Energetic aspects of spore germination in filamentous fungi |
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Authors: | V ?ubíková J ?ubík |
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Institution: | (1) Institute of Experimental Phytopathology and Entomology, Slovak Academy of Sciences, 900 28 Ivánka pri Dunaji;(2) Food Research Institute, Slovak Agricultural Academy, 898 13 Bratislava |
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Abstract: | The antifungal activity of substances interfering with the function and biogenesis of mitochondria was studied. Strict anaerobiosis,
cyanide, azide, oligomycin, bongkrekic acid and ethidium bromide were found to prevent spore germination ofAspergillus niger andPenicillium italicum in liquid germination medium. The effect of azide, oligomycin and ethidium bromide was fungicidal. Cyanide and azide completely
inhibited the incorporation of14C-leucine and14C-uracil into germinating conidia ofA. niger. Oligomycin and ethidium bromide reduced the extent of incorporation of both precursors in the first few hours of conidial
germination and at later stages stopped it completely. The inhibition of both spore germination and macromolecules synthesis
during the germination ofA. niger conidia were in relation to the specific inhibitory effect of the agents on respiratory activity of dormant conidia and mycelial
cells. The results indicate that both the function of mitochondrial genetic and protein synthesizing systems and the function
of oxidative phosphorylation are essential for normal spore germination and fungal growth. |
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