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Phylogeography and reproductive ecology of the woodland herbs, Trillium erectum and Trillium grandiflorum (Melanthiaceae).

机译:林地药草,延龄草和延龄草(Melanthiaceae)的植物学和生殖生态学。

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摘要

Field experiments and genetic markers were used to study the reproductive ecology and phylogeography of Trillium erectum and T. grandiflorum (Melanthiaceae), two spring woodland herbs in eastern North America. First, mating systems and determinants of fertility were investigated using controlled pollinations and allozyme assays. Both species possessed leaky self-incompatibility systems although T. erectum practiced more self-fertilization than T. grandiflorum . Pollen and resources limited seed fertility in T. grandiflorum . Second, phylogeographic approaches were used to investigate the history of both species following the Wisconsin glaciation. Based on variability in chloroplast DNA markers, a possible post-glacial migration route was proposed for T. grandiflorum. No variation in the chloroplast genome was detected in T. erectum. Analysis of allozyme variation indicated that gene flow is greater among populations of T. grandiflorum than of T. erectum. There was no loss of genetic diversity at allozyme loci in northern compared to southern populations of either species.
机译:通过田间试验和遗传标记研究了 Terium erectum T的生殖生态学和种系。 grandiflorum (Melanthiaceae),北美东部的两种春季林地草药。首先,使用控制的授粉和同工酶试验研究了交配系统和决定生育力的因素。尽管 T. erectum T实践更多的自体受精,但这两个物种都具有渗漏的自我不相容系统。大花。花粉和资源限制了<斜体> T中的种子繁殖力。大花。其次,威斯康星州冰川化之后,采用了地理学方法研究了这两个物种的历史。根据叶绿体DNA标记的变异性,提出了 T可能的冰川后迁移途径。大花。在<斜体> T中未检测到叶绿体基因组的变化。勃起。对同工酶变异的分析表明, T群体之间的基因流更大。 大于 T。勃起。与两种物种的南部种群相比,北部的同工酶基因座没有遗传多样性的损失。

著录项

  • 作者

    Griffin, Steven Richard.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Biology Ecology.; Biology Botany.
  • 学位 M.Sc.
  • 年度 2001
  • 页码 114 p.
  • 总页数 114
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学(生物生态学);植物学;
  • 关键词

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