Auxin-dependent control of a plasmodesmal regulator creates a negative feedback loop modulating lateral root emergence

Ross Sager, Xu Wang, Kristine Hill, Byung-Chun Yoo, Jeffery Caplan, Alex Nedo, Thu Tran, Malcolm J. Bennett and Jung-Youn Lee ()
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Ross Sager: University of Delaware
Xu Wang: University of Delaware
Kristine Hill: University of Nottingham
Byung-Chun Yoo: Christina Health Care System
Jeffery Caplan: University of Delaware
Alex Nedo: University of Delaware
Thu Tran: University of Delaware
Malcolm J. Bennett: University of Nottingham
Jung-Youn Lee: University of Delaware

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Lateral roots originate from initial cells deep within the main root and must emerge through several overlying layers. Lateral root emergence requires the outgrowth of the new primordium (LRP) to coincide with the timely separation of overlying root cells, a developmental program coordinated by the hormone auxin. Here, we report that in Arabidopsis thaliana roots, auxin controls the spatiotemporal expression of the plasmodesmal regulator PDLP5 in cells overlying LRP, creating a negative feedback loop. PDLP5, which functions to restrict the cell-to-cell movement of signals via plasmodesmata, is induced by auxin in cells overlying LRP in a progressive manner. PDLP5 localizes to plasmodesmata in these cells and negatively impacts organ emergence as well as overall root branching. We present a model, incorporating the spatiotemporal expression of PDLP5 in LRP-overlying cells into known auxin-regulated LRP-overlying cell separation pathways, and speculate how PDLP5 may function to negatively regulate the lateral root emergence process.

Date: 2020
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DOI: 10.1038/s41467-019-14226-7

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