CHARACTERIZATION OF ADVANCED LINES OF BORO RICE (Oryza sativa L.)

Abstract

The investigation was carried out under field conditions to characterize nine genotypes of advanced lines of Boro rice during the period of Boro season (2015- 2016) at the experimental field of Sher-e-Bangla Agricultural University, Dhaka. These nine advanced lines of Boro rice were characterized for 15 qualitative and 20 quantitative traits. All the genotypes were characterized and categorized as per the descriptors developed by Bioversity International, IRRI and WARDA. Among the qualitative characteristics no variation was observed in case of basal leaf sheath color, leaf blade pubescence, ligule shape, culm habit and caryopsis scent and all the genotypes were green, pubescent, 2-cleft type, lodging resistant and non-scented respectively. Only two types of ligule and auricle color viz. whitish and yellowish green were found. Among the nine genotypes, five genotypes viz. G01, G02, G07, G08 and G09 were found having well exerted type panicle. Only two genotypes had awns specifically G02 showed partly awned and G06 showed fully awned character. Among the quantitative characteristics no variation was observed in case of seedling height (30DAS), flag leaf width, leaf senescence and branching of panicle and all the genotypes were short with broad type flag leaf showing late and slow leaf senescence and clustered type panicle. Most of the genotypes showed higher no. of effective tillers, long panicles with higher no. of grains per panicle which would be the agronomic superiority. The average panicle length was 27.59 cm and mean total no. of grain was 218.80 per panicle which contributed to an average yield of 31.35 g per plant. Three genotypes viz. G03, G04 and G05 showed extra long fine rice grain character. All the genotypes except G07 were very high yielding and for maturing time they were late to very late type rice genotypes.