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Variability and Correlation Study of Some Advanced Lines of Brassica Rapa

T. Halder
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka-1207

M. S. R. Bhuiyan
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka-1207

M. S. Islam
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka-1207

Abstract/ Executive Summary:

Variability, heritability, genetic advance and correlation were assessed in eleven advanced lines of Brassica rapa obtained through inter-varietal crosses along with three popular check varieties at the experimental field of Sher-e-Bangla Agricultural University. Significant variations were found in yield per hectare and all the yield components that were taken under the study. Highest yield per hectare (2111.33 kg) was found in SAUSR 14 (TORI-7×BARI Sarisha-9). The advanced line SAUSR 08 (BARI Sarisha-6×TORI-7) matured early (83.67 days) and produced moderate yield (1662.00 kg). It could be assumed from the mean performance that SAUSR 14 and SAUSR 08 showed better performance over the popular check varieties in respect of yield and maturity. Highest GCV (20.06%) and PCV (31.71%) were observed in number of siliquae per plant. Genotypic variance was lower than phenotypic variance for all characters except yield per hectare. High heritability in broad sense (91.14% and 79.25%) was observed for days to 50% flowering and days to 80% flowering. Highest genetic advance (36.56%) was found for number of siliquae per plant. Low heritability (29.27%) with high genetic advance (23.14%) was observed for yield per hectare. Highly positive significant phenotypic correlation with yield per hectare was seen in days to 80% maturity and number of secondary branches per plant. Days to 50% flowering and siliquae length showed negative highly significant phenotypic correlation with the yield per hectare.

Keywords: Variability; Heritability; Genetic advance; Phenotypic correlation intervarietal crosses; Advanced lines

Location: Experimental farm of the Department of the Genetics and Plant Breeding, Sher-e-Bangla Agricultural University

Start Date: 00-11-2013

End Date: 00-02-2014

Program Area: Variety and Species

Commodity: Mustard

Objectives:

The present experiment was conducted by utilizing fourteen Brassica rapa genotypes (eleven advanced breeding lines including three popular check varieties) to study variability, heritability, genetic advance and correlation to select promising genotypes.

Methodology:

The experiment was conducted at the experimental farm of the Department of the Genetics and Plant Breeding, Sher-e-Bangla Agricultural University during November 2013 to February 2014. Fourteen genotypes including eleven advanced lines that were obtained from various inter-varietal crosses of six and more than six generations and three check varieties (BARI Sarisha-14, BARI Sarisha-15 and TORI-7) were used as experimental materials. Randomized Complete Block Design (RCBD) was used with 3 replications of the material. Each plot consisted of single row of 3m length with 30 cm spacing between the rows and 10 cm between the plants. Cowdung was used 13 t ha-1 while Urea: Triple Super Phosphate (TSP): Muriate of Potash (MP): Gypsum: Zinc Sulphate: Boric Acid was applied as 251:184:85:152:3:13 kg ha^-1. The cowdung was applied before the chemical fertilizer applications. The TSP, MP, Gypsum, Zinc Sulphate, Boric Acid and 50% Urea were used as basal dose and the rest 50% Urea was used as top dressing at the flower initiation stage. First weeding and thinning was done at 15 DAS (Days after Sowing) and top dressing, second weeding and thinning was done at 25 DAS. Ten plants of each genotypes of each replication were taken for data collection. Data was recorded on days to first flowering, days to 50% flowering, days to 80% flowering, days to maturity, plant height (cm), number of primary branches per plant, number of secondary branches per plant, number of siliquae per plant, length of silique (cm), number of seeds per siliquae, yield per hectare (kg) and thousand seed weight (g). Mean data of the yield contributing characters were used for statistical analysis. Least Significant Difference (LSD) test was done according to Gomez and Gomez, 1984. Genotypic and phenotypic variance was estimated according to the formula of Johnson et al., 1995. Heritability and genetic advance was measured by using the formula given by Singh and Chaudhary, 1985 and Allard, 1960. All statistical analysis was accomplished by MSTAT and GENSTAT, computer based software.

Source of Information: Bangladesh J. Pl. Breed. Genet., 27(1): 25-36, 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Positive significant correlation with yield per hectare was observed in days to 80% flowering, number of primary branches per plant, number of secondary branches per plant and number of seeds per siliquae. The results revealed that direct selection of these character would be effective to increase yield of the advanced lines. For betterment of yield, selection of the characters that showed significant positive association with yield per hectare would be useful.

Knowledge Management: Journal