C. Caranta et A. Palloix, BOTH COMMON AND SPECIFIC GENETIC-FACTORS ARE INVOLVED IN POLYGENIC RESISTANCE OF PEPPER TO SEVERAL POTYVIRUSES, Theoretical and Applied Genetics, 92(1), 1996, pp. 15-20
Absolute resistance to potato virus Y pathotype 0 (PVY 0), potyvirus E
and chili veinal mottle virus (CVMV) and a partial resistance to pota
to virus Y pathotype 1,2 (PVY 1,2) were found in an Indian pepper line
,'Perennial'. In the doubled haploid (DH) progeny from the F-1 of a cr
oss 'Perennial' by 'Yolo Wonder', resistance to CVMV was confered by t
wo independent genes, one with a clear dominant effect. Resistance to
PVY and potyvirus E was quantitatively expressed and controlled by sev
eral recessive genetic factors. Genetic analysis showed that fewer res
istance factors were necessary to explain resistance to PVY(0) and pot
yvirus E than resistance to PVY(1,2). Genetic correlations between res
istances to the different potyviruses in the DH progeny showed that mo
st of genetic factors involved in PVY(0) resistance appear to be also
involved in potyvirus E resistance, and some of these polyvalent facto
rs may be also involved in PVY(1,2) resistance but, in this case, addi
tional specific genes were necessary. One of the two CVMV resistance g
enes seems to be implicated in potyvirus E resistance. Thus, the polyg
enic resistance of 'Perennial' to these potyviruses was due both to po
lyvalent genetic factors: i.e. factors that apparently interact with s
everal viruses, and strain-specific genetic factors.