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Idesia (Arica)

versión On-line ISSN 0718-3429

Idesia vol.31 no.2 Arica jun. 2013

http://dx.doi.org/10.4067/S0718-34292013000200014 

NOTA CIENTÍFICA

 

First report of tomato bacterial canker Clavibacter michiganensis subsp. michiganensis on tomato crops in Arica

Primer reporte de cancro bacteriano Clavibacter michiganensis subsp. michiganensis en plantas de tomate en Arica

 

Germán F. Sepúlveda Chavera1*, Ricardo Salvatierra Martínez1, Claudio Sandoval Briones2, Robinson González Vásquez1

1 Facultad de Cs. Agronómicas, U. Tarapacá. Avda. General Velásquez 1775, Arica.
2 Facultad de Agronomía, U. de Talca. 2 Norte 685, Talca-Chile. * Autor por correspondencia: gsepulve@uta.cl


ABSTRACT

We report the isolation and determination of Clavibacter michiganensis subsp. michiganensis (Cmm) in tomato plants grown in greenhouses in the Azapa Valley with symptoms consistent in bacterial canker. Determination was based on growth on selective media and serological tests. This is the first record of Cmm in the Azapa valley.

Key words: bacterial spot disease, grafted tomato, horticultural crops.


RESUMEN

Se informa el aislamiento y determinación de Clavibacter michiganensis subsp. michiganensis (Cmm) en plantas de tomate bajo malla en el valle de Azapa, y sintomatología consistente con cancro bacteriano. La determinación se realizó a partir de crecimiento en medios selectivos y pruebas serológicas. Este es el primer registro de Cmm en el valle de Azapa.

Palabras clave: mancha bacterial, tomate injertado, cultivos hortícolas.


 

Introduction

In the region of Arica and Parinacota, Chile, the tomato (Solanum lycopersicum L.) is the most cultivated vegetable, mainly in the Azapa Valley, where it is grown intensively and the highest yields of the country are obtained (ODEPA, 2010). Arica sustains tomato consumption in Chile in winter (June to October); around 700 ha are cultivated annually, 13% of the area planted in tomatoes for fresh consumption in the country (ODEPA, 2012).

One of the most important phytopathological problems in the tomato producing areas in Chile is bacterial canker disease, known until 1983 as Corynebacterium michiganensis but currently classified as Clavibacter michiganensis subsp. michiganensis (Cmm) (Gleason et al., 1993) The plant pathogen was first identified and studied in Chile by Nome and Docampo, (1969) and Latorre and Nome, (1970); in the tomato production in Quillota it is one of diseases to which most attention has been given (Besoain y Chaguan, 2007; Besoain et al., 2000; Vega et al., 2000; Alvarez et al., 1995; Riquelme et al., 1994), since this disease is characterized by severe attacks both outdoors and in greenhouses (Chang et al., 1991). The first symptom of the disease is marginal wilting of leaflets; necrotic streaks subsequently appear, extending from the bottom of the stem to the point where it joins the stem stalk. Under certain conditions the necrotic spots may open and cankers occur as a secondary source of infection (Borboa et al., 2009); infected plants can survive until harvest and sporadically small necrotic spots surrounded by a clear halo appear in the fruit, which are known as "bird's eyes" (Blancard, 1996). In the Azapa Valley there were no records of symptoms of bacterial canker attacks before the 2012 season.

The aim of this note is to record the presence and identification of Clavibacter michiganensis subsp. michiganensis (Smith), tomato bacterial canker in greenhouses in the Azapa Valley region of Arica and Parinacota, Chile.

Materials and Methods

Bacterial isolation and identification

In December, 2012 tomato plants of the commercial cultivar Luciana® (=Airton) grafted on commercial rootstocks Amstrong® (Syngenta, Switzerland) with symptoms of bacterial canker (Figure 1) were collected in two greenhouses in the Azapa valley. The bacteria were isolated from the plant samples in nutritive media (King B) (Merck, Chile). Isolates were initially identified on the basis of colony characteristics and cell morphology (color, shape, motility and size), and Gram's reaction with 3% KOH (Gregersen, 1978). The species was subsequently identified from growth and comparison of three semi-selective media sCNS (Shepherd, 1999), mSCM (Bolkan et al., 1996) and D2ANX (Chun, 1982) and the result of Cmm specific serological tests (Inmuno-strip®, AGDIA incorporated, USA) that was performed on the colonies and plant samples.

Figure 1. Symptoms of Cmm in Tomato plants and fruit. A: Field symptoms of Tomato Bacterial Canker on commercial cultivar Luciana® grafted on commercial rootstocks Amstrong® (Syngenta, Switzerland). B: Adventicious root in stem of tomato plants. C and E: Bird's eye lesion on tomato fruit. D: Stem canker on tomato plant.

Results

All colonies isolated listed were Gram + and subsequently identified as Cmm according to their morphology on selective media and the positive result in the serological test. In Azapa Valley there were no records of attack symptoms of bacterial canker until the 2012 season; its presence may be associated with the use of seedlings of tomatoes of other regions where the disease is present. In the future we will use PCR identification and pathogenicity tests to provide more conclusive results.

 

Acknowledgements

Thanks to Project Cod. 9742-2012 and FIA PYT 2012-0024 for financial support.

 

Bibliographic References

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Bolkan, H.A.; Waters, C.M. and Fatmi, M. 1996. ISTA Handbook On Seed Health Testing, Working Sheet N° 67. Zurich, Switzerland.         [ Links ]

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Vega, E.; Ureta, T. y Campos, G. 2000. Aumento de la incidencia de Clavibacter michiganensis subsp. michiganensis, agente causal de la enfermedad cancro bacteriano del tomate, en el cultivo del tomate de la última temporada. X Congreso chileno de Fitopatología. Valdivia - Chile.         [ Links ]

 

Fecha de Recepción: 18 Enero, 2013. Fecha de Aceptación: 22 Marzo, 2013.