Phani Kumari Uddandapu* Department of Botany, A.U. College of Science and Technology, Andhra University, Visakhapatnam-3, Andhra Pradesh India
K. Chandrasekhara Naidu Vemu Institute of technology, P. Kothakota, Chittoor Dist. , Andhra Pradesh India
Y. Venkateswar Rao Department of Botany, A.U. College of Science and Technology, Andhra University, Visakhapatnam-3, Andhra Pradesh India