Are tetraploid roses more resistant to powdery mildew compared to diploids?

Leen Leus, Tanya Schollaert, Marie-Christine Van Labeke, Johan Van Huylenbroeck

    Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureC3: Congres abstract

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    In roses morphological differences between tetraploids and diploids are well documented. In tetraploids thicker and larger leaves, etc. are described. However, little is known about stress resistance in polyploids. In our research we compared powdery mildew resistance in five diploid rose genotypes and their tetraploid counterparts. Four diploids derived from a well characterized cross between the diploid cultivar ‘Yesterday’ and the species Rosa wichurana were chosen for polyploidisation. The diploids differed in resistance level. Another diploid species hybrid 95/13-39 with known powdery mildew resistance was added to the test. The five selected rose genotypes were polyploidised through a treatment with the antimitotic agent oryzalin in tissue culture. Both tetraploids and diploids were acclimatized in the greenhouse and after six months powdery mildew inoculations were done on detached leaves. Two pathotypes of powdery mildew, R-E and R-P, were used. Disease development was evaluated on detached leaves after standardized inoculation using a sedimentation tower. A disease index was calculated from the scored leaves. In general the tetraploids showed an increased resistance to powdery mildew when compared to the diploids. Differences in resistance are discussed for the diploids and tetraploids tested.
    Oorspronkelijke taalEngels
    Titel25th International EUCARPIA Symposium Section Ornamentals: Crossing Borders: Book of Abstracts
    EditorsJohan Van Huylenbroeck, Emmy Dhooghe
    Publicatiedatum29-jun-2015
    Pagina's132
    ISBN van geprinte versie9789040303678
    PublicatiestatusGepubliceerd - 29-jun-2015
    Evenement25th International Eucarpia Symposium, Section Ornamentals: Crossing Borders - Melle, België
    Duur: 28-jun-20152-jul-2015

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