Open AccessGenome‐wide association mapping in Arabidopsis identifies novel genes underlying quantitative disease resistance to Alternaria brassicae
Author(s) -
Rajarammohan Sivasubramanian,
Pradhan Akshay Kumar,
Pental Deepak,
Kaur Jagreet
Publication year - 2018
Publication title -
molecular plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.945
H-Index - 103
eISSN - 1364-3703
pISSN - 1464-6722
DOI - 10.1111/mpp.12654
Subject(s) - alternaria brassicae , biology , arabidopsis , gene , genetics , alternaria , genome , plant disease resistance , resistance (ecology) , computational biology , genome wide association study , genotype , single nucleotide polymorphism , agronomy , mutant
Summary Quantitative disease resistance (QDR) is the predominant form of resistance against necrotrophic pathogens. The genes and mechanisms underlying QDR are not well known. In the current study, the Arabidopsis–Alternaria brassicae pathosystem was used to uncover the genetic architecture underlying resistance to A. brassicae in a set of geographically diverse Arabidopsis accessions. Arabidopsis accessions revealed a rich variation in the host responses to the pathogen, varying from complete resistance to high susceptibility. Genome‐wide association (GWA) mapping revealed multiple regions to be associated with disease resistance. A subset of genes prioritized on the basis of gene annotations and evidence of transcriptional regulation in other biotic stresses was analysed using a reverse genetics approach employing T‐DNA insertion mutants. The mutants of three genes, namely At1g06990 (GDSL‐motif lipase), At3g25180 (CYP82G1) and At5g37500 (GORK), displayed an enhanced susceptibility relative to the wild‐type. These genes are involved in the development of morphological phenotypes (stomatal aperture) and secondary metabolite synthesis, thus defining some of the diverse facets of quantitative resistance against A. brassicae .