The inheritance of resistance to bacterial leaf spot of lettuce caused by Xanthomonas campestris pv.vitians in three lettuce cultivars  

作　　者：Ryan J Hayes Mark A Trent Maria Jose Truco Rudie Antonise Richard W Michelmore Carolee T Bull 

机构地区：[1]United States Department of Agriculture,Agricultural Research Service,Crop Improvement and Protection Unit,Salinas,CA 93905,USA [2]The Genome Center and Department of Plant Sciences,University of California,Davis,CA 95616,USA [3]Keygene N.V.,6700 AE Wageningen,The Netherlands

出　　处：《Horticulture Research》2014年第1期1-7,共7页园艺研究（英文）

基　　金：This research was supported by the California Leafy Greens Research Program,the California Department of Food and Agriculture,USDA NRI(grant no.2008-35300-004447);USDA NIFA SCRI(grant no.2010-51181-21631).

摘　　要：Lettuce yields can be reduced by the disease bacterial leaf spot(BLS)caused by the pathogen Xanthomonas campestris pv.vitians(Xcv)and host resistance is the most feasible method to reduce disease losses.The cultivars La Brillante,Pavane and Little Gem express an incompatible host–pathogen interaction as a hypersensitive response(HR)to California strains of Xcv resulting in resistance.Little was known about the inheritance of resistance;however,resistance to other lettuce pathogens is often determined by resistance gene candidates(RGCs)encoding nucleotide-binding leucine-rich repeat(NB-LRR)proteins.Therefore,we determined the inheritance of BLS resistance in the cultivars La Brillante,Little Gem and Pavane and mapped it relative to RGCs.The reaction to Xcv was analyzed in nine F_(1),F_(2) and recombinant inbred line populations of lettuce from HR3compatible or HR3HR crosses.The HR in La Brillante,Pavane and Little Gem is conditioned by single dominant genes,which are either allelic or closely linked genes.The resistance gene in La Brillante was designated Xanthomonas resistance 1(Xar1)and mapped to lettuce linkage group 2.Xar1 is present in a genomic region that contains numerous NB-LRR encoding RGCs and functional pathogen resistance loci in the RGC2 family.The Xar1 gene confers a high level of BLS resistance in the greenhouse and field that can be introgressed into commercial lettuce cultivars to reduce BLS losses using molecular markers.

关 键 词：CULTIVAR XANTHOMONAS CAMPESTRIS 

分 类 号：S63[农业科学—蔬菜学]