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Tuber borchii mycelium (strain 1BO) is able to utilise glucose, fructose or mannitol in the culture medium as a carbohydrate source. Since sugars not only function as a metabolic resource and structural constituent of cells, but also act as important regulators of various processes, we investigated if high sugar concentrations could influence fungal growth and development. The studies performed in this paper revealed that fructose or mannitol used at high concentration (50 g l−1) in the culture medium do not influence the growth and the biochemical responses of fungus but the growth of T. borchii mycelium is subject to glucose repression. In experiments with a high glucose concentration (50 g l−1) and with 2-deoxyglucose, a non-metabolisable glucose analogue, the growth of T. borchii was halved with respect to the control (10 g l−1 of glucose). The morphological and biochemical analyses revealed that the hyphae were metabolically and functionally active, but the activity of mannitol dehydrogenase was reduced to one-third in the high glucose treatment. This is the first evidence of glucose repression of growth and activity in the ascomycetous ectomycorrhizal fungus T. borchii.
Four strains of Tuber borchii were grown in liquid medium containing glucose. Evaluation of growth patterns revealed a trend of
exponential growth for only one strain. Subsequently, enzyme levels were assayed and polypeptide and mRNA electrophoretic
profiles were analyzed. Although the four strains were found to have many properties in common such as the growth behaviours for
three strains and the levels of some glycolytic enzymes, the polypeptide and mRNA electrophoretic patterns highlighted intraspecific
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