Some physiological studies on Penicillium expansum Link.

Penicillium expansum Link showed excellent/good growth on all carbohydrates except ribose, lactose, sorbose and sucrose, which induced fair or poor growth. It made excellent growth on mannitol and dulcitol while the rest of the carbon sources were either poorly utilized or not utilized. Sorbose neither inhibited nor promoted growth of the pathogen in the presence of good carbon sources. The pathogen showed fair/poor growth on cystine, phenylalanine, histidine, mono-HCl, histidine di-HCl, ammonium sulphate, ammonium nitrate, ammonium chloride, ammonium phosphate, and urea, while the rest of the nitrogen sources induced excellent/good growth. However, there was no growth on potassium nitrite. Cystine inhibited the growth of the pathogen to some extent in the presence of good amino acids, i.e. serine proline, methionine, arginine mono-HCl, tyrosine and tryptophane, and not at all were inhibited in the presence of the remaining amino acids.