INIBIOLP   05426
INSTITUTO DE INVESTIGACIONES BIOQUIMICAS DE LA PLATA "PROF. DR. RODOLFO R. BRENNER"
Unidad Ejecutora - UE
capítulos de libros
Título:
Chapter 6 Thermotolerance of Fungal Conidia
Autor/es:
FLÁVIA R.S. PAIXÃO; NICOLÁS PEDRINI; ÉVERTON K.K. FERNANDES
Libro:
Microbes for Sustainable lnsect Pest Management An Eco-friendly Approach - Volume 1
Editorial:
Springer
Referencias:
Año: 2019; p. 185 - 196
Resumen:
Entomopathogenic fungal conidia are the most frequently propagules used in arthropod biocontrol programs. This anamorphic form is essential for the infection process, including spore germination, penetration, vegetative growth, conidiogenesis, and dissemination. Most entomopathogenic fungi are mesophilic and can develop between 10 and 40 °C, but optimal growth is between 25 and 35 °C. Abiotic factors, especially temperature (high or low) can determine their viability, virulence and success or failure of the infection process. Temperature has the highest impact on conidial stress inhibiting metabolic processes, such as decreased morphogenesis during germination, protein denaturation and membrane disorganization. Several studies show that some strains of Beauveria spp., Metarhizium spp., and Isaria spp. exhibit conidial survival even grown at high temperatures, indicating a relationship between conidial thermotolerance and their geographical isolation origin. Moreover, the high variability in fungal thermotolerance is also dependent of the culture media composition and growth condition. Entomopathogenic fungi that grow at high temperatures do not grow at low temperatures and vice versa. Moreover, when growth conditions are not set at optimal temperatures, the development of entomopathogenic fungi is affected and their effectiveness in biological control programs of arthropods is reduced. Thermal stress directly impacts on fungal strains ability to target arthropods and their environmental activity performance. The screening for fungal strains with a higher thermotolerance and the improvement on conidial formulations may aid optimize the conditions for this control agent application.