Evolution of class III homeodomain-leucine zipper genes in streptophytes
Evolution of class III homeodomain-leucine zipper genes in streptophytes
复制标题
DOI：
10.1534/genetics.105.054239
复制
发表时间：
2006-05-01
期刊：
影响因子：
3.3
通讯作者：
Bowman, John L.
中科院分区：
文献类型：
--
作者：
Floyd, Sandra K.;Zalewski, Christopher S.;Bowman, John L.
陆地植物经历了巨大的进化变化，在祖先谱系从藻类近亲分化之后。随着胚芽分支的多样化，出现了一些重要的发育创新，导致了新的器官和组织类型的出现。为了了解这些变化是如何发生的，我们需要确定负责生长、图案化和分化的基本遗传发育程序，并描述这些程序是如何随着时间的推移被修改和细化以产生新的形态的。在模式植物拟南芥中发现的III类同源结构域亮氨酸拉链(III类HD-Zip)基因为基本陆地植物模式基因提供了良好的候选基因。我们表明这些基因可能是在陆地植物及其藻类姐妹群的共同祖先中进化而来的，并且随着陆地植物谱系的多样化，基因家族也发生了多样化。系统发育分析，非开花世系的表达数据，以及拟南芥和其他开花植物的证据表明，III类HD-Zip基因在孢子体顶端生长、维管形成和分化以及叶片发育中获得了新的功能。随着III类HD-Zip基因的多样化，表达模式的改变可能在陆地植物形态的进化中发挥了重要作用。
Land plants underwent tremendous evolutionary change following the divergence of the ancestral lineage from algal relatives. Several important developmental innovations appeared as the embryophyte clade diversified, leading to the appearance of new organs and tissue types. To understand how these changes came about, we need to identify the fundamental genetic developmental programs that are responsible for growth, patterning, and differentiation and describe how these programs were modified and elaborated through time to produce novel morphologies. Class III homeodomain-leucine zipper (class III HD-Zip) genes, identified in the model plant Arabidopsis thaliana, provide good candidates for basic land plant patterning genes. We show that these genes may have evolved in a common ancestor of land plants and their algal sister group and that the gene family has diversified as land plant lineages have diversified. Phylogenetic analysis, expression data from nonflowering lineages, and evidence from Arabidopsis and other flowering plants indicate that class III HD-Zip genes acquired new functions in sporophyte apical growth, vascular patterning and differentiation, and leaf development. Modification of expression patterns that accompanied diversification of class III HD-Zip genes likely played an important role in the evolution of land plant form.