Lateral root formation and the multiple roles of auxin

Du, Yujuan and Scheres, Ben ORCID: https://orcid.org/0000-0001-5400-9578 2018. Lateral root formation and the multiple roles of auxin. Journal of Experimental Botany 69 (2) , pp. 155-167. 10.1093/jxb/erx223

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Abstract

Root systems can display variable architectures that contribute to survival strategies of plants. The model plant Arabidopsis thaliana possesses a tap root system, in which the primary root and lateral roots (LRs) are major architectural determinants. The phytohormone auxin fulfils multiple roles throughout LR development. In this review, we summarize recent advances in our understanding of four aspects of LR formation: (i) LR positioning, which determines the spatial distribution of lateral root primordia (LRP) and LRs along primary roots; (ii) LR initiation, encompassing the activation of nuclear migration in specified lateral root founder cells (LRFCs) up to the first asymmetric cell division; (iii) LR outgrowth, the ‘primordium-intrinsic’ patterning of de novo organ tissues and a meristem; and (iv) LR emergence, an interaction between LRP and overlaying tissues to allow passage through cell layers. We discuss how auxin signaling, embedded in a changing developmental context, plays important roles in all four phases. In addition, we discuss how rapid progress in gene network identification and analysis, modeling, and four-dimensional imaging techniques have led to an increasingly detailed understanding of the dynamic regulatory networks that control LR development.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences
Publisher:	Oxford University Press
ISSN:	0022-0957
Last Modified:	24 Oct 2022 08:22
URI:	https://orca.cardiff.ac.uk/id/eprint/117547

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