CHARACTERIZATION AND VARIABILITY STUDY AMONG 10 F9 AUS LINES

Abstract

The present research work was conducted at the farm, Sher-e-Bangla Agricultural University (SAU), Dhaka during March, 2018- August, 2018 to characterization and variability study among 10 F9 Aus lines. Ten rice genotypes viz. L1= BRRI dhan29× BRRI dhan36, S 2 P 2 P 4 S 6 , L2= BRRI dhan29× BRRI dhan36, S 5 P 2 P 4 S 6 , L3= BRRI dhan28×BRRI dhan29, S 2 , L4= BRRI dhan28×BRRI dhan29, S 2 P 4 P 3 S 2 , L5= BRRI dhan29×BRRI dhan36, S 5 P 2 P 4 S 5 , L6=BRRI dhan26×BRRI dhan28, S 1 P 9 P 4 S 1 , L7= BR 21×BRRI dhan29, S 2 P 1 S 1 , L8= BR 21×BRRI dhan29, S 6 P 1 P 1 S 2 , L9=BR 21×BRRI dhan29, S 6 P 1 P 1 S 1 , L10= BR 24×BRRI dhan36, S 8 P 1 P 1 S 1 were used for this present study. The experiments were designed in a randomized complete block design (RCBD) with three replications. All data were analyzed by one-way analysis of variance (ANOVA) using MSTATC. Differences were found in the genotypes studied characteristics viz. penultimate leaf pubescence, penultimate leaf: shape of the ligule, flag leaf: attitude of the blade, time of heading (50% of plants with heads), time of maturity, grain length, decorticated grain length and polished grain: size of white core or chalkiness (% of kernel area) and rest of the characters found no variation. Seven lines (L3, L4, L5, L6, L7, L8, L10) showed long grain length and rest three lines (L1, L2, L9) showed very long category of grain length. Medium type of decorticated grain length were found in six lines (L3, L4, L6, L7, L8, L10) and rest four lines (L1, L2, L5, L9) found long type of grain length after dehulling. Six lines (L3, L4, L6, L7, L8, L10) were represented small and four lines (L1, L2, L5, L9) were showed medium size of white core of polished grain. The maximum number of ineffective tillers per plant (15.80) was recorded from L2 and the minimum number of ineffective tillers per plant (0.37) was recorded from L7. The highest panicle length (24.90 cm) was recorded from L7 and the lowest panicle length (22.17 cm) was recorded from L2. The highest number of filled spikelets per panicle (119.90) was recorded from L7 while the highest number of unfilled spikelets per panicle was recorded in L2 (88.93). The highest grain yield (3.83and 5.25 t ha -1 ) was recorded from L7 and the lowest grain yield (1.19 and 3.23 t ha -1 ) was observed in L2. The highest harvest index (43.10 %) was recorded from L7. Line L7 (BR 21× BRRI dhan29, S 2 P 1 S 1 )was better cultivar in terms of quality, yield and yield contributing characters.