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The genomic architecture of disease resistance in lettuce

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An Erratum to this article was published on 20 March 2009

Abstract

Genbank and The Compositae Genome Project database, containing over 42,000 lettuce unigenes from Lactuca sativa cv. Salinas and L. serriola accession UC96US23 were mined to identify 702 candidate genes involved in pathogen recognition (RGCs), resistance signal transduction, defense responses, and disease susceptibility. In addition, to identify sequences representing additional sub-families of nucleotide binding site (NBS)-leucine-rich repeat encoding genes; the major classes of resistance genes (R-genes), NBS-encoding sequences were amplified by PCR using degenerate oligonucleotides designed to NBS sub-families specific to the subclass Asteridae, which includes the Compositae family. These products were cloned and sequenced resulting in 18 novel NBS sequences from cv. Salinas and 15 novel NBS sequences from UC96US23. Using a variety of marker technologies, 294 of the 735 candidate disease resistance genes were mapped in our primary mapping population, which consisted of 119 F7 recombinant inbred lines derived from an interspecific cross between cv. Salinas and UC96US23. Using markers shared across multiple genetic maps, 36 resistance phenotypic loci, including two new loci for resistance to downy mildew and two quantitative trait loci for resistance to anthracnose were positioned onto the reference map to provide a global view of the genomic architecture of disease resistance in lettuce and to identify candidate genes for resistance phenotypes. The majority but not all of the resistance phenotypes were genetically associated with RGCs.

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Acknowledgments

We thank Dean Lavelle, Robert Kays, and Amy Turnquist for technical assistance. This research was supported by Grant no. 04-35300-14601 from the National Research Initiative (NRI) Plant Genome Program of the USDA Cooperative State Research, Education and Extension Service (CSREES) and by awards DBI0421630 and DBI0211923 from the Plant Genome Program of the National Science Foundation.

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Correspondence to Richard W. Michelmore.

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Communicated by M. Xu.

An erratum to this article can be found at http://dx.doi.org/10.1007/s00122-009-1002-9

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122_2008_921_MOESM1_ESM.txt

S1. Candidate genes identified and mapped. Enabling marker information is available at http://cgpdb.ucdavis.edu/database/genome_viewer/viewer/. “Monomorphic, no sequence” indicates that amplified sequence was monomorphic between Salinas and UC96US23 by various assays, but was not sequenced. “Monomorphic, sequence” indicates that the amplified product was sequenced and found to be monomorphic between Salinas and UC96US23. “Polymorphic, assay failed” indicates that the amplified product was polymorphic; however assay to detect polymorphism were not robust. (txt 93 KB)

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McHale, L.K., Truco, M.J., Kozik, A. et al. The genomic architecture of disease resistance in lettuce. Theor Appl Genet 118, 565–580 (2009). https://doi.org/10.1007/s00122-008-0921-1

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