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

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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.

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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

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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.

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  1. Wu Liu and Jie Yu have contributed equally to this work.

Authors and Affiliations

  1. 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, Shanghai, China

    Wu Liu, Jie Yu, Yachao Ge & Lin Xu

  2. University of Chinese Academy of Sciences, Beijing, China

    Yachao Ge

  3. Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai, China

    Peng Qin

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  1. Wu Liu
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Correspondence to Lin Xu.

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Liu, W., Yu, J., Ge, Y. et al. Pivotal role of LBD16 in root and root-like organ initiation. Cell. Mol. Life Sci. 75, 3329–3338 (2018). https://doi.org/10.1007/s00018-018-2861-5

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