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Search for resistance to gummy stem blight (Didymella bryoniae) in cucumber (Cucumis sativus L.)

  • Resistance and Tolerance
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Summary

Resistance to gummy stem blight (Didymella bryoniae) was not detected among 1208 cucumber lines of diverse origin when cotyledons of four-day-old seedlings were inoculated with an aqueous suspension of 5000 spores of D. bryoniae delivered to freshly crushed tissue, followed by 48 h incubation at 20°C and 100% RH in the dark. Among 49 lots evaluated for gummy stem blight in the field, cv. Homegreen #2 and Pl 200818 from Burma were resistant. Earliness in fruit maturity was positively correlated with susceptibility to gummy stem blight (r=0.424). Cucumber accessions differed in the incidence of stem and hypocotyl cankers. In greenhouse grown plants at the 2nd–3rd leaf stage, differentiation of resistant lines was obtained by spraying plants with an aqueous suspension of 106/ml D. bryoniae spores followed by 48 h incubation at 20°C and 100% RH in the dark. One cycle of mass selection in Homegreen #2 resulted in improved gummy stem blight resistance.

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Authors and Affiliations

  1. ARCO Plant Cell Research Institute, 6560 Trinity Ct., 94568, Dublin, CA, USA

    Anna J. Wyszogrodzka

  2. Dept. of Plant Pathology, University of Wisconsin-Madison, 1630 Linden Dr., 53706, Madison, WI, USA

    Paul H. Williams

  3. USDA-ARS, Dept. of Horticulture, University of Wisconsin-Madison, 1575 Linden Dr., 53706, Madison, WI, USA

    Clinton E. Peterson

Authors
  1. Anna J. Wyszogrodzka
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  2. Paul H. Williams
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  3. Clinton E. Peterson
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Wyszogrodzka, A.J., Williams, P.H. & Peterson, C.E. Search for resistance to gummy stem blight (Didymella bryoniae) in cucumber (Cucumis sativus L.). Euphytica 35, 603–613 (1986). https://doi.org/10.1007/BF00021869

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  • DOI: https://doi.org/10.1007/BF00021869

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