Journal
THEORETICAL AND APPLIED GENETICS
Volume 107, Issue 2, Pages 256-262Publisher
SPRINGER
DOI: 10.1007/s00122-003-1240-1
Keywords
Rosa; Sphaerotheca pannosa; fungal races; plant resistance; genetic analysis
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Powdery mildew, caused by Podosphaera pannosa, is one of the most-severe diseases of roses grown under glass. The differentiation into physiological races and the genetic analysis of resistance in a segregating host population was investigated using single conidial isolates of the pathogen. Using ten rose genotypes, all eight isolates of the pathogen could be ascribed to different races. Five races were isolated from one location, which indicates that populations of P. pannosa exhibit a high racial diversity. Infection experiments in a backcross-population of 114 rose plants resulted in a 1:1 segregation, suggesting control by a single dominant gene. Rpp1 is the first resistance gene against rose powdery mildew to be described.
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