生物
植物进化
背景(考古学)
进化生物学
古生代
苔藓植物
分子钟
单系
奥陶纪
系统基因组学
系统发育树
维管植物
生态学
古生物学
克莱德
基因组
基因
物种丰富度
生物化学
作者
Philip C. J. Donoghue,C. Jill Harrison,Jordi Paps,Harald Schneider
出处
期刊:Current Biology
[Elsevier]
日期:2021-10-01
卷期号:31 (19): R1281-R1298
被引量:71
标识
DOI:10.1016/j.cub.2021.07.038
摘要
There can be no doubt that early land plant evolution transformed the planet but, until recently, how and when this was achieved was unclear. Coincidence in the first appearance of land plant fossils and formative shifts in atmospheric oxygen and CO2 are an artefact of the paucity of earlier terrestrial rocks. Disentangling the timing of land plant bodyplan assembly and its impact on global biogeochemical cycles has been precluded by uncertainty concerning the relationships of bryophytes to one another and to the tracheophytes, as well as the timescale over which these events unfolded. New genome and transcriptome sequencing projects, combined with the application of sophisticated phylogenomic modelling methods, have yielded increasing support for the Setaphyta clade of liverworts and mosses, within monophyletic bryophytes. We consider the evolution of anatomy, genes, genomes and of development within this phylogenetic context, concluding that many vascular plant (tracheophytes) novelties were already present in a comparatively complex last common ancestor of living land plants (embryophytes). Molecular clock analyses indicate that embryophytes emerged in a mid-Cambrian to early Ordovician interval, compatible with hypotheses on their role as geoengineers, precipitating early Palaeozoic glaciations.
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