MYCELIAL GROWTH VARIATION AND COMPATIBILITY OF THE SELECTED ISOLATES OF BIPOLARIS SOROKINIANA (SACC.) SHOEMAKER

Abstract

Bipolaris sorokiniana (Sacc.) Shoemaker is a phytopathogenic fungus, causal
agent of leaf blight disease of wheat. This fungus is difficult to control because of
its immense cultural, morphological, physiological, pathogenic and genetic
variability. The aim of this investigation was to study the cultural variability of
the selected isolates of B. sorokiniana by means of mycelial compatibility. One
hundred fifty isolates of B. sorokiniana from eight districts (Dhaka, Gazipur,
Dinajpur, Joypurhat, Pabna, Sirajgonj, Kushtia and Chuadanga) of Bangladesh
were studied and cultural variation was characterized on the basis of colony
color and texture on PDA medium. They were - Black-Mat (B-M), Black-Fluffy
(B-F), Ash-Mat (A-M), Brownish Ash-Fluffy (Br. A-F), Blackish Ash-Mat (Bl.AM),
Whitish Ash-Mat (W. A-M), Greenish Ash-Fluffy (G. A-F) and Pinkish
White-Mat (P.W-M). To compare and understand cultural variability, mycelial
compatibility test was done among the cultural groups. Results revealed that
selected isolates of different cultural groups showed incompatible reaction.
Incompatibility was also noticed between the isolates of same district and
different districts.