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Effect of carbon and nitrogen step down on sclerotium biomass and cord development in sclerotium rolfsii and sclerotium delphinii



Effect of carbon and nitrogen step down on sclerotium biomass and cord development in sclerotium rolfsii and sclerotium delphinii



Transactions of the British Mycological Society 86(4): 537-544



Sclerotium dry weight (biomass) in Sclerotium rolfsii and S. delphinii was significantly increased by imposing a step-down in nitrogen level through allowing growth from a medium containing 20 g/l glucose and 1.0 g/l NH4NO3 in one half of a compartmented Petri dish (side I) to the same medium with 0.25 g/l NH3NO3 in the other half (side S). Increasing the level of NH4NO3 on side I from 1.0 to 2.0 g/l further increased sclerotium biomass on side S. Lowering the glucose level on either side I or S from 20 g/l (with NH4NO3 kept constant) reduced sclerotium biomass on side S. However, formation of mycelial cords was most pronounced when mycelia grew from side I containing glucose onto a medium without glucose, onto water agar, or soil extract agar. Sclerotium formation was most abundant when cultures subjected to a nitrogen step-down were incubated in the light and in gaseous conditions approaching those of amibient air. Exposing cultures to CO2 concentrations greater than 3% for 18 days completely inhibited sclerotium production.

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