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Natural variation at XND1 impacts root hydraulics and trade-off for stress responses in Arabidopsis
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Natural variation at XND1 impacts root hydraulics and trade-off for stress responses in Arabidopsis
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Journal Article
Natural variation at XND1 impacts root hydraulics and trade-off for stress responses in Arabidopsis
2018
Overview
Soil water uptake by roots is a key component of plant performance and adaptation to adverse environments. Here, we use a genome-wide association analysis to identify the XYLEM NAC DOMAIN 1 (XND1) transcription factor as a negative regulator of
Arabidopsis
root hydraulic conductivity (
L
p
r
). The distinct functionalities of a series of natural
XND1
variants and a single nucleotide polymorphism that determines XND1 translation efficiency demonstrate the significance of
XND1
natural variation at species-wide level. Phenotyping of
xnd1
mutants and natural
XND1
variants show that XND1 modulates
L
p
r
through action on xylem formation and potential indirect effects on aquaporin function and that it diminishes drought stress tolerance. XND1 also mediates the inhibition of xylem formation by the bacterial elicitor flagellin and counteracts plant infection by the root pathogen
Ralstonia solanacearum
. Thus, genetic variation at
XND1
, and xylem differentiation contribute to resolving the major trade-off between abiotic and biotic stress resistance in
Arabidopsis
.
Soil water uptake is a major determinant of plant performance and stress tolerance. Here the authors show that, by affecting xylem formation in the root, natural variation at the
Arabidopsis XND1
locus has contrasting effects on root hydraulics and drought tolerance versus pathogen resistance.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 49
/ Arabidopsis Proteins - genetics
/ Disease Resistance - genetics
/ DNA-Binding Proteins - genetics
/ Drought
/ Droughts
/ Genomes
/ Humanities and Social Sciences
/ Plant Diseases - microbiology
/ Plants, Genetically Modified
/ Polymorphism, Single Nucleotide
/ Ralstonia solanacearum - pathogenicity
/ Science
/ Single-nucleotide polymorphism
/ Transcription Factors - genetics
/ Xylem
