Reaction of <Emphasis Type="Italic">Bipolaris euphorbiae</Emphasis> to environmental factors and its tolerance to solar and ultraviolet radiation |
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Authors: | Carime Moraes Antonio Carlos Monteiro Dinalva Alves Mochi |
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Institution: | 1.Faculdade de Ciências Agrárias e Veterinárias,Universidade Estadual Paulista,Jaboticabal,Brazil |
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Abstract: | The determination of the ideal cultivation conditions and the knowledge of solar radiation tolerance are important aspects
that must be investigated for the use of Bipolaris euphorbiae Muchovej and Carvalho as a biocontrol agent. The present study was done to assess the growth rate, sporulation and viability
of the fungus cultivated under different conditions of the initial pH value of the growth medium, temperature and photoperiod.
The tolerance of this fungus’ conidia to light from a source simulating solar and ultraviolet radiation was also assessed.
B. euphorbiae was affected by different pH values of the growth medium being 6.0 the adequate pH for fungus cultivation. Incubation of
the fungus under temperatures of 22, 25 and 28°C enhanced mycelium growth, while sporulation and viability of conidia were
better at 22 and 16°C. Different regimens of exposure to light of fungal cultures only affect sporulation. Conidia exposed
to solar and ultraviolet radiation for 8 h and 90 min, respectively, presented viabilities higher than 92%, indicating high
tolerance levels to radiation exposure. |
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