Department of Biology, Fukuoka University of Education, 729-1 Akama, Munakata, 811-41 Japan; and.
Am J Bot. 1999 Feb;86(2):287-92.
Populations of each of the four species of Tricyrtis sect. Flavae were sampled using enzyme electrophoresis to examine the effect of geographic range and dichogamy on the genetic diversity of the species. The most widespread species, T. nana, had the lowest level of genetic diversity at both the population and the species level. The depauperate genetic diversity at the population level of T. nana appears to result from the high self-fertilization of the species. The low genetic diversity at the species level of T. nana probably resulted from the bottleneck effect during the speciation process in which this species diverged from the progenitor species, T. flava. Genetic differentiation among populations was high in both adichogamous T. nana and protandrous T. flava. High self-fertilization in T. nana and the colonizing nature of T. flava are likely the main factors causing the differentiated population genetic structure. In contrast to a previous study on chloroplast DNA (cpDNA) variation in Tricyrtis sect. Flavae, T. nana was most closely related to T. flava, which corresponds to the morphological resemblance of both species.
采用酶电泳法对黄兜兰组的四个种的种群进行了抽样调查，以检验地理范围和雌雄异熟性对物种遗传多样性的影响。分布最广的物种，即小香蒲，在种群和物种水平上的遗传多样性水平最低。小香蒲种群水平上遗传多样性的匮乏似乎是由于该物种自交率高所致。小香蒲物种水平上的低遗传多样性可能是由于该物种从祖种黄花杓兰分化过程中的瓶颈效应所致。雌雄异熟的小香蒲和先熟的黄花杓兰种群间的遗传分化均较高。小香蒲的自交率高和黄花杓兰的定居特性可能是导致种群遗传结构分化的主要因素。与之前对黄兜兰组叶绿体 DNA (cpDNA)变异的研究相比，小香蒲与黄花杓兰的亲缘关系最近，这与两个物种的形态相似性相对应。
