CHARACTERIZATION AND VARIABILITY ANALYSIS OF SEVERAL ADVANCED LINES OF BORO RICE (Oryza sativa L.)

Abstract

The investigation was carried out under field conditions to characterize thirteen advanced lines of boro rice and to study their variability among these lines during the period of boro season (20182019)

at the experimental field of Sher-e-Bangla Agricultural University, Dhaka. The Thirteen advanced lines were categorized for twenty qualitative and ten quantitative traits for following the release procedure. Variability study was carried out on twelve parameters to select the best lines for further trail. The lines were characterized and categorized as per the descriptors developed by Biodiversity International, IRRI and WARDA-2007 for DUS test of inbred rice. All the lines showed variation for twelve qualitative characters. They are green color intensity of leaf blade, flag leaf: attitude of the blade, lemma and palea: anthocyanin coloration, spikelet: color of the tip of lemma, panicle exertion, panicle: awns in the spikelet, attitude of branches culm habit, color of the stigma, ligule color, panicle exertion, leaf senescence, color of awns. Among the quantitative characteristics, culm length (cm), panicle length (cm), culm diameter, time of heading (50 % of the plants with head), effective tillers per hill, thousand seed weight (g), days to maturity, grain length (mm), grain width (mm) and yield per square meter(g) showed variation among the rice lines. In case of variability analysis ten parameters showed significant result viz. plant height (cm), no. of effective tillers per hill, panicle length (cm), number of secondary branches per panicle, number of filled grains per panicle, number of unfilled grains per panicle, thousand seed weight (g), days of 80 % maturity, yield per square meter (g) and yield per ha (t). Two parameters showed non-significant result viz. primary branch per panicle and grain length (mm). Minimum days to maturity were observed in G10 (130.56) followed by G11 (133.78), G07 (134.44), G05 (138.22) compared with the checks G14 (144.56) and G15 (140.56). Yield per ha (t) was highest in G01 (9.91 t/ha) followed by G13 (9.38 t/ha) compared with the checks G14 (9.5 t/ha) and G15 (9.22 t/ha). So, the most promising lines in respect of yield and time of maturity were G01, G10, G11 and G13 which could be used for further trail in future to follow the release procedure.