Effect of water activity and temperature on growth of Alternaria alternata on a synthetic tomato medium
Alternaria alternata is a toxigenic fungus, predominantly responsible for Blackmould of ripe tomato fruits, a disease frequently causing substantial losses of tomatoes, especially those used for canning. The objective of this study was to determine the effect of water activity (aw, 0.904, 0.922, 0.9...
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2009
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01681605_v135_n1_p60_Pose http://hdl.handle.net/20.500.12110/paper_01681605_v135_n1_p60_Pose |
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paper:paper_01681605_v135_n1_p60_Pose2023-06-08T15:17:16Z Effect of water activity and temperature on growth of Alternaria alternata on a synthetic tomato medium Patriarca, Andrea Rosana Pardo, Alejandro Guillermo Alternaria alternata Growth Temperature Tomato Water activity Alternaria alternata article conidium controlled study culture medium ecophysiology food control fungal spore germination fungal strain fungus growth growth rate health hazard incubation temperature nonhuman temperature tomato water content Alternaria Argentina Colony Count, Microbial Consumer Product Safety Food Contamination Food Microbiology Food Preservation Kinetics Lycopersicon esculentum Mycotoxins Temperature Time Factors Water Alternaria alternata Fungi Lycopersicon esculentum Alternaria alternata is a toxigenic fungus, predominantly responsible for Blackmould of ripe tomato fruits, a disease frequently causing substantial losses of tomatoes, especially those used for canning. The objective of this study was to determine the effect of water activity (aw, 0.904, 0.922, 0.954, 0.982) and temperature (6, 15, 21 and 35 °C) on germination and radial growth rate on a synthetic tomato medium of a cocktail inoculum of five strains of A. alternata isolated from tomato fruits affected by Blackmould. The shortest germination time (1.5 days) was observed at 0.982 aw, both at 21 °C and 35 °C. The germination time increased with a reduction on aw. The fastest growth rate was registered at 0.982 aw and 21 °C (8.31 mm/day). Growth rates were higher when aw increased. No growth or germination was observed at the lowest aw level evaluated (0.904) after 100 days of incubation at 6 °C and 15 °C. A temperature of 6 °C caused a significant reduction in growth rates, even at the optimum aw level. The knowledge on the ecophysiology of the fungus in this substrate is necessary to elaborate future strategies to prevent its development and evaluate the consumer health risk. © 2009 Elsevier B.V. All rights reserved. Fil:Patriarca, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pardo, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01681605_v135_n1_p60_Pose http://hdl.handle.net/20.500.12110/paper_01681605_v135_n1_p60_Pose |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Alternaria alternata Growth Temperature Tomato Water activity Alternaria alternata article conidium controlled study culture medium ecophysiology food control fungal spore germination fungal strain fungus growth growth rate health hazard incubation temperature nonhuman temperature tomato water content Alternaria Argentina Colony Count, Microbial Consumer Product Safety Food Contamination Food Microbiology Food Preservation Kinetics Lycopersicon esculentum Mycotoxins Temperature Time Factors Water Alternaria alternata Fungi Lycopersicon esculentum |
| spellingShingle |
Alternaria alternata Growth Temperature Tomato Water activity Alternaria alternata article conidium controlled study culture medium ecophysiology food control fungal spore germination fungal strain fungus growth growth rate health hazard incubation temperature nonhuman temperature tomato water content Alternaria Argentina Colony Count, Microbial Consumer Product Safety Food Contamination Food Microbiology Food Preservation Kinetics Lycopersicon esculentum Mycotoxins Temperature Time Factors Water Alternaria alternata Fungi Lycopersicon esculentum Patriarca, Andrea Rosana Pardo, Alejandro Guillermo Effect of water activity and temperature on growth of Alternaria alternata on a synthetic tomato medium |
| topic_facet |
Alternaria alternata Growth Temperature Tomato Water activity Alternaria alternata article conidium controlled study culture medium ecophysiology food control fungal spore germination fungal strain fungus growth growth rate health hazard incubation temperature nonhuman temperature tomato water content Alternaria Argentina Colony Count, Microbial Consumer Product Safety Food Contamination Food Microbiology Food Preservation Kinetics Lycopersicon esculentum Mycotoxins Temperature Time Factors Water Alternaria alternata Fungi Lycopersicon esculentum |
| description |
Alternaria alternata is a toxigenic fungus, predominantly responsible for Blackmould of ripe tomato fruits, a disease frequently causing substantial losses of tomatoes, especially those used for canning. The objective of this study was to determine the effect of water activity (aw, 0.904, 0.922, 0.954, 0.982) and temperature (6, 15, 21 and 35 °C) on germination and radial growth rate on a synthetic tomato medium of a cocktail inoculum of five strains of A. alternata isolated from tomato fruits affected by Blackmould. The shortest germination time (1.5 days) was observed at 0.982 aw, both at 21 °C and 35 °C. The germination time increased with a reduction on aw. The fastest growth rate was registered at 0.982 aw and 21 °C (8.31 mm/day). Growth rates were higher when aw increased. No growth or germination was observed at the lowest aw level evaluated (0.904) after 100 days of incubation at 6 °C and 15 °C. A temperature of 6 °C caused a significant reduction in growth rates, even at the optimum aw level. The knowledge on the ecophysiology of the fungus in this substrate is necessary to elaborate future strategies to prevent its development and evaluate the consumer health risk. © 2009 Elsevier B.V. All rights reserved. |
| author |
Patriarca, Andrea Rosana Pardo, Alejandro Guillermo |
| author_facet |
Patriarca, Andrea Rosana Pardo, Alejandro Guillermo |
| author_sort |
Patriarca, Andrea Rosana |
| title |
Effect of water activity and temperature on growth of Alternaria alternata on a synthetic tomato medium |
| title_short |
Effect of water activity and temperature on growth of Alternaria alternata on a synthetic tomato medium |
| title_full |
Effect of water activity and temperature on growth of Alternaria alternata on a synthetic tomato medium |
| title_fullStr |
Effect of water activity and temperature on growth of Alternaria alternata on a synthetic tomato medium |
| title_full_unstemmed |
Effect of water activity and temperature on growth of Alternaria alternata on a synthetic tomato medium |
| title_sort |
effect of water activity and temperature on growth of alternaria alternata on a synthetic tomato medium |
| publishDate |
2009 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01681605_v135_n1_p60_Pose http://hdl.handle.net/20.500.12110/paper_01681605_v135_n1_p60_Pose |
| work_keys_str_mv |
AT patriarcaandrearosana effectofwateractivityandtemperatureongrowthofalternariaalternataonasynthetictomatomedium AT pardoalejandroguillermo effectofwateractivityandtemperatureongrowthofalternariaalternataonasynthetictomatomedium |
| _version_ |
1768542171401551872 |