VARIABILITY, CHARACTER ASSOCIATION AND STUDY OF QUALITY CHARACTERISTICS OF 10 F9 AUS RICE LINES

Abstract

The present research work was conducted at the central farm, Sher-e-Bangla Agricultural University (SAU), Dhaka during March, 2018- August, 2018 to evaluate the variability, character association and to study of quality characteristics of 10 F9 Aus rice lines. Ten rice genotypes viz. L1= BRRI dhan29× BRRI dhan36, S 2 P 2 P 4 S 6 iii

, L2= BRRI dhan29× BRRI dhan36, S 5 , L3= BRRI dhan28× BRRI dhan29, S 2 P 4 P 3 S 3 , 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 experiment was designed in a randomized complete block design (RCBD) with three replications. All data were analyzed by one-way analysis of variance (ANOVA) using MSTAT-C. The maximum number of effective tillers per plant (20.80) was recorded from L7 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 (21.77 cm) was recorded from L2. The highest number of filled spikelets per panicle (119.90) was recorded from L7 while the lowest number of unfilled spikelets per panicle was recorded in L7 (18.93). The highest grain yield (3.83

and 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 . The maximum hulling, milling and head rice recovery (26.5 %, 66.67 % and 61.67%) was recorded from L7. The highest kernel length, breadth length/breadth and uncooked rice was observed in L7 (5.93, 2.33 and 2.55, respectively). The highest kernel length, breadth and ration of cooked rice (8.19 mm, 3.17 mm and 2.58) was recorded from L7. The highest kernel elongation ratio and index (1.38 and 1.02) were recorded from L7. The maximum volume expansion (28.04 %), the highest alkaline spreading value (4.33), the highest protein (8.40 %) and the lowest and the lowest amylose (23.93 %) were in 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