INHERITANCE OF RESISTANCE TO POTYVIRUSES IN PHASEOLUS-VULGARIS L .4. INHERITANCE, LINKAGE RELATIONS, AND ENVIRONMENTAL-EFFECTS ON SYSTEMIC RESISTANCE TO 4 POTYVIRUSES
Ml. Fisher et Mm. Kyle, INHERITANCE OF RESISTANCE TO POTYVIRUSES IN PHASEOLUS-VULGARIS L .4. INHERITANCE, LINKAGE RELATIONS, AND ENVIRONMENTAL-EFFECTS ON SYSTEMIC RESISTANCE TO 4 POTYVIRUSES, Theoretical and Applied Genetics, 92(2), 1996, pp. 204-212
We have examined the genetics of systemic resistance in Phaseolus vulg
aris to azuki bean mosaic virus (AzMV) and cowpea aphid-borne mosaic v
irus (CABMV) and the relationship of this resistance to a phenotypical
ly similar resistance to watermelon mosaic virus (WMV) and soybean mos
aic virus (SMV). In P. vulgaris cv 'Great Northern 1140' (GN1140), res
istance to SMV and WMV has been attributed to the genes Smv and Wmv, r
espectively, which have been shown to segregate as a unit. Systemic re
sistance to AzMV is conferred by two incompletely dominant alleles, Az
m1 and Azm2, at unlinked loci. At least three resistance alleles must
be present at these two loci for systemic resistance to be expressed i
n the plant. Systemic resistance to CABMV in GN 1140 is conditioned by
a dominant allele that has been designated Cam2. Under some environme
ntal conditions, a recessive allele at an unlinked locus, cam3, also c
ontrols a resistant response to CABMV. Resistance to AzMV and CABMV do
es not assort independently from Wmv/Smv, but also does not consistent
ly cosegregate, suggesting that perhaps in each case one of the factor
s involved in resistance is associated with Smv/Wmv.