The Arabidopsis Root Tip (Phospho)Proteomes at Growth-Promoting versus Growth-Repressing Conditions Reveal Novel Root Growth Regulators

Natalia Nikonorova, Evan Murphy, Cassio Flavio Fonseca de Lima, Shanshuo Zhu, Brigitte van de Cotte, Lam Dai Vu, Daria Balcerowicz, Lanxin Li, Xiangpei Kong, Gieljan De Rop, Tom Beeckman, Jiří Friml, Kris Vissenberg, Peter C. Morris, Zhaojun Ding, Ive De Smet

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Abstract

Auxin plays a dual role in growth regulation and, depending on the tissue and concentration of the hormone, it can either promote or inhibit division and expansion processes in plants. Recent studies have revealed that, beyond transcriptional reprogramming, alternative auxin-controlled mechanisms regulate root growth. Here, we explored the impact of different concentrations of the synthetic auxin NAA that establish growth-promoting and -repressing conditions on the root tip proteome and phosphoproteome, generating a unique resource. From the phosphoproteome data, we pinpointed (novel) growth regulators, such as the RALF34-THE1 module. Our results, together with previously published studies, suggest that auxin, H+-ATPases, cell wall modifications and cell wall sensing receptor-like kinases are tightly embedded in a pathway regulating cell elongation. Furthermore, our study assigned a novel role to MKK2 as a regulator of primary root growth and a (potential) regulator of auxin biosynthesis and signalling, and suggests the importance of the MKK2 Thr31 phosphorylation site for growth regulation in the Arabidopsis root tip.

Original languageEnglish
Article number1665
JournalCells
Volume10
Issue number7
DOIs
Publication statusPublished - 2 Jul 2021

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