西北林学院学报2024，Vol.39Issue(4)：96-103,8.DOI:10.3969/j.issn.1001-7461.2024.04.12
5个蔷薇科树种栓塞疲劳及其与导管解剖结构的关系
Cavitation Fatigue in Five Rosaceae Species and Its Relationships with Vessel Anatomy
摘要
Abstract
Cavitation fatigue is a phenomenon in which a plant has already experienced cavitation once,and after embolism refilling,its embolism resistance is reduced when it is exposed to drought stress again.Embolism fatigue can weaken water transport in xylem of plants and threaten plant's growth and survival during drought.As one of the representative species in the northern temperate zone,Rosaceae tree species are often subjected to drought stress.In the study,to determine whether cavitation fatigue occurs in common Rosaceae tree species and to reveal the xylem anatomical mechanism causing interspecific differ-ences in cavitation fatigue,Pyrus bretschneideri,Malus pumila,Prunus persica,P.salicina,P.pseudo-cerasus were used as research materials,assessing the occurrence and degree of cavitation fatigue by Cavitron centrifuge technique and analyzing the correlation between the degree of cavitation fatigue and the anatomical traits of xylem vessels(vessel diameter,vessel density,intervessel contact fraction,conduit wall span,double vessel wall thickness,theoretical vessel implosion resistance).All species suffered from cavita-tion fatigue and were"weakened species".The degree of cavitation fatigue(DCF)of all species was above 70％,with the largest DCF for P.persica(88.01±0.85)％and the least DCF 7 for M.pumila(74.21±2.16)％.DCF was negatively correlated with vessel density(P＜0.05)and positively correlated with in-ter-catheter wall thickness(P＜0.01),suggesting that the species with less vessel density and thick double vessel wall exhibits a high degree of cavitation fatigue.Considering that the important role of intervessel pit structure in cavitation resistance of tree species,future studies should perform a comprehensive analysis combining xylem vessel and pit level to improve our knowledge of the impact of frequent drought events on tree embolism resistance under climate change.关键词
栓塞脆弱性/栓塞疲劳/木质部导管结构/蔷薇科Key words
xylem vulnerability to embolism/cavitation fatigue/xylem vessel anatomy/Rosaceae分类
农业科技引用本文复制引用
廖苏慧,马博龙,吕倾子,张钧堯,蔡靖..5个蔷薇科树种栓塞疲劳及其与导管解剖结构的关系[J].西北林学院学报,2024,39(4):96-103,8.基金项目
国家自然科学基金项目(32271578,31570588). （32271578,31570588）
