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Tree Age-Related Differences in Chilling Resistance and Bark-Bleeding Physiological Responses to Chemical Component and Fiber Morphology Changes in Cell Walls of Hevea brasiliensis Bark

文献类型： 外文期刊

作者： Cheng, Linlin 1 ; Jiang, Huichuan 1 ; Xie, Guishui 1 ; Wang, Jikun 1 ; Peng, Wentao 1 ; Zhou, Lijun 1 ; Liu, Wanting 1 ; Wu, Dingquan 1 ; An, Feng 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Peoples R China

2.Hainan Danzhou Agroecosyst Natl Observat & Res Stn, Danzhou 571737, Peoples R China

关键词： cold damage; LT50; relative water content; bark photosynthetic pigment; fiber dimension; bark tensile property; correlation analysis

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 16 期

页码：

收录情况： SCI

摘要： The purpose of this study was to establish the relationship between the chilling resistance of rubber trees and the bark-bleeding characteristics caused by chilling stress, considering physiological indicators in rubber tree bark, cell wall chemical components, fiber morphologies, and tensile properties. This offered a unique perspective for examining the underlying mechanisms of latex bleeding and chilling stress in Hevea brasiliensis. One-year-old seedlings and two-year-old twig segments in five- and twenty-one-year-old rubber trees (5YB and 21YB) were used to compare the age-mediation differences in their various parameters. Meanwhile, the LT50 values were calculated with Logistic regression analysis of relative electrical conductivity (REC) data under gradient low temperatures. Subsequently, changes in corresponding parameters of 1-year-old seedling stem bark at different ages were determined, and the bark-bleeding characteristics of seedlings and twig segments were analyzed under artificially simulated chilling stress, respectively. A correlation analysis between semi-lethal temperature (LT50) values, relative water content (RWC) values, bark-bleeding characteristics, cell-wall chemical component contents, fiber dimensions, and tensile property parameters was implemented to estimate interrelationships among them. The LT50 values ranged from -2.0387 degrees C to -0.8695 degrees C. The results showed that the chilling resistance order of rubber trees at different ages was as follows: 21YB (2-year-old twig bark from 21-year-old rubber trees) > 5YB (2-year-old twig bark from 5-year-old rubber trees) > SLB (semi-lignification bark in 1-year-old seedlings) > GB (green bark in 1-year-old seedlings). The chilling resistance of seedlings and twig segments in rubber trees was highly positively (p < 0.001) related to fiber morphologies. Chilling-induced bark-bleeding characteristics were significantly correlated (p < 0.001) with fiber morphologies, bark tensile properties, and cell-wall components. The analysis data in this study contribute towards building a comprehensive understanding of the mechanisms of chilling-induced bark bleeding needed not only in rubber tree cultivation but also in sustainable rubber production.

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