CHARACTERIZATION AND EVALUATION OF TEN ADVANCED BORO RICE LINES

Abstract

An investigation was carried out under the field conditions to characterize and evaluate study ten F 9 advanced boro rice lines during the period of boro season (20182019)

at the experimental field of Sher-e-Bangla Agricultural University, Dhaka 1207. The advanced lines were characterized for 31 qualitative and 10 quantitative traits. Variability study was carried out on 12 parameters to select the best lines for further trial. All the lines were characterized and categorized as per the descriptors developed by Biodiversity International, IRRI and WARDA-2007 for DUS test of inbred rice. Among the qualitative character variation was observed in penultimate leaf pubescence, stigma exertion, attitude of the flag leaf blade, panicle curvature, panicle attitude of branches and panicle exertion. Among all the quantitative character time of heading (50% of plants with heads), stem: culm diameter, panicle length, number of effective tillers per plant, time of maturity, thousand grain weight and decorticated grain length showed difference for all the lines which considered for better agronomic performance. The average days to maturity was 137 days and most of the lines showed early maturity (134 days) and lodging resistance. Most of the lines produced average number of effective tillers per plant (13 tillers), panicle length (25.25 cm) and resulted in higher yield per plant. The average thousand grain weight was 22.88 g and average yield was 8.10 ton/ha. In case of variability study plant height, effective tillers per plant, length of panicle, primary branches per panicle, secondary branches per panicle, total spikelet per panicle, filled grains per panicle, thousand seed weight and yield per ha showed significant variations among the lines. Among the ten lines L5 showed the maximum yield per hectare (9.11 t/ha) and the minimum in L10 (7.08 t/ha). The lines L3 (8.66 t/ha) and L5 (9.11 t/ha) produced higher yield and short duration. Thus, the line L5 would be suitable for developing boro rice variety for its short duration and high yield.