Articles
CAN WILD DOGROSES TAME THE FUNGAL BEAST?
Article number
690_27
Pages
181 – 188
Language
English
Abstract
Blackspot, leaf spot, powdery mildew and rust are common fungal diseases in roses.
Development of resistant cultivars is a major goal in many rose breeding programmes.
Some wild species appear to be relatively tolerant to these diseases.
The use of dogroses (section Caninae) in breeding is, however, complicated by the unique meiosis resulting in uneven chromosomal distribution in the female and male gametes.
Seedlings of five dogrose species were screened for leaf spot in an experimental field.
Apparently seedlings of Rosa rubiginosa are less affected by leaf spot compared to the other species in the study.
Two other studies concerning the occurrence of fungal diseases in dogroses are also reviewed.
In a greenhouse inoculation study, R. dumalis, R. rubiginosa and R. villosa were infected with a polysporous inoculum of Marssonina rosae. The R. rubiginosa genotypes were the least affected, with mean values below 12% infected leaves.
In another study, hybrid seedlings from crosses using Rosa dumalis and R. rubiginosa as pistillate parents and selections from section Cinnamomeae as pollen parents, were assessed in a field trial.
Infections of powdery mildew and rust were rare whereas blackspot and leaf spot were more common.
Significant differences between families with different staminate parents were found for blackspot, leaf spot and powdery mildew, indicating the possibility to select for resistance in seedlings from crosses involving section Caninae in spite of the canina meiosis.
Development of resistant cultivars is a major goal in many rose breeding programmes.
Some wild species appear to be relatively tolerant to these diseases.
The use of dogroses (section Caninae) in breeding is, however, complicated by the unique meiosis resulting in uneven chromosomal distribution in the female and male gametes.
Seedlings of five dogrose species were screened for leaf spot in an experimental field.
Apparently seedlings of Rosa rubiginosa are less affected by leaf spot compared to the other species in the study.
Two other studies concerning the occurrence of fungal diseases in dogroses are also reviewed.
In a greenhouse inoculation study, R. dumalis, R. rubiginosa and R. villosa were infected with a polysporous inoculum of Marssonina rosae. The R. rubiginosa genotypes were the least affected, with mean values below 12% infected leaves.
In another study, hybrid seedlings from crosses using Rosa dumalis and R. rubiginosa as pistillate parents and selections from section Cinnamomeae as pollen parents, were assessed in a field trial.
Infections of powdery mildew and rust were rare whereas blackspot and leaf spot were more common.
Significant differences between families with different staminate parents were found for blackspot, leaf spot and powdery mildew, indicating the possibility to select for resistance in seedlings from crosses involving section Caninae in spite of the canina meiosis.
Publication
Authors
B.U. Carlson-Nilsson, M. Uggla
Keywords
blackspot, Caninae, Diplocarpon rosae, leaf spot, Marssonina rosae, Phragmidium, Podosphaera pannosa, powdery mildew, resistance, rose-hip, rust, Sphaceloma rosarum, Sphaerotheca pannosa
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