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Evolution of Life Cycle in Land Plants

机译:陆地植物生命周期的演变

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A complete life cycle of sexually reproducing eukaryotes consists of a diploid phase and a haploid phase.The relative length of either phase varies greatly among different lineages of eukaryotes.Under a recently reconstructed molecular phylogeny of streptophytes (charophyte algae and land plants),we examined the pattern of life cycle change in Characeae,liverworts,mosses,hornworts,lycophytes,monilophytes,and seed plants.We found that the life cycle of land plants had evolved in a direction of continuously expanding the diploid phase while reducing the haploid phase.In other words,evolution of land plants can be viewed as a series of events of delaying meiosis after fertilization and reducing mitosis after meiosis.Adaptive significance of this life cycle change will be discussed,and molecular mechanisms underlying this life change will also be explored.
机译:有性生殖真核生物的完整生命周期包括一个二倍体相和一个单倍体相。每个相的相对长度在真核生物的不同谱系之间差异很大。在最近重建的链状藻类(系统藻类和陆地植物)分子系统发育中,我们进行了研究木犀科,柳叶植物,苔藓,金缕梅,石生植物,单生植物和种子植物的生命周期变化模式。我们发现陆地植物的生命周期朝着不断扩大二倍体相而减少单倍体相的方向发展。换句话说,陆地植物的进化可以看作是一系列受精后减数分裂和减数分裂后减有丝分裂的事件。将讨论这种生命周期变化的适应性意义,并探讨这种生命变化的分子机制。

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