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European Journal of Plant Pathology

, Volume 149, Issue 4, pp 983–1000 | Cite as

A survey on tomato leaf grey spot in the two main production areas of Argentina led to the isolation of Stemphylium lycopersici representatives which were genetically diverse and differed in their virulence

  • Mario Emilio Ernesto Franco
  • Maria Inés Troncozo
  • Silvina Marianela Yanil López
  • Gustavo Lucentini
  • Rocio Medina
  • Mario Carlos Nazareno Saparrat
  • Lía Blanca Ronco
  • Pedro Alberto BalattiEmail author
Article

Abstract

Tomato gray leaf spot was first reported in Argentina in 1990. Since then, the disease has not only increased in endemic areas, but also disseminated in other tomato-growing areas. In a survey of plants with typical symptoms of Tomato grey leaf spot disease we isolated 27 Stemphylium representatives from the two main tomato-growing areas of Argentina. Cultural features such as sporulation, conidia morphometry among others revealed high variability between isolates, which was confirmed by Inter Simple Sequence Repeat (ISSR)-PCR technique. A molecular phylogenetic analysis comprising the Internal Transcribed Spacer (ITS) and the glyceraldehyde-3-phosphate dehydrogenase (gpd) gene partial sequences unambiguously identified all isolates as Stemphylium lycopersici. Based on disease severity on detached leaves, isolates were grouped in three categories (high, medium and low virulent). No correlation was found between phenotypic or genotypic characters and the geographical origin of the isolates.

Keywords

Stemphylium lycopersici Tomato gray leaf spot Morphological variability Genetic diversity Virulence Molecular phylogeny 

Notes

Acknowledgements

This research was partially supported by the Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) of the Ministro de Ciencia, Tecnología e Innovación Productiva through the projects PICT 2012-2760 (Pedro Alberto Balatti) and PICT 2015-1620 (Mario Carlos Nazareno Saparrat).

Supplementary material

10658_2017_1248_MOESM1_ESM.eps (15.1 mb)
ESM 1 Cultural characteristics of Stemphylium isolates. Pictures were taken from 7-day old cultures grown on homemade or commercial PDA at 25 °C in continuous darkness. (EPS 15464 kb)
10658_2017_1248_MOESM2_ESM.eps (2 mb)
ESM 2 Conidia of Stemphylium isolates CIDEFI-216, CIDEFI-217, CIDEFI-218 and CIDEFI-219. Pictures were taken from 7-day old cultures grown on homemade PDA at 25 °C in continuous darkness. Scale bar = 30 μm. (EPS 2033 kb)
10658_2017_1248_MOESM3_ESM.eps (103 kb)
ESM 3 One single most parsimonious tree of Stemphylium/Pleospora inferred from the concatenated ITS-gpd data set. Sequences of seven representatives of five genera of the order Pleosporales (Alternaria, Bipolaris, Cochliobolus, Pyrenophora and Setosphaeria) were chosen as outgroups. Sequences generated in this study are in bold type letter. Numbers at the nodes represents bootstrap support values as a percentage of 1000 replicates. The scale bar represents the number of nucleotide changes (steps). (EPS 103 kb)

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2017

Authors and Affiliations

  • Mario Emilio Ernesto Franco
    • 1
    • 2
  • Maria Inés Troncozo
    • 3
  • Silvina Marianela Yanil López
    • 1
    • 2
  • Gustavo Lucentini
    • 1
    • 4
  • Rocio Medina
    • 1
    • 2
  • Mario Carlos Nazareno Saparrat
    • 2
    • 3
    • 5
  • Lía Blanca Ronco
    • 1
    • 3
  • Pedro Alberto Balatti
    • 1
    • 3
    • 4
    Email author
  1. 1.Centro de Investigaciones de Fitopatología, Facultad de Ciencias Agrarias y ForestalesUniversidad Nacional de La PlataLa PlataArgentina
  2. 2.Consejo Nacional de Investigaciones Científicas y TécnicasBuenos AiresArgentina
  3. 3.Cátedra de Microbiología Agrícola, Facultad de Ciencias Agrarias y ForestalesUniversidad Nacional de La PlataLa PlataArgentina
  4. 4.Comisión de Investigaciones Científicas de la Provincia de Buenos AiresLa PlataArgentina
  5. 5.Instituto de Fisiología Vegetal, Facultad de Ciencias Naturales y Museo-Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata. CCT-La Plata-CONICETLa PlataArgentina

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