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Genetic Variability, Character Association and Path Analysis in Brassica Rapa L. Genotypes

S. Naznin
Scientific Officer
Plant Breeding, Tuber Crops Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

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

S. Sultana
Scientific officer
Plant Breeding, Tuber Crops Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

M. A. Kawochar
Scientific officer
Plant Breeding, Tuber Crops Research Centre, Bangladesh Agricultural Research Institute, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Thirty three genotypes of Brassica rapa L. were evaluated in order to find out their inter-genotypic variability; character association and path coefficient of seed yield/plant and its component characters. BARl sarisha-6 x TORI-7 S-45 showed best result in terms of early maturity (75 days) and higher seed yield/plant (5.28g) than check varieties. The character, plant height, was highly influenced by the environment whereas, all other characters influenced the least. Number of secondary branches/plant showed the highest phenotypic and genotypic coefficient of variation. Moreover, number of siliquae/plant, number of secondary branches/plant and number of primary branches/plant showed high heritability (93.16%, 75.69% and 68.03%, respectively) couple with high genetic advance in percent of mean (37.74%, 73.55% and 26.82%, successively). The seed yield/plant showed significant positive correlation with number of siliquae/plant (rg = 0.7011**, rp = 0.5684**), number of primary branches/plant (rg = 0.5611**, rp = 0.4016*) and number of secondary branches/plant (rg = 0.5160**, rp = 0.4098*) revealing that selection based on these traits would be judicious. Path analysis showed that the number of siliquae/plant (0.4679), number of primary branches/plant (0.2823) and number of secondary branches/plant (0.0092) were the most important contributors to seed yield/plant. The results indicated that number of siliquae/plant, number of primary branches/plant and number of secondary branches/plant can be used as selection criteria to increase seed yield/plant in rapeseed.

Keywords: Genetic variability, Heritability, Character association, Path analysis, Brassica rapa L.

Location: Sher-e-Bangla Agricultural University farm, Dhaka.

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Variety and Species

Commodity: Mustard

Objectives:

To find out the variability, character association and the direct and indirect effect of different characters on yield

Methodology:

Thirty-three Brassica rapa L. genotypes were used in this experiment where three of them were used as check. Among the genotypes, thirty were selected from F₉ segregating generation on the basis of their variation in different traits. The experiment was laid out in Randomized Complete Block Design with three replications at the field of Sher-e-Bangla Agricultural University farm, Dhaka, during rabi, 2011-2012. Each plot was 3 m long with two rows. Distance between row- row 30 cm and plant-plant 10 cm and block-block I m were maintained. Recommended doses of fertilizers and standard cultural practices were applied for raising healthy crops. Data were recorded on days to maturity, plant height (cm), number of primary branches/plant, number of secondary branches/plant, number of siliquae/plant, siliqua length (em), number of seeds/siliqua, 1000 seed weight (g) and seed yield/plant (g). All the collected data of the study were used to statistical analysis. Analysis of variance (ANOVA), mean, range were calculated by using MSTATC software program and then phenotypic and genotypic variance was estimated. Genotypic and phenotypic co-efficient of variation were calculated and values were categorized as low (0-10%), moderate (10-20%) and high (20% and above) as suggested.

Source of Information: Bangladesh J. Agril. Res. 40(2): 305-323, June 2015, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The result of the study will provide the ability of breeders to develop desirable plant types having high yield with early maturity. Analyzed value from genotypic and phenotypic coefficient of variation, heritability and genetic advance in percent of mean, correlation co-efficient and even path coefficient, number of siliquae/plant, number of primary branches/plant and number of secondary branches/plant were the such traits which could be considered for future hybridization program.

Knowledge Management: Journal