Pathogenic Potentiality of Fungi Isolated from Seeds of Twenty BRRI Released Rice Varieties (Oryza Sativa L.)

Abstract

Twenty-five species of fungi were isolated from the seeds of twenty rice varieties (BRRI dhan 56 to BRRI dhan 75) collected from Bangladesh Rice Research Institute (BRRI). The fungi were isolated from the samples following “Tissue Planting” method and “Blotter” methods. The isolated fungi were Alternaria alternata Keissler, A. tenuissima Samuel Paul Wiltshire, Aspergillus flavus Link, A. fumigatus Fresen., A. niger Tiegh., A. ochraceus K.Wilh., A. terreus Thom., Bipolaris multiformis (Jooste) Alcorn, B. oryzae (Breda de Haan) Shoemaker, B. sorokiniana (Sacc.) Shoemaker, Chaetomium globosum Kunze ex Fr., Curvularia lunata (Wakker) Boedijn, Fusarium equiseti, (Corda) Saccardo., F. fujikuroi Nirenberg, F. oxysporum Schltdl., F. proliferatum (Matsush.) Nirenberg, Microdochium fisheri Hern.- Restr. & Crous., Nigrospora oryzae (Berk. & Br.), Penicillium Link., Pestalotiopsis oxyanthi Thum., Phanerochaete chrysosporium Burds., Rhizopus stolonifer (Ehrenb.) Vuill, Sarocladium oryzae (Sawada) W. Gams & D. Hawksw, Syncephalastrum racemosum Cohn ex J. Schrot. and Trichoderma viride Pers were isolated from the BRRI rice varieties. Among the isolated fungi, Bipolaris oryzae, Curvularia lunata, Fusarium equiseti, F. fujikurori, Microdochium fisheri and Nigrospora oryzae showed pathogenic potentiality following seed inoculation technique. These pathogenic fungi had remarkable effect on seed germination, root shoot length and mortality of rice seedlings. The present report is the first record of Microdochium fisheri as a pathogenic fungus for Bangladesh.