Abstract
Differences in resistance to two powdery mildew isolates (R-P and R-E) were evaluated on two rose genotypes, Rosa wichurana and 'Yesterday'. Pathotype-specific resistance reactions to the developing fungus were observed by microscopy. Both rose genotypes expressed a comparable reaction, i.e., cell reactions to mycelium development of R-P. On 'Yesterday', pathotype R-E stopped growing after germination, whereas R. wichurana showed cell reactions upon inoculation with R-E. Crosses between the genotypes 'Yesterday' and R. wichurana resulted in some offspring with transgressive segregation for powdery mildew resistance. Most of the F 1 hybrids showed partial resistance by cell reactions, while others segregated for the arrested development of the germ tube of R-E as seen in 'Yesterday'. These reactions suggest that pathotype-specific resistance, based on different resistance mechanisms, can be used for resistance pyramiding in rose breeding practice.
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