COMPARATIVE STUDY AND CHARACTERIZATION OF 13 F 6 LINES OF BORO RICE

Abstract

The experiments were carried out at the Sher-e-Bangla Agricultural University Farm, Bangladesh during December, 2014- May, 2015. The study was attempted to identify short duration and high yielding rice genotypes amongst 13 F6 lines of Boro rice by comparing with 2 check varieties. The performance of studied genotypes, association among various morpho-physiological, yield contributing and quality contributing traits among the genotypes were evaluated under the field condition and lab condition. The performance of 13 F6 lines compared with 2 check varieties and these were compared considering different yield contributing and quality contributing traits. Considering the traits days to 50% flowering and days to maturity the genotype G11 (BRRI dhan 28 x BRRI dhan 29 F6 S2 P4 P3G9) was earliest which was followed by the genotype G15 (BRRI dhan 28). The highest number of effective tillers per plant was recorded in G12 (BRRI dhan 28 X BRRI dhan 36 F6 S7 P8 P5),highest number of primary branches per panicle was recorded from G4 (BR 21× BRRI dhan 28 F6 S5 P3 P4),the number of filled grains per panicle was recorded highest in G7 (BR 24 × BR 26 F6 S6 P4 P8) and Thousand seed weight was found maximum in G4 (BR 21× BRRI Dhan 28 F6 S5 P3 P4).In the experiment G4(BR 21× BRRI dhan 28 F6 S5 P3 P4)showed maximum length, breadth and L/B ratio of milled rice and maximum protein percent. Except G4(BR 21× BRRI dhan 28 F6 S5 P3 P4) and G10(BR 26 x BRRI dhan 29 F6 S6 P3 P3) all lines showed high amount of amylase percent as like check varieties. The maximum milling and hulling percent were found from G3(BR 21 x BRRI dhan 28 F6 S5 P1 P2).The maximum kernel elongation ratio, kernel elongation index and also maximum cooked rice length and cooked rice L/B ratio and also maximum amount of alkaline spreading value showed by G1(BR 21 x BR 26 F6 S6 P7 P7). Among these 13 F6 lines, G11 (BRRI dhan 28 x BRRI dhan 29 F6 S2 P4 P3) exhibited the early maturity, highest total number of spikelet, higher filled grains than checks, third highest yield per plant which was higher than check varieties and most earliest maturity and had higher hulling (%), milling outturn and higher HRR (%), lowest water absorption (%),GT types intermediate, moderate protein (%) and had high amylose content and G5 was shown moderate maturity, higher number of primary branches, highest number of secondary branches, had maximum yield per plant and also had high amylase content.