GENETIC STUDY ON YIELD AND QUALITY TRAITS OF ADVANCED BREEDING POPULATIONS IN Brassica rapa L.

Abstract

The experiment was conducted with 13 advanced breeding populations of Brassica rapa L. during rabi season from November 2017 to February 2018 in research farm of Sher-e-Bangla Agricultural University to evaluate morphological and biochemical traits of the selected populations. The analysis of variance showed significant variation in all the traits. High genotypic and phenotypic coefficient of variation was observed for the characters viz; number of secondary branches per plant, number of siliquae per plant and yield per plant. High heritability coupled with high genetic advance in percent of mean was found for days to 50% flowering, number of secondary branches per plant, siliqua per plant, number of seeds per siliqua and yield per plant. The correlation studies revealed that yield per plant had highly significant positive relation with number of primary branches per plant, secondary branches per plant and number of siliquae per plant at both genotypic and phenotypic level. Path analysis showed that siliquae per plant had highly significant and positive direct effect on the yield per plant. Biochemical analysis of various fatty acids of five populations was done. Among the populations lowest amount of palmitic, stearic and erucic acid was found in P7 (Tori-7 x BARI sarisha-15 F 6 ) (1.68%), P9 (BARI sarisha-9 X BARI sarisha-6 S 5 ) (0.49%) and P12 (SAU sarisha-1 X BARI sarisha-15 F 6 ) (54.08%) respectively. The highest amount of oleic, linoleic and linolenic acid was found in P12 (15.16%), P13 (BARI sarisha-6 X BARI sarisha-15 F 9 ) (14.27%) and P13 (8.65%) respectively. In case of short duration P1 (SAU sarisha-2 X BARI sarisha-15 F 7 ) (78.00 days) showed the best result. Higher yield per plant was found in P1 (7.31 g), P9 (6.53 g) and P12 (5.40 g) chronologically. Among the populations P1 was found as the best on the basis of days to 80% maturity, number of secondary branches per plant, number of siliquae per plant and yield per plant. Based on biochemical analysis for saturated fatty acids populations P7 and P9 were good. For unsaturated fatty acids population P12 was better enough than other populations. By comparing, it might be concluded that populations P1, P7, P9 and P12 had potential for improvement based on yield contributing traits and fatty acid content.

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