CHARECTERIZATION AND VARIABILITY ANALYSIS OF SOME ADVANCED LINES OF FINE GRAIN BORO RICE (Oryza sativa L.)

Abstract

The experiment was conducted to characterize some advanced lines of fine grain boro rice and to determine the variability among these lines during the period of boro season (2018-2019) at the experimental field of Sher-e-Bangla Agricultural University, Dhaka. These advanced lines of fine grain boro rice were characterized for 15 quantitative and 17 qualitative traits. Variability study was carried out on 15 parameters to select the best lines for further trial. Among the qualitative characteristics, variation was observed in leaf color, leaf sheath: anthocyanin color, flag leaf: attitude of the blade, lemma and palea: anthocyanin color, stem: anthocyanin coloration of internodes, spikelet: color of the tip of lemma, panicle: awns in the spikelet, panicle exertion, grain color and culm habit. Among the quantitative characteristics- time of heading, stem: culm diameter, days to maturity, grain length, decorticated grain length showed difference for all the lines. In case of variability study all the characters showed significant result. Phenotypic variance was higher than the genotypic variance for all the characters indicating environmental effect presence on these characters. High phenotypic and genotypic coefficient of variation was found in unfilled grain/plant and days to 80% maturity. High heritability coupled with high genetic advance and genetic advance in percentage of mean was found in primary branch/panicle, spikelet/panicle, filled grain/plant and unfilled grain/plant which indicated that additive gene expression on this character. Character association analysis indicating that yield/plant had highest significant positive correlation with thousand seed weight (g) in both genotypic and phenotypic level indicating the importance of these trait in selection for increasing yield. Most of the lines showed higher no. of effective tillers, long panicles with higher no. of grains/panicle which would be the agronomic superiority. The average panicle length was 24.83 cm and mean total no. grain was 179.31 per panicle which contributed to an average yield of 36.97 g per plant. Five lines viz. L1, L2, L3, L6 and L7 showed extra-long fine rice grain character. The highest yield was observed in L10 (7.70 t/ha), L8 (7.50 t/ha) and L5 (7.40 t/ha) comparing with the check varieties. So, the best lines viz. L5, L8 and L10 which could be used for further trial in future to follow the release procedure in respect of time and yield.