植物分类学报    2008 46 (3): 287-306    ISSN: 0529-1526  CN: 11-1897/Q  首页     当期目录 上一期    下一期

 
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轮藻和陆地植物系统发育及其进化

仇寅龙
(Department of Ecology & Evolutionary Biology, The University Herbarium, University of Michigan, Ann Arbor, MI 48109-1048, USA)
收稿日期 2008-3-20   修回日期 2008-5-6   网络版发布日期  2008-5-9   接受日期 
摘要  Charophytic algae and land plants together make up a monophyletic group, streptophytes, which represents one of the main lineages of multicellular eukaryotes and has contributed greatly to change of the environment on earth in the Phanerozoic Eon. Significant progress has been made to understand phylogenetic relationships among members of this group by phylogenetic studies of morphological and molecular data over the last twenty-five years. Mesostigma viride is now regarded as among the earliest diverging unicellular organisms in streptophytes. Characeae are the sister group to land plants. Liverworts represent the first diverging lineage of land plants. Hornworts and lycophytes are extant representatives of bryophytes and vascular plants, respectively, when early land plants changed from gametophyte to sporophyte as the dominant generation in the life cycle. Equisetum, Psilotaceae, and ferns constitute the monophyletic group of monilophytes, which are sister to seed plants. Gnetales are related to conifers, not to angiosperms as previously thought. Amborella, Nymphaeales, Hydatellaceae, Illiciales, Trimeniaceae, and Austrobaileya represent the earliest diverging lineages of extant angiosperms. These phylogenetic results, together with recent progress on elucidating genetic and developmental aspects of the plant life cycle, multicellularity, and gravitropism, will facilitate evolutionary developmental studies of these key traits, which will help us to gain mechanistic understanding on how plants adapted to environmental challenges when they colonized the land during one of the major transitions in evolution of life.

关键词
   charophytes   evolution   gravitropism   land plants   life cycle   multicellularity   origin   phragmoplast   phylogeny   plasmodesmata   the tree of life  
分类号
DOI:  10.3724/SP.J.1002.2008.08035
 

通讯作者:
仇寅龙 ylqiu@umich.edu
作者个人主页: 仇寅龙