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We investigated the optimal conditions for keratinase production by feather-degrading Pseudomonas geniculata H10 using one variable at a time (OVT) method. The optimal medium composition and cultural condition for keratinase production were determined to be glucose 0.15% (w/v), beef extract 0.08% (w/v), KH 2 PO 4 0.12% (w/v), K 2 HPO 4 0.02% (w/v), NaCl 0.07% (w/v), MgSO 4 ․ 7H 2 O 0.03%, MgCl 2 ․ 6H 2 O 0.04% along with initial pH 10 at 200 rpm and 25 ℃ , respectively. The production yield of keratinase was 31.6 U/ml in an optimal condition, showing 4.6-fold higher than that in basal medium. The strain H10 also showed plant growth promoting activities. This strain had ammonification activity and produced indoleacetic acid (IAA), siderophore and a variety of hydrolytic enzymes such as protease, lipase and chitinase. Therefore, this study showed that P. geniculata H10 could be not only used to upgrade the nutritional value of feather wastes but also useful in situ biodegradation of feather wastes. Moreover, it is also a potential candidate for the development of biofertilizing agent applicable to crop plant soil.

Keratinase Production by Recalcitrant Feather Degrading Pseudomonas Geniculata and Its Plant Growth Promoting Activity