Molecular Systematics of the Zygnematales

Zygnematales 的分子系统学

• 批准号: 9020117
• 负责人: Richard McCourt
• 金额: $ 17.8万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9020117&HistoricalAwards=false
• 关键词: Molecular; Systematics; Zygnematales

Zygnematales is the most diverse member of the green algae with about 7,000 species in 55 genera. Current hypotheses of phylogenetic relationships among the green plants places this order as the sister taxon of the higher plants. However, phylogenetic relationships among the members of Zygnematales are problematic. This results in part because the individuals are subject to considerable morphological modification contingent upon the environment in which they occur and upon the chromosome number which is highly plastic. The PIs propose to examine genes that are not subject to such fluctuations in order to develop a phylogenetic model for this order of algae. The derived model should have implications for the origin and radiation of the land plants and the factors that may have played a role in the occupation of terrestrial habitats. The genes to be considered are all located in the chloroplast. This suite of genes has proven useful in elucidating the phylogenies of a variety of land plant groups. Therefore, the data set produced by the PIs can be directly applied to comparisons of all other green plants.

接合藻目是绿色藻类中最具多样性的成员， 55属7,000余种。 目前的假设 绿色植物之间的系统发育关系是这样排列的 作为高等植物的姐妹分类群。 然而， 接合藻目成员之间的关系存在问题。 这部分是因为个人受到 相当大的形态变化取决于 它们发生的环境和染色体数目 这是高度可塑的。 PI建议检查基因， 不受这样的波动，以发展一个系统发育 这是一个藻类的模型。 衍生模型应具有 对陆地植物的起源和辐射的影响， 可能在占领中发挥作用的因素 陆地栖息地 要考虑的基因都位于 在叶绿体中。 这套基因已被证明是有用的， 阐明了各种陆生植物类群的共生性。 因此，PI产生的数据集可以直接应用于 与其他所有绿色植物的比较。