Abstract:
Rice is a staple food in terms of acreage and production in Bangladesh. The assessment of genetic variability in
rice genotypes is essential to identify suitable characters for its further improvement. An experiment was carried
out to study the morpho-physiological and genetic characteristics of transplanted Aman (one of the important rice
growing seasons in Bangladesh) rice cultivars. Ten Aman rice varieties were tested as treatments and the
experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. The analysis of
morpho-physiological traits in tested rice varieties demonstrated that the higher number of effective tillers per
hill, panicle length, grains per panicle and 1000 grain weight was the most yield contributing traits those were
influenced to produce higher grain yield. In terms of genetic traits analyses, all the studied traits exhibited high
heritability (>60%) except panicle length. And in correlation studies, grain yield showed the significant positive
correlation with 1000 seed weight, panicle length, effective tiller number per hill along with biological yield, straw
yield and harvest index. Moreover, path coefficient analysis revealed that biological yield and harvest index
showed a high and positive direct effect on grain yield. Thus, after studying different traits among ten varieties of
Aman rice there after considering the three categories, hybrid varieties performed better followed by HYV
compared to traditional rice varieties. And the Dhanigold variety might be recommended as a higher yield
producing cultivar along with the economic return.
