Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

AT-HOOK MOTIF NUCLEAR LOCALISED PROTEIN 18 as a Novel Modulator of Root System Architecture

Version 1 : Received: 3 March 2020 / Approved: 4 March 2020 / Online: 4 March 2020 (04:40:34 CET)

A peer-reviewed article of this Preprint also exists.

Širl, M.; Šnajdrová, T.; Gutiérrez-Alanís, D.; Dubrovsky, J.G.; Vielle-Calzada, J.P.; Kulich, I.; Soukup, A. At-Hook Motif Nuclear Localised Protein 18 as a Novel Modulator of Root System Architecture. Int. J. Mol. Sci. 2020, 21, 1886. Širl, M.; Šnajdrová, T.; Gutiérrez-Alanís, D.; Dubrovsky, J.G.; Vielle-Calzada, J.P.; Kulich, I.; Soukup, A. At-Hook Motif Nuclear Localised Protein 18 as a Novel Modulator of Root System Architecture. Int. J. Mol. Sci. 2020, 21, 1886.

Journal reference: Int. J. Mol. Sci. 2020, 21, 1886
DOI: 10.3390/ijms21051886

Abstract

The AT-HOOK MOTIF NUCLEAR LOCALIZED PROTEIN (AHL) gene family encodes embryophyte-specific nuclear proteins with DNA binding activity. They modulate gene expression and affect various developmental processes in plants. We identify AHL18 (At3G60870) as a developmental modulator of root system architecture and growth. AHL18 regulates the length of the proliferation domain and number of dividing cells in the root apical meristem and thereby, cell production. Both primary root growth and lateral root development respond according to AHL18 transcription level. The ahl18 knock-out plants show reduced root systems due to a shorter primary root and a lower number of lateral roots. This change results from a higher number of arrested and non-developing lateral root primordia (LRP) rather than from decreased initiation. Overexpression of AHL18 results in a more extensive root system, longer primary roots, and increased density of lateral root initiation events. Formation of lateral roots is affected during the initiation of LRP and later development. AHL18 regulate root apical meristem activity, lateral root initiation and emergence, which is in accord with localization of its expression.

Subject Areas

AT-hook motif nuclear protein 18; AHL18; At3G60870; Arabidopsis; Lateral root development; Root apical meristem; Cell proliferation

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