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Components of partial resistance in the slash pine-fusiform rust pathosystem.

R A Schmidt, K P Gramacho, T Miller

    Phytopathology
    |October 24, 2008
    PubMed
    Summary

    Progeny from rust-resistant slash pine families showed partial resistance to fusiform rust. These families had fewer, shorter galls and lower disease incidence in field trials, aiding tree improvement.

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    Area of Science:

    • Forestry
    • Plant Pathology
    • Genetics

    Background:

    • Fusiform rust, caused by Cronartium quercuum f. sp. fusiforme, is a major disease affecting slash pine (Pinus elliottii).
    • Understanding genetic resistance mechanisms is crucial for developing disease-resilient pine populations.

    Purpose of the Study:

    • To evaluate components of partial resistance in progeny of rust-resistant slash pine families.
    • To assess the effectiveness of these resistance components under varying experimental conditions and in field trials.

    Main Methods:

    • Greenhouse inoculation tests using Cronartium quercuum f. sp. fusiforme on slash pine seedlings.
    • Evaluation of gall frequency, gall length, and sporulation.
    • Field trials across multiple locations and years to assess disease incidence and severity.

    Main Results:

    • Slash pine families with partial resistance exhibited a higher frequency of short galls and fewer sporulating galls.
    • These resistance components were consistent across different inoculum types, concentrations, and inoculation methods.
    • Field trials confirmed lower disease incidence and severity in partially resistant families, with reduced variability.

    Conclusions:

    • Components of partial resistance identified in greenhouse tests are effective against fusiform rust in slash pine.
    • Partially resistant slash pine families are valuable for tree improvement programs and research into rust resistance genetics.