Population Divergence and Evolution of the Hawaiian Endemic Sesbania tomentosa (Fabaceae)

IF 0.7 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY
Pacific Science Pub Date : 2021-11-12 DOI:10.2984/75.4.1
David M. Cole, C. Morden
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引用次数: 4

Abstract

Abstract: Sesbania tomentosa (Fabaceae) is an endemic flowering plant primarily adapted to coastal strand and dry lowland habitat in the Hawaiian Islands. Previous studies have attempted to delineate distinct taxa from among the extant populations. In the most recent treatment of Hawaiian Fabaceae, however, S. tomentosa was recognized as a single polymorphic species with two forms. To readdress issues of taxonomy, the present study utilized microsatellite marker variation and DNA sequencing to discriminate Hawaiian Sesbania populations. While there was no DNA sequence variation among species for ITS or TRPT gene regions, microsatellite analysis found a highly differentiated population structure at the nine loci sampled. Bayesian genetic clustering assignments and associated private alleles occurred in a distinct phylogeographic pattern. As a result, three distinct genetic groups were identified corresponding to islands of origin: populations from Nihoa, Kaua‘i, and O‘ahu (group 1), populations from Maui, Kaho‘olawe, and Moloka‘i (group 2), and populations from Hawai‘i Island (group 3). The extremely varied yet randomly overlapping morphologies among the populations suggest widespread convergent evolution has occurred and precludes any subspecific taxonomic designations. We interpret the high levels of genetic marker and morphologic differentiation exhibited by Hawaiian Sesbania to be a product of the plant’s reproductive ecology and its influence in sub-structuring populations on a small geographic scale. Efforts toward preservation of the wide range of distinctive appearing morphotypes should continue, facilitated by the natural tendency of the plant to maintain a more or less fixed state of certain traits within populations.
夏威夷田葵(豆科)的种群分化与进化
摘要:毛Sesbania tomptosa(蚕豆科)是一种特有的开花植物,主要适应夏威夷群岛的海岸线和干燥的低地栖息地。先前的研究试图从现存种群中划分出不同的分类群。然而,在夏威夷Fabaceae的最新处理中,毛白杨被认为是一个具有两种形式的单一多态性物种。为了重新认识分类学问题,本研究利用微卫星标记变异和DNA测序来区分夏威夷Sesbania种群。虽然ITS或TRPT基因区域在物种之间没有DNA序列变异,但微卫星分析发现,在采样的9个基因座上存在高度分化的群体结构。贝叶斯遗传聚类分配和相关的私人等位基因以不同的系统地理学模式出现。因此,确定了三个不同的遗传群,分别对应于起源岛屿:尼霍亚、考艾岛和奥胡岛的种群(第1组),毛伊岛、卡霍奥拉韦岛和莫洛卡岛的种群,以及夏威夷岛的种群。种群之间极其多样但随机重叠的形态表明,已经发生了广泛的趋同进化,并排除了任何亚种分类命名。我们将夏威夷Sesbania表现出的高水平遗传标记和形态分化解释为该植物繁殖生态及其在小地理范围内对亚结构种群的影响的产物。由于植物在种群中保持某些性状或多或少固定的自然趋势,应继续努力保护各种不同的形态类型。
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来源期刊
Pacific Science
Pacific Science 生物-动物学
CiteScore
1.40
自引率
14.30%
发文量
17
审稿时长
3 months
期刊介绍: Pacific Science: A Quarterly Devoted to the Biological and Physical Sciences of the Pacific Region The official journal of the Pacific Science Association. Appearing quarterly since 1947, Pacific Science is an international, multidisciplinary journal reporting research on the biological and physical sciences of the Pacific basin. It focuses on biogeography, ecology, evolution, geology and volcanology, oceanography, paleontology, and systematics. In addition to publishing original research, the journal features review articles providing a synthesis of current knowledge.
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