Genetic divergence among infraspecific taxa of Sarracenia purpurea
Genetic divergence among infraspecific taxa of Sarracenia purpurea
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DOI：
10.2307/2419375
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发表时间：
1998-10-01
影响因子：
1
通讯作者：
Hamrick, JL
中科院分区：
文献类型：
--
作者：
Godt, MJW;Hamrick, JL
对紫瓶内八个种群的同种酶多样性和遗传分化进行了估计。对每个种下分类单元的两个种群（即紫紫亚种和布基亚种、蒙大拿州和维诺萨亚种）进行了分析。此外，在异地收集的变种中估计了遗传多样性。蒙大拿州出于恢复目的进行繁殖。使用 14 个酶系统解析了 23 个等位酶基因座。在种下类群中发现了显着的遗传差异。这些类群之间的平均遗传同一性为 0.80 (SD = 0.07)，而类群内种群之间的平均遗传同一性为 0.97 (SD = 0.04)。每个亚种内的种群。 venosa 品种聚集在 UPGMA 表型图上，亚种也是如此。紫癜人群。对于异型杂交、昆虫授粉的物种，种群间发现的总遗传变异的百分比平均高于报告的百分比（G(st) = 0.55），表明种群间存在显着的遗传差异，其中大多数（90%）可归因于种下类群之间的差异。 S. purpurea 复合体内的总体遗传多样性中等（P-s = 60.9%，AP(s) = 2.89 和 H-es = 0.189）。然而，与异交动物授粉的多年生植物相比，群体内平均遗传多样性较低（P-p = 23.4%，AP(p) = 2.14，H-ep = 0.055）。这些遗传结果，加上这个广泛分布的物种中描述的形态差异，表明种下类群在遗传上是不同的实体。指定类群之间高度的等位酶差异表明，可能需要对复合体进行分类学修订，并且应对品种的保护状况进行评估。最后，由于异地收集的变种的遗传多样性相对较低。蒙大拿州，该收集应补充其他变种的繁殖体。修复地点附近的蒙大拿州人口。
Allozyme diversity and genetic divergence were estimated for eight populations within Sarracenia purpurea. Two populations of each infraspecific taxon (i.e., subsp. purpurea, and subsp. venosa vars. burkii, montana and venosa) were analyzed. In addition, genetic diversity was estimated in an ex situ collection of var. montana propagated for restoration purposes. Twenty-three allozyme loci were resolved using 14 enzyme systems. Striking genetic differences were found among infraspecific taxa; mean genetic identity among these taxa was 0.80 (SD = 0.07), whereas mean genetic identity between populations within taxa was 0.97 (SD = 0.04). Populations within each subsp. venosa variety clustered on a UPGMA phenogram, as did subsp. purpura populations. The percentage of total genetic variation found among populations was higher than reported, on average, for outcrossing, insect-pollinated species (G(st) = 0.55), indicating significant genetic divergence among populations, most (90%) of which was attributable to differences among infraspecific taxa. Overall genetic diversity was moderate within the S. purpurea complex (P-s = 60.9%, AP(s) = 2.89 and H-es = 0.189). Compared with outcrossing animal-pollinated perennials, however, mean within-population genetic diversity was low (P-p = 23.4%, AP(p) = 2.14, and H-ep = 0.055). These genetic results, coupled with morphological differences described within this widespread species, indicate that the infraspecific taxa are genetically distinct entities. The high level of allozyme divergence among the named taxa suggests that taxonomic revision of the complex may be warranted and that the conservation status of the varieties should be evaluated. Finally, because genetic diversity was comparatively low within the ex situ collection of var. montana, the collection should be supplemented with propagules from other var. montana populations in the vicinity of the restoration site.