Are there hybrid zones in Fagus sylvatica L. sensu lato?

IF 2.6 2区 农林科学 Q1 FORESTRY European Journal of Forest Research Pub Date : 2023-12-05 DOI:10.1007/s10342-023-01634-0
Matúš Hrivnák, Diana Krajmerová, Ladislav Paule, Petar Zhelev, Hakan Sevik, Mladen Ivanković, Nana Goginashvili, Juraj Paule, Dušan Gömöry
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Abstract

The complex of beech taxa in western Eurasia (Fagus sylvatica L. s.l.) represents one of the most widespread broad-leaved trees in the temperate forests of the northern hemisphere. Two subspecies are generally recognized, F. sylvatica ssp. sylvatica in Europe and F. sylvatica ssp. orientalis in southwestern Asia, but several strongly differentiated regional populations were identified within this complex. To reveal geographical and genomic patterns of hybridization and introgression, genetic variation at 6789 single-nucleotide polymorphisms (SNP) resulting from ddRAD sequencing was studied in 288 specimens representing 207 populations distributed across the whole range. Two clusters resulting from a Bayesian analysis of population Structure well coincided with the subspecies, while increasing the number of clusters allowed to distinguish divergent lineages within subspecies. Two zones of potential hybridization between such lineages were analyzed: western Balkans at the contact of both subspecies and the Alpine area at the contact of populations coming from different glacial refugia. Geographical distribution of hybrid indices in the Balkan hybrid zone indicates asymmetric gene flow preferentially directed from F. orientalis to F. sylvatica. Eight SNPs showed a significant shift of genomic cline centers, seven of them toward excess F. orientalis ancestry, suggesting that introgression irregularly affects different regions of the beech genome. On the other hand, no genomic cline outliers were found in the Alpine hybrid zone. Implications for assisted gene flow are shortly discussed.

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山毛榉是否存在杂交带?
欧亚大陆西部的山毛榉类群(Fagus sylvatica l.s.l .)是北半球温带森林中分布最广的阔叶树群之一。两个亚种通常被承认,F. sylvatica ssp。欧洲的森林木和森林木。但在这个复合体中发现了几个分化强烈的区域种群。为了揭示杂交和渗入的地理和基因组模式,研究了分布在整个范围内的207个种群的288个标本中ddRAD测序产生的6789个单核苷酸多态性(SNP)的遗传变异。种群结构贝叶斯分析产生的两个聚类与亚种很好地吻合,而增加的聚类数量允许在亚种内区分不同的谱系。分析了这两个谱系之间的两个潜在杂交区:两个亚种接触的巴尔干西部地区和来自不同冰川避难所的种群接触的阿尔卑斯地区。巴尔干杂交带杂交指数的地理分布表明,基因流动不对称,优先从东方木向森林木转移。8个SNPs显示了基因组突变中心的显著转移,其中7个指向东方山毛榉的多余祖先,表明基因渗入对山毛榉基因组不同区域的影响是不规则的。另一方面,在高山杂交带没有发现基因组突变异常值。对辅助基因流动的影响将很快进行讨论。
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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
77
审稿时长
6-16 weeks
期刊介绍: The European Journal of Forest Research focuses on publishing innovative results of empirical or model-oriented studies which contribute to the development of broad principles underlying forest ecosystems, their functions and services. Papers which exclusively report methods, models, techniques or case studies are beyond the scope of the journal, while papers on studies at the molecular or cellular level will be considered where they address the relevance of their results to the understanding of ecosystem structure and function. Papers relating to forest operations and forest engineering will be considered if they are tailored within a forest ecosystem context.
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