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A complex network of additive and epistatic quantitative trait loci underlies natural variation of Arabidopsis thaliana quantitative disease resistance to Ralstonia solanacearum under heat stress
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International audience. Plant immunity is often negatively impacted by heat stress. However, the underlying molecular mechanisms remain poorly characterized. Based on a genome-wide association mapping approach, this study aims to identify inArabidopsis thalianathe genetic bases of robust resistance mechanisms to the devastating pathogenRalstonia solanacearumunder heat stress. A local mapping population was phenotyped against theR. solanacearumGMI1000 strain at 27 and 30 degrees C. To obtain a precise description of the genetic architecture underlying natural variation of quantitative disease resistance (QDR), we applied a genome-wide local score analysis. Alongside an extensive genetic variation found in this local population at both temperatures, we observed a playful dynamics of quantitative trait loci along the infection stages. In addition, a complex genetic network of interacting loci could be detected at 30 degrees C. As a first step to investigate the underlying molecular mechanisms, the atypical meiotic cyclinSOLO DANCERSgene was validated by a reverse genetic approach as involved in QDR toR. solanacearumat 30 degrees C. In the context of climate change, the complex genetic architecture underlying QDR under heat stress in a local mapping population revealed candidate genes with diverse molecular functions.
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