MORPHOLOGICAL CHARACTERIZATION OF RESISTANCE MELON SOURCES TO Pseudoperonospora cubensis

Authors

  • Leidiane Bezerra Albuquerque Universidade Federal Rural do Semi-Árido
  • Rafaela Priscila Antonio Embrapa Semi-Árido
  • Glauber Henrique de Sousa Nunes Universidade Federal Rural do semi-Árido - UFERSA
  • Ravier Valcácer de Medeiros Universidade Federal Rural do Semi-Árido - UFERSA
  • Antonio José Rodrigues da Silva Filho Universidade Federal Rural do Semi-Árido - UFERSA

DOI:

https://doi.org/10.1590/1983-21252015v28n312rc

Keywords:

Cucumis melo. Downy mildew. Germplasm. Resistance. Quality.

Abstract

The downy mildew, caused by the fungus Pseudoperonospora cubensis is a major foliar disease that attacks the melon crop in the rainy season in northeastern Brazil. The objective of this study was to identify and characterize morphologically resistant melon accessions to P. cubensis. Thirty-six accessions and four commercial cultivars were evaluated in a randomized block design with three replications. The plot was composed of seven plants. The evaluation was conducted in the under field conditions with a diagrammatic scale and calculating the disease percentage index (DPI). Resistance sources and references genotypes were characterized morphologically. The accessions C-RN-2, C-SE-2, C-CE-2, C-PE-2, C-PI-1, and C-BA-2 show resistance to P. cubensis and are promising for use in programs breeding for resistance to downy mildew although its fruits have reduced commercial quality.

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Published

27-08-2015

Issue

Section

Agronomy