Different Phenotypes Associated with Incompatible Races and Resistance Genes in Bacterial Spot Disease of Pepper

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Abstract
Three distinct resistance systems to Xanthomonas campestris pv. vesicatoria are distributed among plants of PI 271322 of Capsicum annuum. One plant was selected from a population of PI 271322 that was homozygous for all three resistances, and progeny of the plant were designated line 271-4. Multiplication of a strain of each incompatible race in leaves of this line ceased at different population levels. The time to host cell collapse (phenotype) after inoculation with 5 .times. 108 cfu/ml was different for each resistance and incompatible race. The phenotypes and multiplication of incompatible strains in heterozygotes differed from that in homozygotes. These resistances may be incompletely dominant.