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首页> 外文学位 >The phylogeography of North American Chestnuts and Chinquapins (Castanea, Mill., Fagaceae).
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The phylogeography of North American Chestnuts and Chinquapins (Castanea, Mill., Fagaceae).

机译：北美栗子和栗树的植物志（Castanea，Mill。，Fagaceae）。

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摘要

North American Castanea Mill. (Fagaceae) consists of three morphologically variable species: Castanea dentata, Castanea pumila and Castanea ozarkensis. Taxonomy of these species has been complicated by intermediate morphology, similarity in growth habit, and putative naturally occurring hybridization where species' ranges overlap in the southeast. The main goals of the present study were to: (1) determine if genetics reflect the morphological variation observed in southeastern populations of North American Castanea, (2) explore the extent of cpDNA haplotype sharing among these taxa, and (3) map haplotype distribution in relation to morphotaxa. Finally, I wanted to use the information obtained from these analyses to gain insight into southeastern populations, where intermediate morphologies and putative hybridization are confounding taxonomy. I sequenced the trnV-ndhC intergenic spacer region (∼380 bp) of the chloroplast for 233 Castanea accessions collected throughout the range of the genus, with a focus on southern Appalachian populations from Georgia, Tennessee and North Carolina. I identified four main chloroplast haplotypes and found that for three of these haplotypes, leaf morphology is a reliable indicator of haplotype identity. I found that the fourth haplotype is shared among accessions of C. dentata and C. pumila, and is also found in trees with intermediate morphology. The geographic mapping of these haplotypes revealed that each haplotype is found in a separate geographic range, allowing for the comparison of current distributions with locations of possible glacial refugia. Although the precise genetic basis of the confounding morphology in southeastern populations of North American Castanea is still uncertain, an intricate biogeographical history combined with the tendency of taxa within this genus to share haplotypes in sympatric areas could explain much of the morphological complexity of Castanea.
机译：北美板栗厂。 （Fagaceae）由3种形态上可变的物种组成：齿锥栗，栗锥栗和ozarkensis锥栗。这些物种的分类学由于中间形态，生长习性的相似性以及假定的自然发生的杂交而变得复杂，该物种的范围在东南部重叠。本研究的主要目标是：（1）确定遗传学是否反映了在北美栗树东南种群中观察到的形态变异，（2）探索这些类群之间cpDNA单倍型共享的程度，以及（3）映射单倍型分布关于吗啉。最后，我想利用从这些分析中获得的信息来深入了解东南种群，在这些种群中，中间形态和推定的杂交使分类学感到困惑。我对叶绿体的trnV-ndhC基因间隔区（约380 bp）进行了测序，确定了该属整个范围内收集的233种Castanea种质，重点是佐治亚州，田纳西州和北卡罗来纳州的阿巴拉契亚南部种群。我确定了四种主要的叶绿体单倍型，发现对于这三种单倍型，叶片形态是单倍型身份的可靠指标。我发现第四单倍型在齿状假单胞菌和普米假单胞菌的种质之间共享，并且在具有中间形态的树木中也发现。这些单倍型的地理图谱显示，每个单倍型都位于单独的地理范围内，从而可以将当前的分布与可能的冰川避难所的位置进行比较。尽管仍不确定北美板栗东南种群混杂形态的确切遗传基础，但复杂的生物地理历史加上该属中类群在同胞区共享单倍型的趋势，可以解释板栗的许多形态复杂性。

著录项

  • 作者

    Binkley, Meagan A.;

  • 作者单位

    The University of Tennessee at Chattanooga.;

  • 授予单位 The University of Tennessee at Chattanooga.;
  • 学科 Botany.;Molecular biology.
  • 学位 M.S.E.S.
  • 年度 2008
  • 页码 75 p.
  • 总页数 75
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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