Abstract
Verticillium biguttatum was able to grow axenically in a synthetic liquid medium with a compound containing ammonium or amino group as nitrogen source, glucose as carbon source and biotin as growth factor. Among various carbon and nitrogen compounds tested, highest mycelial production was achieved with mannitol and with two ammonium salts and glutamine; sporulation reached highest values with galactose and glutamine. Highest yields of mycelium and conidia were obtained at pH 4.3 and 5.1, respectively. Although neutral and alkaline conditions were growth-limiting in the synthetic medium some growth ofV.biguttatum occurred on solid media at pH 7.0 and on sclerotia ofRhizoctonia solani in natural soil at pH 7.2–7.3.
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