Author (s): M. M. Rahman, F. M. Aminuzzaman and M. S. M. Chowdhury
Abstract
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.
J. Expt. Biosci. 4(1):1-8, January 2013
Full pdf: PDF
Key words: Morphological variation and Bipolaris sorokiniana.
J. Expt. Biosci. 4(1):1-8, January 2013
Full pdf: PDF
