Author (s):  M. M. Rahman, F. M. Aminuzzaman and M. S. M. Chowdhury
Sixty nine isolates of Bipolaris sorokiniana were isolated from leaf and seeds of 21 varieties of wheat collected from 7 major wheat growing regions of Bangladesh. The collected isolates differed significantly in respect of mycelia growth, conidia production ability, shape, color, size and septation of conidia. The radial mycelia growth rate ranged from 1.96 ± 0.56 mmday-1 to 5.83 ± 0.02 mmday-1 while the highest mycelia growth rate was found in JJRBS 18. Maximum number of conidia cm-2 (119.21 ± 41.29 ×10³) was counted from isolate JJRPL 01 and minimum (2.79 ± 0.58 ×10³) from MGMSL 07. Most of the isolates produced deep brown colored conidia while 2 isolates failed to produce conidia after 15 days of incubation. Conidia of most of the isolates were straight shaped. Highest length of conidia (72.74 ±1.27 µm) was recorded in isolate JJRSS 03 while lowest (36.80 ± 6.03 µm) in isolate PIRPL 08. The isolate MGMSL 08 showed highest breadth (17.65 ± 0.98 µm) of conidia was recorded, while lowest (11.42 ±1.29 µm) in isolate SNNSL 01. The isolates were classified into nine cultural groups based on colony morphology and colony color. Maximum 23 isolates showed effuse blackish white irregular (EBWI) colony with a frequency of 33.33% of the collected isolates.

Key words: Morphological variation and Bipolaris sorokiniana.

J. Expt. Biosci. 4(1):1-8, January 2013

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