Recruitment of IC-WOX Genes in Root Evolution

First author: Wu Liu; Affiliations: Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences (中国科学院上海植物生理生态研究所): Shanghai, China

Corresponding author: Lin Xu (徐麟)

Root evolution has resulted in the extant bifurcating roots (分叉根) in lycophytes (石松类植物), adventitious/lateral roots (不定根或侧根) in euphyllophytes 真叶类植物 (ferns and seed plants), and primary roots (主根) 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 (建成细胞). In the seed plant Arabidopsisthaliana, 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 (器官发生) and evolved into two subclades in seed plants: one was retained in adventitious root organogenesis, while the other was recruited for primary root organogenesis.

根的演化导致了现代石松类植物的分叉根、真叶类植物即蕨类和种子植物中的不定根和侧根以及种子植物中的主根。本文作者提出了WOX基因家族中间分枝IC-WOX基因在根演化中的作用。IC-WOX基因可能在石松类植物分叉根中并不特异表达。在蕨类植物Ceratopteris richardii中，IC-WOX在不定根或侧根的建成细胞中表达。在种子植物拟南芥中，存在两个IC-WOX的亚群，一个是AtWOX11/12，另一个是AtWOX8/9，分别在不定根和主根的建成细胞中表达。因此，IC-WOX基因在蕨类植物和种子植物共同祖先中开始参与不定根或侧根的器官发生，并且在种子植物中演化成两个亚分枝，一个继续在不定根的器官发生中发挥作用，另一个在主根的器官发生中发挥作用。

通讯：徐麟

研究方向：中国科学院上海植物生理生态研究所植物干细胞与再生的课题组长

doi: https://doi.org/10.1016/j.tplants.2018.03.011

Journal: Trends in Plant Science

Published online: 23 May, 2018

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