1 Department of Botany, Dinabandhu Andrews College, Garia, Kolkata, West Bengal 700084, India.
2 Department of Botany, Vivekananda College, Thakurpukur, Kolkata, West Bengal 700063, India.
3 Molecular and Applied Mycology and Plant Pathology Laboratory, Centre of Advanced Study, Department of Botany, University of Calcutta, Kolkata, West Bengal 700019, India; Center for Research in Nanoscience & Nanotechnology, Technology Campus, University of Calcutta, Kolkata, West Bengal 700098, India. Electronic address: krish_paper@yahoo.com.