Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite Pathogen Neozygites floridana
Neozygites floridana is an obligate mite pathogenic fungus in the Entomophthoromycota. It has been suggested that resting spores of this fungus are produced as a strategy to survive adverse conditions. In the present study, possible mechanisms involved in the regulation of resting spore formation we...
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| Format: | Article |
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Wiley
2013-01-01
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| Series: | International Journal of Microbiology |
| Online Access: | http://dx.doi.org/10.1155/2013/276168 |
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| author | Vanessa da Silveira Duarte Karin Westrum Ana Elizabete Lopes Ribeiro Manoel Guedes Corrêa Gondim Junior Ingeborg Klingen Italo Delalibera Júnior |
| author_facet | Vanessa da Silveira Duarte Karin Westrum Ana Elizabete Lopes Ribeiro Manoel Guedes Corrêa Gondim Junior Ingeborg Klingen Italo Delalibera Júnior |
| author_sort | Vanessa da Silveira Duarte |
| collection | DOAJ |
| description | Neozygites floridana is an obligate mite pathogenic fungus in the Entomophthoromycota. It has been suggested that resting spores of this fungus are produced as a strategy to survive adverse conditions. In the present study, possible mechanisms involved in the regulation of resting spore formation were investigated in the hosts Tetranychus urticae and Tetranychus evansi. Abiotic and biotic factors mimicking conditions that we, based on earlier field studies, thought might induce resting spores in temperate and tropical regions were tested with isolates from Norway and Brazil. A total of 42 combinations of conditions were tested, but only one induced the formation of a high number of resting spores in only one isolate. The Brazilian isolate ESALQ1420 produced a large number of resting spores (51.5%) in T. urticae at a temperature of 11°C, photoperiod of 10L:14D, and light intensity of 42–46 (μmol m−2 s−1) on nonsenescent plants (nondiapausing females). Resting spores of the Brazilian N. floridana isolate ESALQ1421 were found at very low levels (up to 1.0%). Small percentages of T. urticae with resting spores (0–5.0%) were found for the Norwegian isolate NCRI271/04 under the conditions tested. The percentages of resting spores found for the Norwegian isolate in our laboratory studies are similar to the prevalence reported in earlier field studies. |
| format | Article |
| id | doaj-art-e056399d61894eb0bdf7a413bbb42dee |
| institution | OA Journals |
| issn | 1687-918X 1687-9198 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Microbiology |
| spelling | doaj-art-e056399d61894eb0bdf7a413bbb42dee2025-08-20T02:21:28ZengWileyInternational Journal of Microbiology1687-918X1687-91982013-01-01201310.1155/2013/276168276168Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite Pathogen Neozygites floridanaVanessa da Silveira Duarte0Karin Westrum1Ana Elizabete Lopes Ribeiro2Manoel Guedes Corrêa Gondim Junior3Ingeborg Klingen4Italo Delalibera Júnior5Department of Entomology and Acarology, ESALQ/University of São Paulo, 13418-900 Piracicaba, SP, BrazilPlant Health and Plant Protection Division, Norwegian Institute for Agricultural and Environmental Research (Bioforsk), 1432 Ås, NorwayDepartment of Agronomy, Federal Rural University of Pernambuco, 52171-900 Recife, PE, BrazilDepartment of Agronomy, Federal Rural University of Pernambuco, 52171-900 Recife, PE, BrazilPlant Health and Plant Protection Division, Norwegian Institute for Agricultural and Environmental Research (Bioforsk), 1432 Ås, NorwayDepartment of Entomology and Acarology, ESALQ/University of São Paulo, 13418-900 Piracicaba, SP, BrazilNeozygites floridana is an obligate mite pathogenic fungus in the Entomophthoromycota. It has been suggested that resting spores of this fungus are produced as a strategy to survive adverse conditions. In the present study, possible mechanisms involved in the regulation of resting spore formation were investigated in the hosts Tetranychus urticae and Tetranychus evansi. Abiotic and biotic factors mimicking conditions that we, based on earlier field studies, thought might induce resting spores in temperate and tropical regions were tested with isolates from Norway and Brazil. A total of 42 combinations of conditions were tested, but only one induced the formation of a high number of resting spores in only one isolate. The Brazilian isolate ESALQ1420 produced a large number of resting spores (51.5%) in T. urticae at a temperature of 11°C, photoperiod of 10L:14D, and light intensity of 42–46 (μmol m−2 s−1) on nonsenescent plants (nondiapausing females). Resting spores of the Brazilian N. floridana isolate ESALQ1421 were found at very low levels (up to 1.0%). Small percentages of T. urticae with resting spores (0–5.0%) were found for the Norwegian isolate NCRI271/04 under the conditions tested. The percentages of resting spores found for the Norwegian isolate in our laboratory studies are similar to the prevalence reported in earlier field studies.http://dx.doi.org/10.1155/2013/276168 |
| spellingShingle | Vanessa da Silveira Duarte Karin Westrum Ana Elizabete Lopes Ribeiro Manoel Guedes Corrêa Gondim Junior Ingeborg Klingen Italo Delalibera Júnior Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite Pathogen Neozygites floridana International Journal of Microbiology |
| title | Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite Pathogen Neozygites floridana |
| title_full | Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite Pathogen Neozygites floridana |
| title_fullStr | Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite Pathogen Neozygites floridana |
| title_full_unstemmed | Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite Pathogen Neozygites floridana |
| title_short | Abiotic and Biotic Factors Affecting Resting Spore Formation in the Mite Pathogen Neozygites floridana |
| title_sort | abiotic and biotic factors affecting resting spore formation in the mite pathogen neozygites floridana |
| url | http://dx.doi.org/10.1155/2013/276168 |
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