Phylogenetic Analysis of the Grass Tribe Poeae (Poaceae, Subfamily Pooideae)

在开花植物科中，禾本科(Poaceae)是世界植被中最显著的成分之一，也是经济上最重要的。草科在分类上被划分为六个形态上不同的亚科，其中包括Pooideae，它包括了世界寒温带地区的大多数草。禾本科约650个属之间的系统发育或进化关系尚不清楚，其中包括约150个Pooideae亚科的属，部分原因是草的营养和生殖部分的简化和简化。康奈尔大学的杰罗尔德·戴维斯博士正在研究Pooideae亚科部分成员的系统发育关系，特别关注Poeae部落(包括羊茅、早熟禾和小麦)和Aveneae部落(包括燕麦)。正在收集形态和分子数据，后者来自对具有代表性的牧草样本叶绿体DNA中核苷酸突变的深入分析。正在对形态和分子多样性模式进行比较，并使用一致模式来澄清草科植物的进化趋势，并确定迁徙和地理分布的途径。

Among families of flowering plants, the grass family (Poaceae) is one of the most conspicuous elements of world vegetation, and economically the most important. The grass family is classified taxonomically into six morphologically distinct subfamilies, among them the Pooideae, which includes the majority of grasses of the world's cool temperate regions. Phylogenetic or evolutionary relationships remain obscure among the 650 or so genera of the Poaceae, including the 150 or so of subfamily Pooideae, in part because of the reduced and streamlined nature of grass vegetative and reproductive parts. Dr. Jerrold Davis of Cornell University is studying the phylogenetic relationships of selected members of the Pooideae with specific attention to two of its major subgroupings, the tribe Poeae (including fescues, bluegrasses, and wheats) and the tribe Aveneae (including oats). Both morphological and molecular data are being collected, the latter from intensive analyses of nucleotide mutations in the chloroplast DNA of representative grass samples. Comparisons between morphological and molecular patterns of diversification are being made, and congruent patterns are being used to clarify evolutionary trends within the grass family and determine pathways of migration and geographical distribution.