Am. Daubeze et al., RESISTANCE TO LEVEILLULA-TAURICA IN PEPPER (CAPSICUM-ANNUUM) IS OLIGOGENICALLY CONTROLLED AND STABLE IN MEDITERRANEAN REGIONS, Plant breeding, 114(4), 1995, pp. 327-332
The resistance to Leveillula taurica from an african pepper line H3 (C
apsicum annuum) was evaluated and analysed, using the androgenetic hap
lodiploid progeny from an F-1 hybrid between H3 and a susceptible line
. Tests were performed in natural infection conditions in two location
s (France and Sicily). Stable behaviour of the parental and haplodiplo
id lines was observed in both locations, confirming the high level and
stability of this resistance source in Mediterranean countries. Herit
ability of resistance was high and genetic analysis suggested that it
is under oligogenic control. However, the number of genetic factors in
volved in resistance depended on infection conditions: two or three ge
netic factors with additive and partial dominance effects appear suffi
cient to confer resistance at the beginning of the epidemic or in weak
infection conditions. However, additional genes are necessary to slow
down further disease progress and secondary infections and at least f
ive genetic factors are necessary to confer resistance in severe infec
tion, In this case, both additive and epistatic effects are significan
t. The transfer of this resistance into cultivars will require the use
of artificial inoculation procedures to control the severity of the t
est.