The first report on the occurrence race 9 of the tomato leaf mold pathogen Cladosporium fulvum (syn. Passalora fulva) in Cuba

Alexander Bernal-Cabrera*, Benedicto Martínez-Coca, Lidcay Herrera-Isla, Danay Ynfante-Martínez, Belkis Peteira-Delgado, Orelvis Portal, Michel Leiva-Mora, Pierre J.G.M. de Wit

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

Leaf mold caused by the fungus Cladosporium fulvum (syn. Passalora fulva) has been a serious disease in greenhouse tomatoes in Cuba, but less damage is seen in outdoor grown plants. This study was conducted to identify races of the causal agent of tomato leaf mold. A total of 36 single conidial isolates obtained from different provinces in Cuba and the reference strain race 0 were inoculated on a differential set of tomato cultivars carrying different Cf resistance genes. Further, a polymerase chain reaction (PCR) was developed using Avr9 gene-specific primers. As result, all isolates could overcome the Cf-9 resistance gene only, but not resistance genes Cf-2,Cf-4 and Cf-5 and must therefore be coined race 9. Race identity was also confirmed by PCR analysis, which showed that the Avr9 gene was not amplified in any of 36 single conidial isolates studied proving that they all lack this gene. This is the first report of the occurrence of race 9 of C. fulvum in Cuba. Pyramiding other Cf genes in hybrid of tomato may provide a more durable level of resistance to C. fulvum.

Original languageEnglish
Pages (from-to)731-736
JournalEuropean Journal of Plant Pathology
Volume160
Issue number3
Early online date27 Mar 2021
DOIs
Publication statusPublished - 2021

Keywords

  • Avr9 gene
  • Cf resistance genes
  • Race
  • Tomato leaf mold

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