Morphological and genetic differentiation in isolated populations of Mexican beech Fagus grandifolia subsp.mexicana  

作　　者：Dulce María Galván-Hernández Pablo Octavio-Aguilar Luis Lazcano-Cruz Arturo Sánchez-González 

机构地区：[1]Population Ecology Laboratory of the Biological Research Center,Autonomous University of Hidalgo,Km 4.5 Pachuca-Tulancingo Highway,CP 42184 Mineral de La Reforma,Hidalgo,Mexico [2]Genetic Laboratory of the Biological Research Center,Autonomous University of Hidalgo,Km 4.5 Pachuca-Tulancingo Highway,CP 42184 Mineral de La Reforma,Hidalgo,Mexico

出　　处：《Journal of Forestry Research》2021年第5期2169-2179,共11页林业研究（英文版）

基　　金：the National Council of Science and Technology;Basic Science Project“Effect of climate change on relict tree populations:integrating dendrochronology and population genetics”,CB-2016/284,484;by the Project INFR-252807 for the genetic analysis;National Council of Science and Technology,postdoctoral grant 316,763。

摘　　要：Mexican beech[Fagus grandifolia subsp.mexicana(Martinez)A.E.Murray]is a subspecies endemic to the Sierra Madre Oriental Mountains and considered endangered due to the low density of its populations and high degree of habitat fragmentation and environmental specificity.Because its morphological and genetic variation is associated with its ability to adapt to changes in environmental conditions,the objective of this study was to determine whether phenotypic and genotypic variation exist,and it relationships with population reduction events.In four beech populations in the states of Hidalgo and Veracruz,we analyzed 11 morphological variables for leaves and 6 micros atellite markers.The morphological variables that to discriminate between populations were related to the size of the leaf,but a robust differentiation pattern was not found,given that independent groups of leaves were identified.The populations located closest to each other,had greater genetic variation and less genetic distance;populations in the extreme north and south had the lowest genetic variation.Genetic differentiation among populations was associated with reduction in population size.In the 3 localities in Hidalgo,recent bottlenecks were identified,and in Veracruz,an old bottleneck was found.Variation in leaf morphology and genetic structure of Mexican beech populations could be the result of a combination of various geographical,climate and ecological factors.

关 键 词：Adaptation BOTTLENECK Genetic structure Leaf morphology Mexico Sierra madre oriental 

分 类 号：S792.99[农业科学—林木遗传育种]