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- W2088691908 abstract "Three isolates of Pisolithus tinctorius originating from different localities grew more poorly on selected carbon sources than did non-mycorrhizal fungi. The carbon utilization pattern did not change significantly with changes in composition on the basal medium or inoculum preparation, but did change with culture medium pH and addition of small amounts of glucose. An initial pH between 4 and 5 enhanced growth on disaccharides. Glucose supplementation allowed some growth on sucrose, fructose, and cellulose. Unexpectedly, respiratory activity was not necessarily accompanied by growth. Free [14C]fructose was rapidly respired to CO2 but was not used for growth. Respiration of fructose-and glucose-labelled sucrose demonstrated that glucose was readily oxidized to CO2 while much less of the fructose was oxidized. Washed mycelium nevertheless assimilated free fructose for at least 7 h with some carbon appearing in ether and hot water extractables and in residual mycelium, as well as in two successive acid hydrolysates of residual mycelium. Endogenous respiration was inhibited by certain concentrations of glucose and total respiration was only slightly higher than endogenous respiration. Nutrition may play a role in restricting growth of P. tinctorius in roots to the ectomycorrhizal form. The nutritional unavailability of cellulose, the photosynthate sucrose, fructose, pectin and pectin constituents for growth severely restricts the supply of utilizable carbon sources. Respiration of sucrose and fructose without growth would scavenge out these potential sources of inducer glucose and thus prevent induction for growth on cellulose, sucrose, and fructose and would provide energy for maintenance of the mycelium. The rapid metabolism of cellobiose would similarly prevent accumulation of inducer glucose and provide energy for maintenance." @default.
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- W2088691908 date "1987-07-01" @default.
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- W2088691908 title "Carbon nutrition and respiration of Pisolithus tinctorius" @default.
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- W2088691908 doi "https://doi.org/10.1016/s0007-1536(87)80052-9" @default.
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