The complex resistance to cucumber mosaic cucumovirus (CMV) in the melon accession PI161375 is governed by one gene and at least two quantitative trait loci

cmv1 is a gate for Cucumber mosaic virus transport from bundle sheath cells to phloem in melon

“…Interestingly, the melon resistant accession SC also supports cell‐to‐cell movement and accumulation in the veins of both LS and FNY strains. As SC carries at least three QTLs conferring resistance to several strains of CMV (Guiu‐Aragonés et al ., ), this indicates that none of the described QTLs impair either the replication or the cell‐to‐cell movement of CMV. Therefore, these QTLs should also be involved in restricting long‐distance movement of the virus in the resistant parent accession, either cooperating with cmv1 in facilitating phloem entry, or having a role in the movement of the virus once it is in the phloem.…”

“…This confirms previous observations, indicating that the resistance mediated by cmv1 does not act at the level of virus accumulation (Guiu‐Aragonés et al ., ) and also that the resistance does not act on mesophyll cell‐to‐cell movement. Interestingly, both strains were also localized along the veins of the resistant parental line SC, which carries at least three genes involved in resistance to CMV (Guiu‐Aragonés et al ., ). Thus, although providing resistance to both viral strains, these additional genes present in SC do not prevent viral replication or cell‐to‐cell movement in the inoculated leaf.…”

“…Recessive resistances to CMV are mostly related to the inhibition of cell-to-cell or systemic virus movement, or both (Canto and Palukaitis, 2001;Caranta et al, 2002;Dufour et al, 1989;Kang et al, 2005;Kobori et al, 2000;Ohnishi et al, 2011;Sekine et al, 2004;Stamova and Chatelat, 2000;Valkonen and Watanabe, 1999;Yoshii et al, 2004). The genetic inheritance of this trait is usually polygenic, and several quantitative trait loci (QTLs) conferring resistance to CMV have already been described in different systems (Caranta et al, 2002;Chaim et al, 2001;Guiu-Aragon es et al, 2014;Ohnishi et al, 2011;Palukaitis and Garcia-Arenal, 2003;Pitrat, 2002). In melon, several QTLs conferring resistance to some strains of CMV have been identified (Guiu-Aragon es et al, 2014;Pitrat, 2002).…”

“…The genetic inheritance of this trait is usually polygenic, and several quantitative trait loci (QTLs) conferring resistance to CMV have already been described in different systems (Caranta et al, 2002;Chaim et al, 2001;Guiu-Aragon es et al, 2014;Ohnishi et al, 2011;Palukaitis and Garcia-Arenal, 2003;Pitrat, 2002). In melon, several QTLs conferring resistance to some strains of CMV have been identified (Guiu-Aragon es et al, 2014;Pitrat, 2002). In the melon accession PI 161375, cultivar 'Songwhan Charmi' (SC), the gene cmv1 confers recessive resistance to CMV strains from subgroup II, but not to strains of subgroup I (Essafi et al, 2009;Guiu-Aragon es et al, 2015).…”

“…In the melon accession PI 161375, cultivar 'Songwhan Charmi' (SC), the gene cmv1 confers recessive resistance to CMV strains from subgroup II, but not to strains of subgroup I (Essafi et al, 2009;Guiu-Aragon es et al, 2015). Resistance to CMV strains of subgroup I requires two addi-tional QTLs (Guiu-Aragon es et al, 2014). The avirulence determinant of subgroup II viruses has been mapped to the MP gene.…”