CHARACTERIZATION AND VARIABILITY ANALYSIS OF EIGHT F 8 LINES OF BORO RICE

Abstract

The investigation was carried out under field conditions to characterize eight F 8

boro rice lines and to study the variability among these lines during the period of boro season (2016-2017) at the experimental field of Sher-e-Bangla Agricultural University, Dhaka. The eight lines of boro rice were characterized for 10 quantitative and 31 qualitative traits for following the release procedure. Variability study was carried out on fifteen parameters to select the best lines for further trial. 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 characteristics variation was observed in- leaf color, penultimate leaf: pubescence of blade, panicle curvature, panicle: exertion, leaf senescence, decorticated grain: shape and decorticated unpolished grain: color. Among the quantitative characteristics- time of heading, stem: culm diameter, days to maturity, grain length, sterile lemma length, decorticated grain length showed difference for all the lines. In case of variability study plant height (cm), spikelets/panicle, filled grains/plant, unfilled grains/plant, yield/plant (g), stem length (cm), days to maturity and yield (t/ha) showed significant result. Minimum days to maturity were observed in L2 (133.66) followed by L8 (134.33), L7 (135.66), L3 (137), L1 (138) and L5 (139) comparing with the checks L9 (141) and L10 (145). Yield/plant (g) was highest for L7 (34.92 g) followed by L2 (33.16g), L3 (32.62g) and L5 (32.4g) comparing with the checks L9 (30.99g) and L10 (31.50g). The highest yield was obtained in L7 (8.79 t/ha), L2 (8.42 t/ha), L3 (8.1 t/ha) and L5 (7.85 t/ha) comparing with the checks L9 (7.69 t/ha) and L10 (7.75 t/ha). So, the most promising lines in respect of yield and time of maturity were L2, L3, L5 and L7 which could be used for further trial in future to follow the release procedure.