CHARACTERIZATION AND VARIABILITY STUDY OF SOME ADVANCED BORO LINES

Abstract

The investigation was carried out under the field conditions to characterize and variability study among the ten F 8 advanced boro rice lines and two checks (BRRI dhan 28 and BRRI dhan 29) during the period of boro season (2016-2017) at the experimental field of Sher-e-Bangla Agricultural University, Dhaka1207.The ten advanced lines of boro rice and two checks were characterized for

31qualitative

and 10 quantitative traits as a part of the release procedure. Variability study are carried out on twelve 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 characters 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 characters 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 136 days and most of the lines resulted in early maturity and lodging resistance. Most of the lines showed average number of effective tillers per plant was 12 tillers and panicle length was 22.74 cm resulted in higher yield per plant. The average thousand grain weight was 24.71 gm and average yield was 8.69 ton/ha. In case of variability study plant height, number of effective tillers, length of panicle, number of primary branches per panicle, number of secondary branches per panicle, total spikelet/panicle, no. filled grains per panicle, thousand seed weight and yield/ha showed significant variations among the lines. Comparing with the check varieties L11 (BRRI dhan 28) (8.45 t/ha) and L12 (BRRI dhan 29) (8.37 t/ha), the lines L2 (8.97 t/ha), L3 (8.79 t/ha), L4 (9.43 t/ha), L5 (9.27 t/ha), L8 (9.19 t/ha), L9 (9.61 t/ha) showed the higher yield and short duration. Thus the lines L2, L3, L4, L5, L8 and L9 would be suitable for released as high yielding boro rice variety for their short duration and high yielding characters.