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Cucumber mosaic virus  (CMV) is one of the most devastating phytopathogens of  Capsicum . The single dominant resistance gene,  Cucumber mosaic resistant 1  ( Cmr1 ), that confers resistance to the CMV isolate P0 has been overcome by a new isolate (CMV-P1) after being deployed in pepper ( Capsicum annuum ) breeding for over 20 years. A recently identified Indian  C. annuum  cultivar, “Lam32,” displays resistance to CMV-P1. In this study, we show that the resistance in “Lam32” is controlled by a single recessive gene,  CMV resistance gene 2  ( cmr2 ). We found that  cmr2  conferred resistance to CMV strains including CMV-Korean, CMV-Fny, and CMV-P1, indicating that  cmr2  provides a broad-spectrum type of resistance. We utilized two molecular mapping approaches to determine the chromosomal location of  cmr2 . Bulked segregant analysis (BSA) using amplified fragment-length polymorphism (AFLP) (BSA-AFLP) revealed one marker, cmvAFLP, located 16 cM from  cmr2 . BSA using the Affymetrix pepper array (BSA-Affy) identified a single-nucleotide polymorphism (SNP) marker (Affy4) located 2.3 cM from  cmr2  on chromosome 8. We further screened a pepper germplasm collection of 4,197 accessions for additional CMV-P1 resistance sources and found that some accessions contained equivalent levels of resistance to that of “Lam32.” Inheritance and allelism tests demonstrated that all the resistance sources examined contained  cmr2 . Our result thus provide genetic and molecular evidence that  cmr2  is a single recessive gene that confers to pepper an unprecedented resistance to the dangerous new isolate CMV-P1 that had overcome  Cmr1 .

frontiers in plant science

Identification of Cucumber mosaic resistance 2 (cmr2) That Confers Resistance to a New Cucumber mosaic virus Isolate P1 (CMV-P1) in Pepper (Capsicum spp.)