Expression of inoculum and family specific responses in the ponderosa pine-western gall rust pathosystem

James A. Walla, Gerald A. Tuskan, John E. Lundquist, Chengguo Wang

    Research output: Contribution to journalArticlepeer-review

    1 Scopus citations

    Abstract

    Host-pathogen interactions in the ponderosa pine-western gall rest pathosystem were studied using seedlings from eight open-pollinated mother-tree families and Peridermium harknessii aeciospores from two geographically separate sources. Pregall symptoms occurred on seedlings by 4 days after inoculation (DAI). Gall occurrence was essentially complete by 230 DAI. Of three measured pigments, light red and dark red pigments on the needles developed most rapidly. Light red pigment on the base of the needles between 21 and 66 DAI was the pregall symptom most often (i) affected by inoculum source and host family, and (ii) correlated to gall width. Pre- and postgall symptoms varied significantly (i) between inocula, and (ii) among mother-tree families. No relationship was found between field resistance ratings of the mother trees and the expression of resistance in their progeny. The inocula varied in pathogenicity, and the seedling families varied in response to infection, as shown by differences in level of incidence and site of development of pigmentation and gall size on inoculated seedlings.

    Original languageEnglish
    Pages (from-to)57-62
    Number of pages6
    JournalPlant Disease
    Volume81
    Issue number1
    DOIs
    StatePublished - 1997

    Keywords

    • Disease resistance
    • Pinus ponderosa

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