摘要
稻族Oryzeae是禾本科Poaceae中包含多种经济植物的重要类群,现有大约12个属,广布全球的热带和温带地区。由于其重要的经济价值和在理论研究上的代表性,稻属Oryza及其近缘属的研究受到了广泛关注。虽然形态学和初步的分子证据表明稻族是一个单系类群,但稻族内各属的分类处理和属间系统发育关系以及稻族的起源、地理分布式样和机制等方面仍存在许多悬而未决的问题。本文简要回顾了稻族系统学研究的历史,包括稻族的建立及其在禾本科中的系统位置、稻族的族下划分、稻族各属的界定及其系统发育关系。目前已有的研究结果表明:稻族是单系类群,可分为两个主要分支,相当于传统的两个亚族(Zizaniinae和Oryzinae),但稻族单性花小穗是多次起源的,不宜作为划分亚族的依据;一些单型属(Hydrochloa、Porteresia和Prosphytochloa)的建立得不到分子证据的支持;根据分子钟原理估计稻族两个主要分支(亚族)的分歧时间在大约2000万年前,而稻属和近缘属假稻属Leersia的分歧时间为1400万年;稻属内主要类群的分歧时间在900万年前左右。此外,本文还对稻族的生物地理学问题进行了初步探讨,对稻族系统发育和进化研究中存在的问题及未来研究方向进行了讨论。
Oryzeae （Poaceae） is a tribe belonging to Poaceae and consists of about 12 genera. This tribe contains many economically important species, and is distributed in tropical and temperate regions worldwide. Recently, investigation on the genus Oryza and its related genera in the Oryzeae has attracted much attention for their important economic value and taxonomic position in the study of plant biology in general. Although morphological and preliminary molecular evidence has shown that the tribe Oryzeae is a monophyletic group, there are still many questions as to its systematics and evolution to be answered. In this review, we briefly retrospect the history and progress of the studies on the classification and phylogeny of Oryzeae, including its establishment and systematic position, its circumscription and subdivision, the relationships of genera in the tribe, and the distribution and origin of the tribe. Recent results indicate that （1） Oryzeae is monophyletic and falls into two main clades corresponding to the traditionally recognized subtribes （Zizaniinae and Oryzinae）; （2） Close affinities of the monoecious genera are not supported, suggesting the multiple origins of unisexual florets; （3） Previous recognition of three monotypic genera （Hydrochloa, Porteresia and Prosphytochloa） is not justified; （4） Based on dating using molecular clock approach, it is estimated that Oryza and Leersia branched off from the remaining genera of Oryzeae -20 million years ago （MYA）, and separated from each other -14 MYA. A divergence time of -9 MYA is also obtained for the most basal split within Oryza. In conjunction with our recent molecular studies, we present some progresses on the molecular phylogeny of Oryzeae and discuss the questions to be solved in the future study of this tribe.
出处
《植物分类学报》
CSCD
北大核心
2006年第2期211-230,共20页
Acta Phytotaxonomica Sinica
基金
科技部国际科技合作重点项目计划(2001CB711103)
国家自然科学基金(30025005
30121003)
中国科学院"十.五"重要方向项目(KSCXZ-SW-101A)~~
