Rarity does not limit genetic variation or preclude subpopulation structure in the geographically restricted desert forb Astragalus lentiginosus var. piscinensis
Rarity does not limit genetic variation or preclude subpopulation structure in the geographically restricted desert forb Astragalus lentiginosus var. piscinensis
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稀有性并不限制遗传变异或排除地理限制的沙漠黄芪黄芪亚种群结构。
DOI：
10.1002/ajb2.1235
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发表时间：
2019
影响因子：
3
通讯作者：
Parchman, Thomas L.
中科院分区：
文献类型：
--
作者：
Harrison, Joshua G.;Forister, Matthew L.;Mcknight, Stephanie R.;Nordin, Erin;Parchman, Thomas L.
稀有类群的特征包括小种群规模和有限的地理范围。对于大多数分类群来说，稀有性的遗传后果知之甚少。一个小的地理范围可能会导致减少隔离的距离或环境的机会，从而限制遗传结构和变异，但很少有研究探讨遗传结构在小的空间尺度有足够的分辨率来测试这一假设。此外，很少有比较遗传学研究存在于不同的罕见程度的infrataxa。在这里，我们比较遗传变异的品种ofAstragalus lentiginosus不同的范围大小。此外，我们还想知道A中是否存在遗传结构。piscinensis是一种稀有的类群，由数千个个体组成，坚持在约8 km2的碱性土壤上。使用测序基因分型（GBS）方法，产生了11，475个单核苷酸多态性（SNP）。我们描述了A. piscinensis使用第二GBS数据集的7274 SNPs和探索遗传结构和环境variation.Key ResultsWe发现之间没有关联的遗传变异和范围大小之间的品种A。雀斑样痣此外，尽管A. lentiginosusvar.piscinensis，我们报告了一个明确的遗传结构与土壤composition.ConclusionsOur结果表明，细尺度的遗传结构可能存在于其他rareAstragalustaxa和稀有性并不排除在这个属的遗传多样性的维护与微生境变化的亚群之间。
Premise of the StudyCharacteristics of rare taxa include small population sizes and limited geographical ranges. The genetic consequences of rarity are poorly understood for most taxa. A small geographical range could result in reduced opportunity for isolation by distance or environment, thereby limiting genetic structure and variation, but few studies explore genetic structure at small spatial scales with sufficient resolution to test this hypothesis. Moreover, few comparative genetic studies exist among infrataxa differing in rarity. Here, we compare genetic variation among varieties ofAstragalus lentiginosusdiffering in range size. Additionally, we ask if genetic structure exists inA. lentiginosusvar.piscinensis, a rare taxon consisting of several thousand individuals that persist on ~8 km2of alkaline soil.MethodsWe compared genetic variation among 11 varieties ofA. lentiginosusdiffering in range size using a genotyping by sequencing (GBS) approach, which generated 11,475 single nucleotide polymorphisms (SNPs). We characterized genetic structure among subpopulations ofA. lentiginosusvar.piscinensisusing a second GBS data set of 7274 SNPs and explored associations between genetic structure and environmental variation.Key ResultsWe found no association between genetic variation and range size among varieties ofA. lentiginosus. Additionally, despite the extremely small range ofA. lentiginosusvar.piscinensis, we report a well‐defined genetic structure among subpopulations associated with microhabitat variation in soil composition.ConclusionsOur results suggest that fine scale genetic structure may exist within other rareAstragalustaxa and that rarity does not preclude the maintenance of genetic diversity in this genus.
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影响因子：
48
作者：
Langmead, Ben;Salzberg, Steven L.
通讯作者：
Salzberg, Steven L.
Aliso：系统和植物区系植物学杂志 Aliso：系统和植物区系植物学杂志 黄芪稀有性：加州视角 黄芪稀有性：加州视角
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
M. Garrettson;H. Weiss;E. McDonald;L. Degutis
通讯作者：
L. Degutis
影响因子：
3.3
作者：
R. Hudson;M. Slatkint;W. Maddison
通讯作者：
R. Hudson;M. Slatkint;W. Maddison
影响因子：
0.9
作者：
B. Knaus;R. Cronn;A. Liston
通讯作者：
A. Liston
影响因子：
1.3
作者：
D. Gesch;Michael J. Oimoen;Susan Greenlee;C. A. Nelson;M. J. Steuck;Dean J. Tyler
通讯作者：
D. Gesch;Michael J. Oimoen;Susan Greenlee;C. A. Nelson;M. J. Steuck;Dean J. Tyler