PHENOTYPIC EXPRESSION OF DIFFERENT TRAITS AGAINST THE PREVALANCE OF MAJOR DISEASES IN FINE RICE

Abstract

An experiment was carried out at the experimental field of Department of Genetics and Plant Breeding, Hajee Mohammad Danesh Science and Technology University, Dinajpur, during the period from July to December 2008 to study the phenotypic expression of different traits against the prevalence of major diseases in fine rice. The experiment was laid out in a Randomized Complete Block Design with three replications provided 7 genotypes of fine rice. The results of the investigation revealed that significant variation were found among the genotypes for the characters tillers per hill and 1000- grain weight (g). On the other hand, variation was observed both for genotype and environment against effective tillers per hill, spikelets per panicle and sterility percentage (“%).High co-heritability was estimated in 1000-grain weight and number of affected tillers by brown spot per hill with yield. Number of affected tillers by brown spot per hill was highly environmentally influenced character. On the contrary, percent of affected tillers by sheath blight per hill was less influenced by environment. Effective tillers/hill, panicle length, spikelets/panicle and 1000-grain weight showed significant and positive correlation with yield. Selection would be effective for increasing grain yield for the characters plant height, effective tillers per hill, spikelets per panicle and panicle length. Ranzit and Zira were showed high degree of disease resistance against brown spot, bacterial leaf blight and sheath blight. Varieties seemed to be easy to improve were Katari, Badshabhog and Sanla. The highest yield was obtained in Ranzit (4.603 t/ha).