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Updated: Jun 28, 2026

A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates
11:48

A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates

Published on: October 28, 2021

Polygenic Inheritance of Partial Resistance to Fusarium oxysporum f. sp. melonis Race 1.2 in Melon

L Perchepied, M Pitrat

    Phytopathology
    |October 24, 2008
    PubMed

    Insights

    Fusarium wilt of melon, caused by Fusarium oxysporum f. sp. melonis race 1.2, is partially resistant due to multiple genetic factors. High heritability suggests effective breeding strategies for Fusarium wilt resistance in melons.

    Area of Science:

    • Plant Pathology
    • Plant Genetics

    Background:

    • Fusarium wilt, caused by Fusarium oxysporum f. sp. melonis (Fom), is a significant disease in melon production.
    • Race 1.2 strains of Fom overcome major resistance genes (Fom-1, Fom-2) and cause distinct yellowing or wilting symptoms.

    Purpose of the Study:

    • To investigate the genetic basis of partial resistance to Fusarium oxysporum f. sp. melonis race 1.2 in melon.
    • To understand the inheritance of resistance using a recombinant inbred line (RIL) population.

    Main Methods:

    • Developed a RIL population from a cross between a partially resistant ('Isabelle') and susceptible ('Védrantais') melon line.
    • Performed artificial inoculations with yellowing (TST) and wilting (D'Oléon 8) Fom race 1.2 strains across six locations.
    • Assessed disease severity using a 1-to-5 scale and Area Under the Disease Progress Curve (AUDPC).

    Main Results:

    • High heritability (0.72–0.96) for partial resistance to Fom race 1.2 was observed.
    • Estimated 4 to 14 genetic factors controlling partial resistance.
    • Phenotypic correlations were significant across locations, indicating consistent resistance expression.

    Conclusions:

    • Partial resistance to Fusarium oxysporum f. sp. melonis race 1.2 is polygenic, with high heritability.
    • This understanding can inform breeding programs for developing Fusarium wilt-resistant melon cultivars.
    • Strain-specific effects on resistance may exist but appear minor compared to the overall polygenic control.

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