National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai 200032, China.
National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai 200032, China.
Trends Plant Sci. 2018 Jun;23(6):490-496. doi: 10.1016/j.tplants.2018.03.011.
Root evolution has resulted in the extant bifurcating roots in lycophytes, adventitious/lateral roots in euphyllophytes (ferns and seed plants), and primary roots in seed plants. Here, we hypothesize a role for intermediate-clade-WUSCHEL-RELATED HOMEOBOX (IC-WOX) genes in root evolution. IC-WOX might not be specifically involved in lycophyte bifurcation rooting. In the fern Ceratopteris richardii, IC-WOX is expressed in adventitious/lateral root founder cells. In the seed plant Arabidopsis thaliana, there are two IC-WOX subclades, AtWOX11/12 and AtWOX8/9, in adventitious and primary root founder cells, respectively. Thus, IC-WOX was recruited in the common ancestor of ferns and seed plants for adventitious/lateral root organogenesis and evolved into two subclades in seed plants: one was retained in adventitious root organogenesis, while the other was recruited for primary root organogenesis.
根的进化导致了现存的石松类植物的二叉分枝根、真叶植物（蕨类植物和种子植物）的不定根/侧根，以及种子植物的主根。在这里，我们假设中间谱系-WUSCHEL-RELATED HOMEOBOX（IC-WOX）基因在根的进化中起作用。IC-WOX 可能与石松类植物的二叉分枝根没有特别的关系。在蕨类植物蜈蚣草中，IC-WOX 在不定根/侧根起始细胞中表达。在种子植物拟南芥中，有两个 IC-WOX 亚家族，AtWOX11/12 和 AtWOX8/9，分别在不定根和主根起始细胞中表达。因此，IC-WOX 在蕨类植物和种子植物的共同祖先中被招募用于不定根/侧根器官发生，并在种子植物中进化成两个亚家族：一个保留在不定根器官发生中，而另一个则被招募用于主根器官发生。
