Sequential induction of auxin efflux and influx carriers regulates lateral root emergence

Péret, Benjamin; Middleton, A.; French, A. P.; Larrieu, Antoine; Bishopp, Anthony; Njo, Maria; Wells, Darren M.; Porco, Silvana; Mellor, Nathan; Band, Leah R.; Casimiro, Ilda; Kleine‐Vehn, Jürgen; Vanneste, Steffen; Sairanen, Ilkka; Mallet, Romain; Sandberg, Göran; Ljung, Karin; Beeckman, Tom; Benková, Eva; Friml, Jiřı́; Kramer, Eric M.; King, John R.; Smet, Ive De; Pridmore, Tony; Owen, Markus R.; Bennett, Malcolm J.

doi:10.1038/msb.2013.43

Cited by 107 publications

(117 citation statements)

References 35 publications

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“…Lateral roots form after embryogenesis and are primed in the differentiation zone of the meristem (De Smet et al, 2007;De Rybel et al, 2010). Subsequently, they emerge through the outer layers of the main root (Lavenus et al, 2013) upon modification of these layers (Péret et al, 2013;Vermeer et al, 2014). In total darkness, the Arabidopsis seedling elongates its hypocotyl in an attempt to penetrate the soil, but its root stays very small (Fig.…”

Section: Root Development In Dark Versus Lightmentioning

confidence: 99%

Light Signaling, Root Development, and Plasticity

2017

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Section: Root Development In Dark Versus Lightmentioning

confidence: 99%

Light Signaling, Root Development, and Plasticity

2017

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“…1E and 3). This process is promoted by shootderived auxin (Bhalerao et al, 2002;Swarup et al, 2008) channeled by newly initiated primordia via the sequential induction of PIN3 and LIKE AUX1 3 (LAX3) auxin efflux and influx carrier genes in overlying cortical cells (Swarup et al, 2008;Péret et al, 2013). This dynamic pattern of auxin carrier expression functions to first mobilize, and then accumulate, auxin in a subset of cells directly overlying new lateral root primordia.…”

Section: Lateral Root Emergencementioning

confidence: 99%

Branching Out in Roots: Uncovering Form, Function, and Regulation

et al. 2014

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Root branching is critical for plants to secure anchorage and ensure the supply of water, minerals, and nutrients. To date, research on root branching has focused on lateral root development in young seedlings. However, many other programs of postembryonic root organogenesis exist in angiosperms. In cereal crops, the majority of the mature root system is composed of several classes of adventitious roots that include crown roots and brace roots. In this Update, we initially describe the diversity of postembryonic root forms. Next, we review recent advances in our understanding of the genes, signals, and mechanisms regulating lateral root and adventitious root branching in the plant models Arabidopsis (Arabidopsis thaliana), maize (Zea mays), and rice (Oryza sativa). While many common signals, regulatory components, and mechanisms have been identified that control the initiation, morphogenesis, and emergence of new lateral and adventitious root organs, much more remains to be done. We conclude by discussing the challenges and opportunities facing root branching research.

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“…These studies have shown that, in addition to the PIN proteins controlling auxin efflux, a group of auxin importers (AUX/LAX) is also required to recreate the pattern of auxin seen at the root tip. In general, these models have all focused on the longitudinal flow of auxin; while there have been some models considering the radial flow of auxin in outer tissues (Swarup et al, 2005;Laskowski et al, 2008;Péret et al, 2013), these have not studied radial auxin flow through the vascular tissues. Other studies have considered radial pattering of the shoot using models formulated with a one-dimensional ring of cells (Ibañes et al, 2009;Fàbregas et al, 2015).…”

Section: Previous Models Of Hormone Action In the Root Tipmentioning

confidence: 99%

Theoretical approaches to understanding root vascular patterning: a consensus between recent models

Mellor

Adibi

El‐Showk

et al. 2016

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractThe root vascular tissues provide an excellent system for studying organ patterning, as the specification of these tissues signals a transition from radial symmetry to bisymmetric patterns. The patterning process is controlled by the combined action of hormonal signaling/transport pathways, transcription factors, and miRNA that operate through a series of non-linear pathways to drive pattern formation collectively. With the discovery of multiple components and feedback loops controlling patterning, it has become increasingly difficult to understand how these interactions act in unison to determine pattern formation in multicellular tissues. Three independent mathematical models of root vascular patterning have been formulated in the last few years, providing an excellent example of how theoretical approaches can complement experimental studies to provide new insights into complex systems. In many aspects these models support each other; however, each study also provides its own novel findings and unique viewpoints. Here we reconcile these models by identifying the commonalities and exploring the differences between them by testing how transferable findings are between models. New simulations herein support the hypothesis that an asymmetry in auxin input can direct the formation of vascular pattern. We show that the xylem axis can act as a sole source of cytokinin and specify the correct pattern, but also that broader patterns of cytokinin production are also able to pattern the root. By comparing the three modeling approaches, we gain further insight into vascular patterning and identify several key areas for experimental investigation.

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Sequential induction of auxin efflux and influx carriers regulates lateral root emergence

Abstract: Emergence of a new lateral root primordium through the outer layers of the parental root requires the sequential auxin-mediated induction of two auxin transporters. This positive feedback regulatory loop coordinates patterned gene expression in outer tissues.

Cited by 107 publications

References 35 publications

Light Signaling, Root Development, and Plasticity

Light Signaling, Root Development, and Plasticity

Branching Out in Roots: Uncovering Form, Function, and Regulation

Theoretical approaches to understanding root vascular patterning: a consensus between recent models

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