Comparative tree-ring anatomy of Fraxinus excelsior with Chalara dieback

作     者：Mirela Tulik Barbaros Yaman Nesibe Kose 

作者机构：Department of Forest BotanyWarsaw University of Life Sciences– SGGWWarsaw 02-787Poland Wood Anatomy and Dendrochronology LaboratoryBartin UniversityFaculty of ForestryBartinTurkey Department of Forest BotanyIstanbul UniversityFaculty of Forestry34473 IstanbulTurkey 

出 版 物：《Journal of Forestry Research》 (林业研究（英文版）)

年 卷 期：2018年第29卷第6期

页      面：1741-1749页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 0901[农学-作物学] 

基　　金：partly supported by Grant No.NN309 077438 from the Ministry of Science and Higher Education 

主　　题：Ash Dieback Fibres Vessels Wood 

摘      要：We tested the hypothesis that the biometrical characters of wood elements in ash trees(Fraxinus excelsior L.) become modified in response to the progression of disease caused by Chalara fraxinea. Anatomical analyses were performed on wood samples collected at breast height from the trunks of groups of ash trees which contained healthy, weakened and dead trees. We measured(1) treering width,(2) earlywood vessel diameter,(3) earlywood vessel element length,(4) fibre length,(5) fibre diameter,(6) fibre lumen diameter, and(7) fibre wall thickness. We showed that tree-ring width diminished in all analysed groups during disease progression. However, the greatest suppression of growth was observed in dead trees. In both weakened and dead ash trees, the reduction in tree-ring width was accompanied by diminished vessel diameter in the earlywood of the outermost annual rings. The annual rings of dead trees had shorter fibres having greater lumen diameter and thinner cell walls. Consequently, water conduction in the sapwood of dead ash trees was less efficient owing to reduced vessel diameter, and this seems to be one of the greatest disease-induced morphological modifications. All the anatomical modifications might be due to leaf loss and crown dieback triggered by Chalara fraxinea.