Differential susceptibility of blastospores and aerial conidia of entomopathogenic fungi to heat and UV-B stresses |
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| Affiliation: | 1. Departamento de Biociências e Tecnologia, Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, GO, 74690-900, Brazil;2. Laboratório de Microbiologia Ambiental, Embrapa Meio Ambiente, Jaguariúna, SP, 13820-000, Brazil;1. University of Hohenheim, Department of Parasitology, Emil-Wolff-Str. 34, 70599 Stuttgart, Germany;2. University of Hohenheim, Department of Animal Ecology, Garbenstr. 30, 70599 Stuttgart, Germany;1. Federal University of Technology/UTFPR, Biology Department, 85892000 Santa Helena, PR, Brazil;2. Embrapa Genetic Resources and Biotechnology, P.O. Box 02372, 70770-917 Brasilia DF, Brazil;3. ESALQ/University of São Paulo, Department of Entomology and Acarology, P.O. Box 9, 13418–900 Piracicaba, SP, Brazil;1. Departamento de Entomologia e Acarologia, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo (ESALQ-USP). Av. Pádua Dias, 11, C.P. 9, Piracicaba, SP 13418-900, Brazil;2. Embrapa Meio Ambiente, Rodovia SP-340, km 127.5, S/N – Tanquinho Velho, Jaguariúna, SP, 13820-000, Brazil;1. Centre for Biological Control, Department of Zoology and Entomology, Rhodes University, P. O. Box 94, Grahamstown 6140, South Africa;2. Citrus Research International, Walmer, P. O. Box 5095, Port Elizabeth 6065, South Africa |
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| Abstract: | We investigated the comparative susceptibility to heat and UV-B radiation of blastospores and aerial conidia of Metarhizium spp. (Metarhizium robertsii IP 146, Metarhizium anisopliae s.l. IP 363 and Metarhizium acridum ARSEF 324) and Beauveria bassiana s.l. (IP 361 and CG 307). Conidia and blastospores were produced in solid or liquid Adámek-modified medium, respectively, and then exposed to heat (45 ± 0.2 °C) in a range of 0 (control) to 360 min; the susceptibility of fungal propagules to heat exposures was assessed to express relative viability. Similarly, both propagules of each isolate were also exposed to a range of 0 (control) to 8.1 kJ m−2 under artificial UV-B radiation. Our results showed that fungal isolates, propagule types and exposure time or dose of the stressor source play critical roles in fungal survival challenged with UV-B and heat. Conidia of ARSEF 324, IP 363, IP 146 and IP 361 exposed to heat survived significantly longer than their blastospores, except for blastospores of CG 307. Conidia and blastospores of IP 146 and IP 363 were equally tolerant to UV-B radiation. We claim that blastospores of certain isolates may be promising candidates to control arthropod pests in regions where heat and UV-B are limiting environmental factors. |
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| Keywords: | Abiotic stress Fungal propagule Thermotolerance UV tolerance |
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