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Assessment of Genetic Variation Among Advanced Lines of Brassica Napus L.

Khandker Shazia Afrin
Sher-e-Bangla Agricultural University, Dhaka

Firoz Mahmud
Sher-e-Bangla Agricultural University, Dhaka

Md. Abdur Rahim
Sher-e-Bangla Agricultural University, Dhaka

Md. Shahidur Rahid Bhuiyan
Sher-e-Bangla Agricultural University, Dhaka

Abstract/ Executive Summary:

A field experiment was conducted with 22 Brassica napus L. advanced lines at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka to study the genetic variation among advanced lines of Brassica napus L. during November 2008 to March 2009. The genotypes were significantly different for all the characters studied except for days to 80% maturity. The characters days to 80% maturity, plant height, number of primary branches per plant, number of seeds per siliqua, number of siliqua per plant and seed yield per plant showed higher influence of environment whereas, siliqua length and 1000-seed weight showed the least. Moreover, the number of primary branches per plant, number of secondary branches per plant, siliqua length, number of seeds per siliqua, number of siliqua per plant, 1000-seed weight and seed yield per plant showed moderate broad base heritability while plant height exhibited the highest heritability. The significant positive correlation with seed yield per plant was found in plant height, number of primary branches per plant and number of siliqua per plant. However, the highest significant positive correlation was found between days to 50% flowering and plant height. Path coefficient analysis showed that the plant height had maximum positive direct effect on seed yield followed by number of siliqua per plant and siliqua length. Plant height, number of primary branches per plant and number of siliqua per plant were the most important contributors to seed yield per plant which could be taken into consideration in future hybridization program.

Keywords: Genetic variability, Brassica napus, Correlation coefficient, Path coefficient

Location: Experimental farm of Sher-e-Bangla Agricultural University, Dhaka

Start Date: 12-11-2008

End Date: 20-02-2009

Program Area: Variety and Species

Commodity: Mustard

Objectives:

To study the genetic variation among advanced lines of Brassica napus L.

Methodology:

The seeds of the experimental material were collected from the Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University (SAU) and three released varieties collected from Bangladesh Agricultural Research Institute (BARI). The experiment was laid out in Randomized Complete Block Design (RCBD). The field was divided into three blocks; the blocks were subdivided into 22 plots where genotypes were randomly assigned. The plot size was 3m lengths with 2 rows where row to row and plant to plant distances were 25 cm and 15 cm, respectively. Seeds were sown in lines in the experimental plots on 12 November, 2008. Adequate soil fertility was censured by applying of Urea, TSP, MP, Gypsum and Borax @ 250-170-85-150-5 kg/ha, respectively. Urea was applied by two installments. Total amount of TSP, MP, gypsum and borax along with half of the urea were applied at the time of final land preparation as a basal dose during final land preparation. The second half of the urea was top-dressed at the time of flower initiation. Standard Intercultural operations (such as weeding, thinning, irrigation, pest management, etc.) were done uniformly in all the plots to ensure proper growth condition for the crop. Harvesting was started from February 20, 2009 depending upon the maturity. Observations were recorded on 10 randomly chosen plants from each plot. Data were collected on days to 50% flowering, days to 80% maturity, plant height (cm), number of primary branches per plant, number of secondary branches per plant, siliqua length (cm), number of siliqua per plant, number of seeds per siliqua, 1000 seeds weight (g) and seed yield per plant (g). Data were subjected to analysis and genotypic and phenotypic coefficient of variations; heritability and genetic advance were estimated. Genotypic and phenotypic correlation coefficients were calculated and path coefficient analysis was done according to method.

Source of Information: Agronomsnik Glasnik, 4-5, 2011, ISSN 0002-1954

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The genotypic residual effect was 0.350 which indicated that there were other responsible traits for contribution to seed yield per plant that were not taken into consideration in the present study. The path coefficient studies indicated that plant height, number of primary branches per plant and number of siliqua per plant were the most important contributors to seed yield per plant which could be taken into consideration in future hybridization programs

Knowledge Management: Journal