Table 2.

Effect of nitrogen source on β-glucosidase production in parent and mutant

Nitrogen source	β-glucosidase production (U/l)
	Parent strain (PS)	Mutant strain (PS-CM5-UM3)
Control	675.38 ± 26.80	1,339.87 ± 52.48
1 % Peptone	762.53 ± 30.45	1,797.39 ± 53.54
1 % Yeast extract	936.82 ± 39.00	1,666.67 ± 75.08
0.1 % Urea	239.65 ± 9.21	816.99 ± 34.00
0.1 % Potassium nitrate	21.79 ± 0.83	32.68 ± 0.93
0.1 % Ammonium sulfate	1,198.26 ± 42.33	1,535.95 ± 59.32
1 % Methionine	457.52 ± 16.74	359.48 ± 62.54
1 % Glycine	283.22 ± 11.34	163.40 ± 6.76