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首页> 外文期刊>Botanical Journal of the Linnean Society >Morphotypes, varieties, or subspecies?: genetic diversity and differentiation of four Saintpaulia (Gesneriaceae) morphotypes from the East Usambara Mountains, Tanzania
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Morphotypes, varieties, or subspecies?: genetic diversity and differentiation of four Saintpaulia (Gesneriaceae) morphotypes from the East Usambara Mountains, Tanzania

机译:形态类型,变种或亚种?:坦桑尼亚东部乌桑巴拉山的四种非洲堇(Gesneriaceae)形态型的遗传多样性和分化

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摘要

Saintpaulia (H. Wendl.) is a forest-dependent, endangered plant genus endemic to Tanzania and Kenya. The taxonomy of Saintpaulia from the Usambara Mountains and adjacent lowlands in north-eastern Tanzania is problematic because of the morphological similarity of the species and the presence of considerable intraspecific variation. Conventional molecular phylogenetic methods have failed to reveal the genetic structure of this Saintpaulia complex. In this study, we assessed the genetic composition of 12 Saintpaulia populations, representing four different morphotypes, from the East Usambara Mountains using inter-simple sequence repeat (ISSR) markers. Relatively high genetic diversities were observed within populations (mean h = 0.320), indicating their adaptive potential. Little genetic differentiation amongst populations (mean F st = 0.063) and the genetic divergence of the rosulate and trailing morphotypes support the hypothesis of ongoing divergent evolution within the East Usambara metapopulation(s) of Saintpaulia.
机译:非洲菊(H. Wendl。)是坦桑尼亚和肯尼亚特有的森林依赖型濒危植物。由于该物种形态上的相似性以及种内种内变异的存在,因此来自乌桑巴拉山和坦桑尼亚东北部相邻低地的非洲堇的分类法存在问题。传统的分子系统发育方法未能揭示该非洲菊复合体的遗传结构。在这项研究中,我们使用简单序列重复(ISSR)标记评估了东乌桑巴拉山脉中代表四种不同形态型的12个非洲堇种群的遗传组成。在种群中观察到相对较高的遗传多样性(平均h = 0.320),表明它们的适应潜力。种群之间很少的遗传分化(平均F st = 0.063)以及玫瑰型和尾随形态型的遗传差异支持了非洲东部乌桑巴拉种群中正在进行的差异进化的假说。

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