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The genetic basis of quantitative variation in susceptibility of Arabidopsis thaliana to Pseudomonas syringae ( Pst DC3000): evidence for a new genetic factor of large effect
Author(s) -
Kover Paula X.,
Cheverud James
Publication year - 2007
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2007.01985.x
Subject(s) - pseudomonas syringae , quantitative trait locus , biology , arabidopsis thaliana , genetics , genetic variation , allele , genetic architecture , population , association mapping , arabidopsis , plant disease resistance , gene , genotype , single nucleotide polymorphism , mutant , demography , sociology
Summary• Pathogens represent an important threat to plant communities and agriculture, and can shape many aspects of plant evolution. Natural variation in plant disease susceptibility is typically quantitative, yet studies on the molecular basis of disease resistance have focused mainly on qualitative variation. • Here we investigated the genetic architecture of quantitative susceptibility to the bacterium Pseudomonas syringae by performing a quantitative trait locus (QTL) analysis on the F2 progeny of two natural accessions of Arabidopsis thaliana under two nutrient treatments. • We found that a single QTL explains most of the variation (77%) in susceptibility between accessions Columbia (Col‐0) and San Feliu‐2 (Sf‐2), and its effect is independent of nutrients. The Sf‐2 allele at this QTL is dominant and can reduce the bacterial population size by 31‐fold, much like a classical resistance ( R ) gene. However, minor QTLs, whose effects are altered by nutrient treatment, were also detected. • Surprisingly, we found that none of the QTLs for susceptibility had any effect on fruit production, suggesting that the use of resistance genes for crop improvement and evolutionary analysis of plant–pathogen interactions requires caution.