与环境学报2025，Vol.45Issue(2)：192-202,11.DOI:10.13324/j.cnki.jfcf.202410022
不同品种香榧对高温的生理响应及其耐热性评价
Physiological responses and heat resistance of Torreya grandis varieties to high temperatures
摘要
Abstract
This study aims to investigate the physiological responses of different varieties of Torreya grandis to high temperatures and identify heat-resistant varieties suitable for introduction to Chongqing.Three T.grandis varieties were selected as the research subjects.Key physiological indicators,including photosynthetic parameters,relative water content(RWC),relative electrical conductivity(REC),malondialdehyde(MDA)content,osmotic adjustment substances content,and antioxidant enzyme activities,were measured in the leaves of three varieties introduced to Chongqing.Heat resistance was evaluated by the subordinate function method.The results revealed significant variations in photosynthetic performance among the three T.grandis varieties exposed to high temperatures.'Dongfei 2 hao'exhibited higher maximum net photosynthetic rate(Pn,max),light compensation point(LCP),light saturation point(LSP),maximum carboxylation rate(Vc,max),maximum photosynthetic electron transport rate(Jmax),triose phosphate utilization rate(Rtpu),photosynthetic pigment content,and leaf nitrogen content,demonstrating higher photosynthetic efficiency and carbon assimilation capacity during summer.In contrast,'Dongfei 1 hao'displayed the lowest photosynthetic performance,with limited adaptability to heat stress.Distinct physiological responses to heat stress were also observed.'Dongfei 2 hao'maintained the highest RWC,proline content,and catalase activity,alongside the lowest REC and MDA levels.'Xiangyafei'exhibited the highest soluble sugar content,superoxide dismutase activity,and peroxidase activity,while'Dongfei 1 hao'showed the highest soluble protein content.The comprehensive evaluation ranked the heat resistance of the varieties as follows:'Dongfei 2 hao'>'Xiangyafei'>'Dongfei 1 hao'.Among the three varieties,'Dongfei 2 hao'demonstrated superior adaptability to high temperatures in Chongqing,with enhanced photosynthetic performance,robust osmotic adjustment,and strong antioxidant defense mechanisms.These findings underscore the potential for cultivation and promotion of'Dongfei 2 hao'in high-temperature regions.关键词
香榧/高温/生理特性/耐热性Key words
Torreya grandis/high temperature/physiological characteristics/heat resistance分类
林学引用本文复制引用
张钰林,刘亚敏,刘玉民,贾朋聚,朱娅婷..不同品种香榧对高温的生理响应及其耐热性评价[J].森林与环境学报,2025,45(2):192-202,11.基金项目
重庆市林业科技攻关重点项目"香榧引种试验及优良品种筛选与繁育技术研究"(ylky2015-07) （ylky2015-07）
重庆市科技兴林项目"香榧优良种苗快繁及高产复合栽培利用技术研究"(ylky2019-12). （ylky2019-12）
