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<p>Gamma radiation has been employed to induce mutations in seeds and to develop disease-tolerant cultivars. This study aimed to assess resistance to <i>Macrophomina phaseolina</i> in F₃ watermelon (<i>Citrullus lanatus</i>) genotypes derived from seeds of the cultivar Sugar Baby irradiated with 200&#xa0;Gy of Co-60 gamma rays. The experiment was conducted in a greenhouse using a completely randomised design, with 14 treatments, and five replicates. The assay was repeated. The materials evaluated included the melon (<i>Cucumis melo</i>) accession Ag-15591Ghana (G1), non-irradiated Sugar Baby watermelon (G2), and five irradiated watermelon genotypes (G3–G7), obtained through controlled manual pollinations from seeds previously exposed to 200&#xa0;Gy of gamma radiation. Plants were inoculated with <i>M. phaseolina</i> isolate A11P17, and disease severity was assessed 30 days post-inoculation using a 0–5 rating scale. Genotypes G1 and G2 were susceptible, whereas the irradiated genotypes, particularly G4, exhibited higher frequencies of resistant individuals. The observed genetic variability suggests that gamma irradiation is a promising strategy for improving resistance to <i>M. phaseolina</i> in watermelon, with the potential to reduce disease impact and support yield stability.</p>

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Co-60 gamma irradiation induces variation in F₃ watermelon resistance to Macrophomina phaseolina

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月9日

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  • Aline Kelly de Aquino Lima Cipriano,
  • Edicleide Macedo da Silva,
  • Andréia Mitsa Paiva Negreiros,
  • Willianny Karem de Sousa,
  • Deisy Alexandra Rosero Alpala,
  • Glauber Henrique de Sousa Nunes,
  • Rui Sales Júnior,
  • Ioná Santos Araújo Holanda

摘要

Gamma radiation has been employed to induce mutations in seeds and to develop disease-tolerant cultivars. This study aimed to assess resistance to Macrophomina phaseolina in F₃ watermelon (Citrullus lanatus) genotypes derived from seeds of the cultivar Sugar Baby irradiated with 200 Gy of Co-60 gamma rays. The experiment was conducted in a greenhouse using a completely randomised design, with 14 treatments, and five replicates. The assay was repeated. The materials evaluated included the melon (Cucumis melo) accession Ag-15591Ghana (G1), non-irradiated Sugar Baby watermelon (G2), and five irradiated watermelon genotypes (G3–G7), obtained through controlled manual pollinations from seeds previously exposed to 200 Gy of gamma radiation. Plants were inoculated with M. phaseolina isolate A11P17, and disease severity was assessed 30 days post-inoculation using a 0–5 rating scale. Genotypes G1 and G2 were susceptible, whereas the irradiated genotypes, particularly G4, exhibited higher frequencies of resistant individuals. The observed genetic variability suggests that gamma irradiation is a promising strategy for improving resistance to M. phaseolina in watermelon, with the potential to reduce disease impact and support yield stability.