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In this study, we have explored and dissected genetic variation in the responsiveness of basal defence mechanisms within a selection of <jats:italic>Arabidopsis<\/jats:italic> accessions. Responsiveness of JA\u2010induced <jats:italic>PDF1.2<\/jats:italic> gene expression was associated with enhanced basal resistance against the necrotrophic fungus <jats:italic>Plectosphaerella cucumerina<\/jats:italic> and the herbivore <jats:italic>Spodoptera littoralis<\/jats:italic>. Conversely, accessions showing augmented <jats:italic>PR\u20101<\/jats:italic> induction upon SA treatment were more resistant to the hemi\u2010biotrophic pathogen <jats:italic>Pseudomonas syringae<\/jats:italic>, and constitutively expressed defence\u2010related transcription factor (TF) genes. Unexpectedly, accessions with primed responsiveness to SA deposited comparatively little callose after treatment with microbe\u2010associated molecular patterns. A quantitative trait locus (QTL) analysis identified two loci regulating flagellin\u2010induced callose and one locus regulating SA\u2010induced <jats:italic>PR\u20101<\/jats:italic> expression. The latter QTL was found to contribute to basal resistance against <jats:italic>P. syringae<\/jats:italic>. None of the defence regulatory QTLs influenced plant growth, suggesting that the constitutive defence priming conferred by these loci is not associated with major costs on plant growth. Our study demonstrates that natural variation in basal resistance can be exploited to identify genetic loci that prime the plant's basal defence arsenal.<\/jats:p>","DOI":"10.1111\/j.1365-3040.2011.02317.x","type":"journal-article","created":{"date-parts":[[2011,3,17]],"date-time":"2011-03-17T12:29:50Z","timestamp":1300364990000},"page":"1191-1206","source":"Crossref","is-referenced-by-count":49,"title":["Genetic dissection of basal defence responsiveness in accessions of <i>Arabidopsis thaliana<\/i>"],"prefix":"10.1111","volume":"34","author":[{"given":"SHAKOOR","family":"AHMAD","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"MARIEKE","family":"VAN HULTEN","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"JANET","family":"MARTIN","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"CORN\u00c9 M. 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