Natural genetic variation shapes root system responses to phytohormones in Arabidopsis

The Plant Journal : for Cell and Molecular Biology
Daniela RistovaWolfgang Busch

Abstract

Plants adjust their architecture by modulating organ growth. This ability is largely dependent on phytohormones. While responses to phytohormones have been studied extensively, it remains unclear to which extent and how these responses are modulated in non-reference strains. Here, we assess variation of root traits upon treatment with auxin, cytokinin and abscisic acid (ABA) in 192 Arabidopsis accessions. We identify common response patterns, uncover the extent of their modulation by specific genotypes, and find that the Col-0 reference accession is not a good representative of the species in this regard. We conduct genome-wide association studies and identify 114 significant associations, most of them relating to ABA treatment. The numerous ABA candidate genes are not enriched for known ABA-associated genes, indicating that we largely uncovered unknown players. Overall, our study provides a comprehensive view of the diversity of hormone responses in the Arabidopsis thaliana species, and shows that variation of genes that are yet mostly not associated with such a role to determine natural variation of the response to phytohormones.

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Citations

Nov 18, 2018·The Plant Journal : for Cell and Molecular Biology·Maricris L ZaidemMichael D Purugganan
Nov 18, 2019·Plant, Cell & Environment·Benedict C OyigaAgim Ballvora
Jan 21, 2020·Journal of Experimental Botany·Agnieszka Deja-MuylleTom Beeckman
May 28, 2020·Frontiers in Plant Science·J Calleja-CabreraM Pernas
Apr 2, 2019·Frontiers in Plant Science·María Salud JustamanteJosé Manuel Pérez-Pérez
Dec 15, 2020·Physiologia Plantarum·Jitendra KumarKadambot H M Siddique

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Methods Mentioned

BETA
RSA
chip
PCA

Software Mentioned

GATK
SHORE
R
dhyper

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