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<p>Fusarium wilt, caused by <i>Fusarium oxysporum</i> f.&#xa0;sp. <i>pisi</i> (<i>Fop</i>), is one of the most devastating diseases affecting peas worldwide. Fifty <i>Fop</i> isolates, previously collected and maintained in our laboratory collection from four pea-producing provinces of Türkiye (Bursa, Afyon, İzmir, and Aydın), were selected based on their pathogenicity values and tested for virulence on eight pea differential genotypes used for <i>Fop</i> race identification. Among the tested isolates, race&#xa0;6 was the most prevalent, observed in all provinces with a&#xa0;frequency of 40%, followed by races&#xa0;2 (34%), 5 (20%) and 1 (6%). In order to evaluate pea genotypes with regard to their resistance, two isolates representative of race&#xa0;6 were used to inoculate 22&#xa0;genotypes from breeding programs and six commercial genotypes. Little Marvel and WSU31 were included as susceptible and resistant checks for race&#xa0;6, respectively. The severity of the disease was scored and stem-lesion length was measured. Cluster analysis was performed to compare the genotypes for their reactions against race&#xa0;6, using the two race-6&#xa0;isolates B74 and B14, and the 30&#xa0;genotypes were classified into four clusters. Six genotypes from breeding programmes (078PS098, 110PS097, 121PS097, 22-B-0013, 22-B-0049, 22-B-0085) and three commercial genotypes (‘Boogie’, ‘Esprit’, and ‘Senador’) were placed in the same cluster as WSU&#xa0;31. These genotypes show promise as potential sources of resistance for future pea breeding programs. This study represents the first identification of <i>Fop</i> races and pea genotype reactions to the predominant race&#xa0;6 in Türkiye.</p>

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First Comprehensive Study of Fusarium Oxysporum F. Sp. Pisi Races in Türkiye and Reactions of Some Pea Genotypes to the Most Prevalent Race

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Mehmet Akif Gültekin,
  • Nuray Özer

摘要

Fusarium wilt, caused by Fusarium oxysporum f. sp. pisi (Fop), is one of the most devastating diseases affecting peas worldwide. Fifty Fop isolates, previously collected and maintained in our laboratory collection from four pea-producing provinces of Türkiye (Bursa, Afyon, İzmir, and Aydın), were selected based on their pathogenicity values and tested for virulence on eight pea differential genotypes used for Fop race identification. Among the tested isolates, race 6 was the most prevalent, observed in all provinces with a frequency of 40%, followed by races 2 (34%), 5 (20%) and 1 (6%). In order to evaluate pea genotypes with regard to their resistance, two isolates representative of race 6 were used to inoculate 22 genotypes from breeding programs and six commercial genotypes. Little Marvel and WSU31 were included as susceptible and resistant checks for race 6, respectively. The severity of the disease was scored and stem-lesion length was measured. Cluster analysis was performed to compare the genotypes for their reactions against race 6, using the two race-6 isolates B74 and B14, and the 30 genotypes were classified into four clusters. Six genotypes from breeding programmes (078PS098, 110PS097, 121PS097, 22-B-0013, 22-B-0049, 22-B-0085) and three commercial genotypes (‘Boogie’, ‘Esprit’, and ‘Senador’) were placed in the same cluster as WSU 31. These genotypes show promise as potential sources of resistance for future pea breeding programs. This study represents the first identification of Fop races and pea genotype reactions to the predominant race 6 in Türkiye.