A Japanese powdery mildew isolate with exceptionally large infection efficience on Mlo-resistant barley

M.F. Lyngkjær, H.P. Jensen, Hanne Østergård

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A Japanese field isolate (Race I) of Erysiphe graminis f,sp. hordei was tested on 17 barley lines carrying the mlo powdery mildew resistance gene. Race I produced many successful infections with infection type larger than or equal to 2 on six lines (M66, MC20, SR1, SR7, Atem and Totem). On the remaining 11 lines it reacted with infection type 0. Colony numbers on the Mlo-lines were between 2.6% and 12.9% of the numbers on a susceptible cultivar Manchuria, These numbers were larger than, or similar to those produced by isolate HL3/5, which has the highest recorded infection efficiency on Mlo-resistant cultivars. The interaction between isolates and lines was highly significant. The isolate GE3, from which HL3/5 was derived by selection, gave rise to occasional colonies corresponding to less than 0.3% of the number produced on cv. Manchuria.
    Original languageEnglish
    JournalPlant Pathology
    Volume44
    Issue number5
    Pages (from-to)786-790
    ISSN0032-0862
    DOIs
    Publication statusPublished - 1995

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