A review of host major-gene resistance to potato viruses X, Y, A and V in potato: genes, genetics and mapped locations

Abstract

In view of modern developments in the technologies available for breeding potatoes for resistance to virus diseases, it is timely to review the host major genes that confer resistance, in Solanum species, to potato viruses X, Y, A and V (the viruses for which the resistance genes have been most extensively studied). Over the course of 60 years, many such genes in Solanum species have been characterized: a comprehensive list is presented. Inheritance studies are reviewed, including linkage studies and molecular mapping, and the positions of resistance genes mapped so far are listed. It is apparent from recent research that disease resistance genes are often clustered in particular regions of the chromosomes; the signi®cance of these resistance gene clusters is discussed. The information presented will be useful for potato breeding, and for genetic and mapping studies and gene cloning.

Evaluation of a SCAR RYSC3 Marker of the Ry adg Gene to Select Resistant Genotypes to Potato Virus Y (PVY) in the INIA Potato Breeding Program

“…The apparition and propagation of new recombinants has caused enough damage in potato seed certification systems in North America (Lorenzen, J., 2006 (Solomon-Blackburn and Barker, 2001a). Plants have developed diverse mechanisms to overcome the attack of phytopathogens that can be used to develop resistant cultivars within an integrated control strategy.…”

“…& Bukasov) Hawkes (Ry adg ), S. chacoense Bitter (Rychs), and S. stoloniferum Schltdl. & Bouché (Ry sto ) that presented extreme resistance to all PVY strains (Solomon-Blackburn and Barker, 2001a).…”

Study on Inheritance of Potato virus X Resistance in Capsicum annuum

“…The resistance in CV3 appeared to be controlled by two complementary dominant genes. Such inheritance patterns have not been reported for PVX resistance in potato (Solomon et al, 2001). This may be due to difficulty in manipulating resistance genes with a complex inheritance pattern in a breeding procedure (Hemenway et al, 1990;Hemenway et al, 1988).…”

“…PVX and its interaction with resistance genes have been very well characterized in potato (Solomon-Blackburn et al, 2001). Two types of resistance response have been identified in potato: hypersensitive resistance (HR) and extreme resistance (ER) (Cockerham, 1970).…”

“…It has been known that HR is associated with prevention of virus movement (Malcuit et al, 1999) whereas ER acts on inhibition of virus accumulation (Kohm et al, 1993). Both types of resistance genes are inherited in a monogenic dominant fashion (Solomon-Blackburn et al, 2001). Nx and Nb, related to HR, are located on the long arm of chromosome IX (Tommiska et al, 1998) and in the middle of chromosome V, respectively (Marano et al, 2002).…”