Functional analysis of the auxin-inducible LBD/ASL family in the lateral root formation

在拟南芥中，侧根(LR)的形成是由亲本根的木质部极中柱细胞(XPP)的不对称分裂(ACD)启动的。我们发现生长素诱导的LBD16/ASL18在第一次ACD之前在少数XPP细胞中特异表达，并在LR形成中与其他相关的LBD/ASL蛋白冗余地发挥功能。此外，生长素诱导的LBD/ASL蛋白的局部活性与LR启动所必需的LR创始细胞中不对称性的建立有关。

In Arabidopsis thaliana, lateral root (LR) formation is initiated from asymmetric cell divisions (ACDs) of the xylem pole pericycle cells (XPPs) of the parent roots. We show that auxin-inducible LBD16/ASL18 was specifically expressed in a small number of XPP cells before the first ACD and functions redundantly with the other related LBD/ASL proteins in LR formation. Furthermore, the localized activity of auxin-inducible LBD/ASL proteins links to the establishment of asymmetry in the LR founder cells necessary for LR initiation.