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Cellular and Molecular Life Sciences

, Volume 75, Issue 18, pp 3329–3338 | Cite as

Pivotal role of LBD16 in root and root-like organ initiation

  • Wu Liu
  • Jie Yu
  • Yachao Ge
  • Peng Qin
  • Lin XuEmail author
Review

Abstract

In the post-embryonic stage of Arabidopsis thaliana, roots can be initiated from the vascular region of the existing roots or non-root organs; they are designated as lateral roots (LRs) and adventitious roots (ARs), respectively. Some root-like organs can also be initiated from the vasculature. In tissue culture, auxin-induced callus, which is a group of pluripotent root-primordium-like cells, is formed via the rooting pathway. The formation of feeding structures from the vasculature induced by root-knot nematodes also borrows the rooting pathway. In this review, we summarize and discuss recent progress on the role of LATERAL ORGAN BOUNDARIES DOMAIN16 (LBD16; also known as ASYMMETRIC LEAVES2-LIKE18, ASL18), a member of the LBD/ASL gene family encoding plant-specific transcription factors, in roots and root-like organ initiation. Different root and root-like organ initiation processes have distinct priming mechanisms to specify founder cells. All these priming mechanisms converge to activate LBD16 expression in the primed founder cells. The activation of LBD16 expression leads to organ initiation via promotion of cell division and establishment of root-primordium identity. Therefore, LBD16 might play a common and pivotal role in root and root-like organ initiation.

Keywords

Root founder cell Lateral root Adventitious root LBD16 Callus Root-knot nematodes 

Abbreviations

AR

Adventitious root

ARF

AUXIN RESPONSE FACTOR

ASL

ASYMMETRIC LEAVES2-LIKE

ATXR2

ARABIDOPSIS TRITHORAX-RELATED 2

Aux/IAA

AUXIN/INDOLE-3-ACETIC ACID

AuxRE

AUXIN RESPONSE ELEMENT

CIM

Callus-inducing medium

CRL1

CROWN ROTLESS1

eY1H

Enhanced yeast one-hybrid

FAD-BD

FAD-BINDING BERBERINE

LBD

LATERAL ORGAN BOUNDARIES DOMAIN

LR

Lateral root

PLT

PLETHORA

RIM

Root-inducing medium

RTCS

ROOTLESS CONCERNING CROWN AND SEMINAL ROOTS

SIM

Shoot-inducing medium

SLR

SOLITARY-ROOT

WOX

WUSCHEL-RELATED HOMEOBOX

Notes

Acknowledgements

We apologize for references not cited due to space limitations. This work was supported by grants from the National Natural Science Foundation of China (31630007), National Basic Research Program of China (973 Program, 2014CB943500), the Key Research Program of CAS (QYZDB-SSW-SMC010), the Strategic Priority Research Program “Molecular Mechanism of Plant Growth and Development” of CAS (XDPB0403), and National Key Laboratory of Plant Molecular Genetics.

Compliance with ethical standards

Conflict of interest

No conflicts of interest declared.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Department of Instrument Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina

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