1. Bacterial Discovery Laboratory, Centre for Environment, Institute of Science and Technology, J. N. T. University, Kukatpally, Hyderabad 500 085, India
2. Department of Plant Sciences, School of Life Sciences, University of Hyderabad, P.O. Central University, Hyderabad 500 046, India
3. Present address: Department of Life Science, College of Natural Science, Kyonggi University, 94-6 Iui- 6 dong Yeongtong-gu, Suwon 443-760, Republic of Korea.