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<p><i>Fusarium proliferatum</i> can survive in both seed and soil, potentially causing root and crown rot disease in various plant species. In this study, an evaluation of pumpkin for reaction to the disease using soil infestation of <i>F.&#xa0;proliferatum</i>, was conducted on summer pumpkin cultivars (cvs. Çağlayan, Mert Bey, Sena Hanım and TG38) under controlled conditions. The cultivars were cultivated in soil that had been artificially inoculated with the pathogen. Disease severity, plant growth parameters and phenolic compound accumulation in roots were assessed, with phenolic compounds quantified using high-performance liquid chromatography (HPLC). The lowest disease severity (15.12%) was determined in cv. TG38, followed by cvs. Çağlayan (28.25%) and Mert Bey (31.00%), with cv. Sena Hanım showing the highest level (43.95%). However, cvs. Çağlayan and Mert Bey demonstrated less reduction in leaf number, fresh and dry weight of shoot compared to cv. TG38. <i>P</i> <i>-</i>coumaric acid was the phenolic compound that exhibited high increases in infected plants, with values of 7.26-, 5.97 and 4.57-fold in cvs. TG38, Çağlayan and Mert Bey with low disease severities, respectively. A&#xa0;significant negative correlation was detected between the increase in the amount of only <i>p</i>-coumaric acid among the phenolic compounds and disease severity. In <i>in vitro</i> tests, <i>p</i>-coumaric acid also highly inhibited germ tube length of <i>F.&#xa0;proliferatum</i>, with an EC<sub>50</sub> of 4.2 mM, as opposed to 5.4 mM for mycelial growth and 46.0 mM for conidial germination. These findings suggest that <i>p</i>-coumaric acid may contribute to pumpkin resistance to soil infestation by <i>F.&#xa0;proliferatum</i>.</p>

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Reactions of Some Summer Pumpkin Cultivars to Root and Crown Rot Caused by Soil Infestation with Fusarium Proliferatum: Assessment Based On Disease Severity, Growth Parameters and Phenolic Compounds

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Ebru Sevinç,
  • Nuray Özer,
  • Nagehan Desen Köycü

摘要

Fusarium proliferatum can survive in both seed and soil, potentially causing root and crown rot disease in various plant species. In this study, an evaluation of pumpkin for reaction to the disease using soil infestation of F. proliferatum, was conducted on summer pumpkin cultivars (cvs. Çağlayan, Mert Bey, Sena Hanım and TG38) under controlled conditions. The cultivars were cultivated in soil that had been artificially inoculated with the pathogen. Disease severity, plant growth parameters and phenolic compound accumulation in roots were assessed, with phenolic compounds quantified using high-performance liquid chromatography (HPLC). The lowest disease severity (15.12%) was determined in cv. TG38, followed by cvs. Çağlayan (28.25%) and Mert Bey (31.00%), with cv. Sena Hanım showing the highest level (43.95%). However, cvs. Çağlayan and Mert Bey demonstrated less reduction in leaf number, fresh and dry weight of shoot compared to cv. TG38. P -coumaric acid was the phenolic compound that exhibited high increases in infected plants, with values of 7.26-, 5.97 and 4.57-fold in cvs. TG38, Çağlayan and Mert Bey with low disease severities, respectively. A significant negative correlation was detected between the increase in the amount of only p-coumaric acid among the phenolic compounds and disease severity. In in vitro tests, p-coumaric acid also highly inhibited germ tube length of F. proliferatum, with an EC50 of 4.2 mM, as opposed to 5.4 mM for mycelial growth and 46.0 mM for conidial germination. These findings suggest that p-coumaric acid may contribute to pumpkin resistance to soil infestation by F. proliferatum.