Abstract
Abstract Disease resistance is highly desired in roses. Especially in garden rose breeding, efforts are being made to select for plants with raised levels of resistance towards powdery mildew. Despite the description of different pathotypes of powdery mildew and the development of pathotype‐specific QTL s, pathotype‐specific virulence and resistance mechanisms are not well known. To understand resistance in roses, different evaluation methods were used: disease scoring on inoculated detached leaves, evaluation of conidia development and plant responses by cell reactions. In this study, two rose genotypes, R osa wichurana and Rosa ‘Yesterday’, were found to react differently towards two powdery mildew pathotypes (R‐E and R‐P). Although susceptible to R‐P, ‘Yesterday’ showed immunity to R‐E by arresting fungal development after conidium germination. R osa wichurana showed partial resistance to pathotype R‐P and was even more resistant to pathotype R‐E by means of increasing amounts of cell reactions. Hybridization of ‘Yesterday’ × R. wichurana resulted in a diploid F1 population (90 genotypes). This population was screened for resistance mechanism–specific segregation to both fungal pathotypes. The results of both pathotypes exhibited a wide variation in resistance among the F1 genotypes. Our results showed that resistance reactions to powdery mildew in roses do not only result in different resistance mechanisms depending on the rose genotype but were also pathotype dependent.
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Claims 9
Claim · model-written summary
The two rose genotypes reacted differently to the two powdery mildew pathotypes.
Verbatim
e0“two rose genotypes, R osa wichurana and Rosa ‘Yesterday’, were found to react differently towards two powdery mildew pathotypes (R‐E and R‐P).”
Claim · model-written summary
Yesterday was susceptible to pathotype R‐P.
Not reportedDirection
Verbatim
e0“Although susceptible to R‐P, ‘Yesterday’ showed immunity to R‐E by arresting fungal development after conidium germination.”
t0“Roses”
Claim · model-written summary
Yesterday was immunity to pathotype R‐E.
Not reportedDirection
Verbatim
e0“Although susceptible to R‐P, ‘Yesterday’ showed immunity to R‐E by arresting fungal development after conidium germination.”
t0“Roses”
Claim · model-written summary
Yesterday arrested fungal development after conidium germination against R-E.
- Taxon
- Rosest0
- Material
- ‘Yesterday’e0
- Interactor
- R‐Ee0pathogen
- Outcome
- arresting fungal development after conidium germinatione0
Not reportedDirection
Verbatim
e0“Although susceptible to R‐P, ‘Yesterday’ showed immunity to R‐E by arresting fungal development after conidium germination.”
t0“Roses”
Claim · model-written summary
R osa wichurana showed partial resistance to R‐P.
Not reportedDirection
Verbatim
e0“R osa wichurana showed partial resistance to pathotype R‐P and was even more resistant to pathotype R‐E by means of increasing amounts of cell reactions.”
Claim · model-written summary
R osa wichurana showed more resistant to R‐E.
Not reportedDirection
Verbatim
e0“R osa wichurana showed partial resistance to pathotype R‐P and was even more resistant to pathotype R‐E by means of increasing amounts of cell reactions.”
Claim · model-written summary
Increased cell reactions contributed to R osa wichurana resistance to R-E.
Verbatim
e0“R osa wichurana showed partial resistance to pathotype R‐P and was even more resistant to pathotype R‐E by means of increasing amounts of cell reactions.”
Claim · model-written summary
F1 rose genotypes varied widely in resistance to both pathotypes.
Verbatim
e0“The results of both pathotypes exhibited a wide variation in resistance among the F1 genotypes.”
t0“Roses”
Claim · model-written summary
Rose resistance mechanisms differed by genotype and powdery mildew pathotype.
Verbatim
e0“Our results showed that resistance reactions to powdery mildew in roses do not only result in different resistance mechanisms depending on the rose genotype but were also pathotype dependent.”