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Abstract:

Alternaria arborescens is the causal agent of tomato stem canker, a disease frequently responsible of substantial economic losses. A. arborescens can produce several mycotoxins, such as alternariol, alternariol monomethyl ether and tenuazonic acid and phytotoxins such as the AAL toxins. The objective of this study was to determine the effect of water activity (aw, 0.950, 0.975, 0.995) and temperature (6, 15, 20, 25 and 30°C) on the germination and radial growth rate of A. arborescens on a synthetic tomato medium. Germination followed by growth was observed at all temperatures and aw levels analyzed. The shortest germination time (0.5days) was observed at 0.995 aw, both at 25°C and at 30°C. The germination time increased with a reduction of aw and temperature. The highest growth rate was registered at 0.995 aw and 30°C (7.21mm/day) while the lowest occurred at 0.950 aw and 6°C (0.52mm/day), conditions at which the longest lag phase was observed (8days). Growth rates increased with aw and temperature. Knowledge of the ecophysiology of the fungus in this substrate is necessary to formulate future strategies to prevent its development and evaluate the consumer health risk posed by potential exposure to the toxins. © 2014 Elsevier B.V.

Registro:

Documento: Artículo
Título:Water activity and temperature effects on growth of Alternaria arborescens on tomato medium
Autor:Vaquera, S.; Patriarca, A.; Fernández Pinto, V.
Filiación:Laboratorio de Microbiología de Alimentos, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Alternaria arborescens; Germination; Growth; Temperature; Tomato medium; Water activity; water; Alternaria; Alternaria arborescens; Argentina; article; controlled study; ecophysiology; fungal strain; fungus growth; germination; growth rate; nonhuman; stem canker; temperature; temperature sensitivity; tomato; Alternaria arborescens; Germination; Growth; Temperature; Tomato medium; Water activity; Alternaria; Food Microbiology; Lycopersicon esculentum; Spores, Fungal; Temperature; Water
Año:2014
Volumen:185
Página de inicio:136
Página de fin:139
DOI: http://dx.doi.org/10.1016/j.ijfoodmicro.2014.06.007
Título revista:International Journal of Food Microbiology
Título revista abreviado:Int. J. Food Microbiol.
ISSN:01681605
CODEN:IJFMD
CAS:water, 7732-18-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01681605_v185_n_p136_Vaquera

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Citas:

---------- APA ----------
Vaquera, S., Patriarca, A. & Fernández Pinto, V. (2014) . Water activity and temperature effects on growth of Alternaria arborescens on tomato medium. International Journal of Food Microbiology, 185, 136-139.
http://dx.doi.org/10.1016/j.ijfoodmicro.2014.06.007
---------- CHICAGO ----------
Vaquera, S., Patriarca, A., Fernández Pinto, V. "Water activity and temperature effects on growth of Alternaria arborescens on tomato medium" . International Journal of Food Microbiology 185 (2014) : 136-139.
http://dx.doi.org/10.1016/j.ijfoodmicro.2014.06.007
---------- MLA ----------
Vaquera, S., Patriarca, A., Fernández Pinto, V. "Water activity and temperature effects on growth of Alternaria arborescens on tomato medium" . International Journal of Food Microbiology, vol. 185, 2014, pp. 136-139.
http://dx.doi.org/10.1016/j.ijfoodmicro.2014.06.007
---------- VANCOUVER ----------
Vaquera, S., Patriarca, A., Fernández Pinto, V. Water activity and temperature effects on growth of Alternaria arborescens on tomato medium. Int. J. Food Microbiol. 2014;185:136-139.
http://dx.doi.org/10.1016/j.ijfoodmicro.2014.06.007