Gibberella fujikurai(imperfect stage Fusarium moniforme) a soil fungi is well known as the producer of plant growth regulator Gibberellins.
The present work was planned for the isolation of the active strains of Gibberella fujikuroi from the native paddy soils.
Twenty two strains were isolated from the infected rice seedlings collected from four local areas. Pyongtaek, Yesan, Tangjin and Sunchon and screened through the activity test for the production of Gibberellins.
The strains P-105, Y-14 and T-58 yielded higher activity than the others isolated and the referred strain IAM-8048.
The strains Y-5, Y-7, T-54 and S-152, however, were less promotive or rather inhibitory in the growth of rice seedlings.
Six different kinds of culture media developed by Gross, Raulin-Thom, Borrow, West, Stodola and Kurosawa respectively were compared with each other for the production of Gibberellins and the best result was obtained with Raulin-Thom´s media(glucose 16% and NH₄NO₃ 0.24%).
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