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首页> 美国卫生研究院文献>Annals of Botany >Increased fire frequency promotes stronger spatial genetic structure and natural selection at regional and local scales in Pinus halepensis Mill
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Increased fire frequency promotes stronger spatial genetic structure and natural selection at regional and local scales in Pinus halepensis Mill

机译：火频率的增加促进了哈尔滨松的区域和地方尺度上更强的空间遗传结构和自然选择

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>Background and Aims The recurrence of wildfires is predicted to increase due to global climate change, resulting in severe impacts on biodiversity and ecosystem functioning. Recurrent fires can drive plant adaptation and reduce genetic diversity; however, the underlying population genetic processes have not been studied in detail. In this study, the neutral and adaptive evolutionary effects of contrasting fire regimes were examined in the keystone tree species Pinus halepensis Mill. (Aleppo pine), a fire-adapted conifer. The genetic diversity, demographic history and spatial genetic structure were assessed at local (within-population) and regional scales for populations exposed to different crown fire frequencies. >Methods Eight natural P. halepensis stands were sampled in the east of the Iberian Peninsula, five of them in a region exposed to frequent crown fires (HiFi) and three of them in an adjacent region with a low frequency of crown fires (LoFi). Samples were genotyped at nine neutral simple sequence repeats (SSRs) and at 251 single nucleotide polymorphisms (SNPs) from coding regions, some of them potentially important for fire adaptation. >Key Results Fire regime had no effects on genetic diversity or demographic history. Three high-differentiation outlier SNPs were identified between HiFi and LoFi stands, suggesting fire-related selection at the regional scale. At the local scale, fine-scale spatial genetic structure (SGS) was overall weak as expected for a wind-pollinated and wind-dispersed tree species. HiFi stands displayed a stronger SGS than LoFi stands at SNPs, which probably reflected the simultaneous post-fire recruitment of co-dispersed related seeds. SNPs with exceptionally strong SGS, a proxy for microenvironmental selection, were only reliably identified under the HiFi regime. >Conclusions An increasing fire frequency as predicted due to global change can promote increased SGS with stronger family structures and alter natural selection in P. halepensis and in plants with similar life history traits.
机译：>背景和目标：由于全球气候变化，预计野火的发生率会增加，这将严重影响生物多样性和生态系统的功能。反复发生的大火可促进植物适应并减少遗传多样性；但是，尚未对潜在的种群遗传过程进行详细研究。在这项研究中，研究了对比火势的中性和适应性进化效应，主要是在梯形树种Pinus halepensis Mill中进行的。 （阿勒颇松树），一种适应火的针叶树。在局部（种群内）和区域范围内评估了遭受不同冠火频率的人群的遗传多样性，人口历史和空间遗传结构。 >方法在伊比利亚半岛东部采样了8个天然哈氏疟原虫林，其中5个在频繁发生冠火（HiFi）的区域，另外3个在邻近的低频区域冠火（LoFi）。在来自编码区的9个中性简单序列重复（SSR）和251个单核苷酸多态性（SNP）处对样品进行基因分型，其中一些对火适应性可能很重要。 >主要结果：火灾对遗传多样性或人口历史没有影响。在HiFi和LoFi展台之间发现了三个高分化离群SNP，这表明在区域范围内与火灾相关的选择。在地方尺度上，细微的空间遗传结构（SGS）总体上是弱的，正如风传粉和风散树种所预期的那样。 HiFi展位比SNP的LoFi展位显示出更强的SGS，这很可能反映了共同分散的相关种子在火后同时招募。只有在HiFi体制下才能可靠地识别出具有非常强大的SGS（可作为微环境选择的替代物）的SNP。 >结论：由于全球变化而导致的着火频率增加，可以促进具有更强的家庭结构的SGS的增加，并改变halepensis和具有相似生活史特征的植物的自然选择。

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