New Source of Resistance to Cucumber mosaic virus in Capsicum frutescens

Abstract

A small-fruited pungent pepper accession, Capsicum frutescens ‘BG2814-6’, is resistant to several isolates of Cucumber mosaic virus (CMV). Resistance in BG2814-6 is incompletely penetrant and is controlled by at least two major recessive genes. The accession BG2814-6 and C. annuum ‘Perennial’, the leading source of CMV tolerance, appear to share one or more CMV resistance genes. CMV was detected in uninoculated leaves in a small percentage of both BG2814-6 and Perennial plants, indicating that resistance is not absolute in either genotype. Enzyme-linked immunosorbent assay absorbance values of samples taken from inoculated leaves corresponded well with visible viral symptoms for parental genotypes. While Perennial plants accumulated CMV antigen in inoculated leaves, CMV antigen was not detected in inoculated leaves of 73% of BG2814-6 plants, suggesting that there may be a mechanistic difference in resistance between the two genotypes.

Dominant resistance against plant viruses

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Isolation, characterization and genetic diversity of NBS-LRR class disease-resistant gene analogs in multiple virus resistant line of chilli (Capsicum annuum L.)

“…It is already reported that the L gene occur in a cluster of resistance genes located on chromosome 11 in a position that apparently overlaps with resistance gene clusters in tomato and pepper (Grube et al 2000b). Lefebvre (2004) reported the existence of R-gene cluster where disease resistance QTLs for potyvirus, cucumber mosaic virus (CMV), Tomato spotted wilt virus (TSWV), and Phytophthora capsici.…”

Developmental Changes of Recessive Genes-mediated Cucumber mosaic virus (CMV) Resistance in Peppers (Capsicum annuum L.)

“…We named these resistance genes 'cmr3E' and 'cmr3L' respectively. Studies for the resistance to CMV in C. annuum have been reported many research groups, most of them were incomplete dominant and quantitatively inherited (Caranta et al, 1997(Caranta et al, , 2002Grube et al, 2000), except for Cmr1 (Kang et al, 2010). Cmr1 on the LG2 is the only dominant resistance gene known in pepper, but resistance is broken down by CMV P1 strain, requiring more robust CMV resistant germplasm (Kang et al, 2010).…”

“…In some cucurbits, resistance to CMV was controlled by one recessive gene (Kang et al, 2005), tomato and Arabidopsis have single dominant gene for resistance (Stamova and Chetelat, 2000;Takahashi et al, 2001Takahashi et al, , 2002. Several poly-genes for resistance were reported in Capsicum species including 'Perennial' (Caranta et al, 1997;Chaim et al, 2001;Grube et al, 2000;Lapidot et al, 1997), 'Vania' (Caranta et al, 2002), C. baccatum 'PI439381-1-3' (Suzuki et al, 2003) and C. frutescens 'BG2814-6' (Grube et al, 2000). In Arabidopsis and tomato, single dominant gene RCY and Cmr were suggested for resistance (Stamova and Chetelat, 2000;Takahashi et al, 2001Takahashi et al, , 2002.…”