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Articles by Umakanta Sarker
Total Records ( 2 ) for Umakanta Sarker
  Umakanta Sarker , P. S. Biswas , B. Prasad and M. A. Khaleque Mian
  Two line x 13 tester mating design along with 15 rice genotypes and their 26 F1s were used to study the heterosis as well as combining ability of yield and 7 yield contributing characters. Highly significant genotypic differences were observed. The SCA variances were found highly significant while GCA variances were insignificant for all the characters. The highest heterosis (100.70%) was observed in cross IR62829A x IR44675R followed by other 17 crosses for yield and most of its related traits. The contribution of testers was observed to be higher than that of the interactions of line x tester except panicle weight that revealed the higher estimates of GCA variance I. e., additive gene action among the testers used. Except panicle weight, mean performance of parents for all the traits were strongly and positively correlated with GCA effects. Within CMS parents, IR62829A was found to be good general combiner for most of the traits. Among male parents, BR827R, IR44675R, IR55838R, IR21567R and IR50404R were observed to be good general combiners for most of the characters studied. The cross combinations IR62829A x IR44675R, IR58025A x IR46R, IR58025A x BR736R, IR58025A x IR50404R, IR58025A x IR32809R, IR58025A x AjayaR, IR58025A x IR55838R and IR62829A x IR21567R were observed to be good specific cross combinations for grain yield and most of other 7 yield related traits due to highly significant SCA and heterotic effects. In several cases, cross between high x high general combiner did not produce good specific cross. Rather good specific crosses were obtained from high x high, high x low, low x high and low x low general combiner indicating predominance of non-additive gene action.
  Umakanta Sarker and Nilufa Ferdous
  Genotype x environment interaction for plant height (cm), days to maturity and grain yield (t/ha) in HYV boro rice were studied by growing six genotypes over three different environments (seedling age of 45, 60 and 90 days old). Highly significant genotypes and G x E interaction were observed for all the traits. Highly significant environments were observed for days to maturity and grain yield. Both non-linear component (pooled deviation) and linear components (seedling age) were found highly significant for grain yield and days to maturity but non-significant for plant height and grains protein content (%). BRRI dhan29 and BRRI dhan28 were found to be stable for yield and its components over all seedling age. On the other hand, except BR3, all the varieties showed stability for grain protein content (%) over environments. BRRI dhan29 was observed to be the top yielding crop followed by BRRI dhan28. BR26 and BR24 were found to be suitable for favourable and poor environments, respectively. Sixty days old seedlings might be transplanted followed by 45 days old seedlings for higher grain yield for above varieties.
 
 
 
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