10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 2 2015 (April - June) Arbuscular mycorrhizal (AM) fungal species diversity patterns may vary in a plant species as influenced by soil environmental and biological factors. In the present study, lessThan i greaterThan Guizotia abyssinica lessThan /i greaterThan (L.f.) Cass., (Niger) rhizospheric soil samples were collected from 24 niger growing places belonging to 8 districts from North Karnataka, India. Rhizosphere soil samples were analysed for spore density, relative abundance and isolation frequency of AM fungal spores at genus as well as at species level and various soil physico-chemical properties were also determined. A total of 38 AM fungal morpho-species belonging to 13 genera were recorded and Genera lessThan i greaterThan Glomus lessThan /i greaterThan was found to be the most predominated. Spores belong to lessThan i greaterThan Glomus lessThan /i greaterThan , lessThan i greaterThan Acaulospora lessThan /i greaterThan , lessThan i greaterThan Gigaspora lessThan /i greaterThan and lessThan i greaterThan Sclerocystis lessThan /i greaterThan were most frequent and lessThan i greaterThan Ambispora lessThan /i greaterThan , lessThan i greaterThan Diversispora lessThan /i greaterThan , lessThan i greaterThan Quatunica lessThan /i greaterThan and lessThan i greaterThan Paraglomus lessThan /i greaterThan were less frequent. Maximum relative abundance and isolation frequency was found with lessThan i greaterThan Rhizophagus fasciculatus lessThan /i greaterThan and lessThan i greaterThan Glomus albidum lessThan /i greaterThan while, least value for relative abundance was found with lessThan i greaterThan Gigaspora marginata lessThan /i greaterThan and isolation frequency was with many AM fungal morpho-species. LAKSHMAN H.C AND CHANNABASAVA A. Rhizophagus, Guizotia abyssinica, Glomus, North Karnataka, Relative abindance, Isolation frequency. 27-35