Abstract:
The experiments were conducted in the experimental field and
laboratory of Plant Pathology Division, Bangladesh Rice Research
Institute (BRR!), Gazipur during 2006-2007. Thirteen F2 lines of rice
were tested against ufra. Among the 1 146 plants of F2 population under
13 lines, 406 were found highly resistant, 216 moderately resistant, 157
resistant, 94 moderate susceptible, 61 susceptible and 212 highly
susceptible. The highly resistant and resistant plants were selected for
crossing program for the development of ufra resistant varieties. Genetic
diversity was assessed by analyzing 6 SSR and 3VNTR markers for ufra
resistant genotypes. All the markers were found polymorphic. Cluster
analysis according to the UPGMA method illustrated the genetic
relationships among the 12 ufra resistant and susceptible genotypes.
These rice genotypes had been differentiated into three main clusters. To
develop ufra resist.ant varieties and broaden the genetic base of nee
varieties new breeding program should be initiated preferably using the
parents (having greater genetic distances) BRI 1 and Aokazi, BR3 and
Aokazi, Rayeda and BRJ, Rayeda and BRI l as they are expected to
produce good segregants.
