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Variability and Heritability Analysis in F4 Genotypes of Brassica Rapa L.

N. JAHAN
Scientific Officer
Bangladesh Agricultural Research Institute (BARI), Gazipur,

M. H. KHAN2
Scientific Officer
Bangladesh Agricultural Research Institute (BARI), Gazipur,

S. GHOSH
Scientific Officer
Bangladesh Agricultural Research Institute (BARI), Gazipur,

S. R. BHUIYAN4 AND
Professor
Dept. of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University (SAU), Dhaka, Bangladesh.

S. HOSSAIN
Professor
Dept. of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University (SAU), Dhaka, Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted in the experimental field of Genetics and Plant Breeding Department, Sher-e Bangla Agricultural University, Dhaka, Bangladesh to study variability in 10 F4 lines obtained through intervarietal crosses along with 8 released varieties of Brassica rapa. Significant variation was observed among all the genotypes for all the characters studied. Considering genetic parameters high genotypic co-efficient of variation (GCV) was observed for number of secondary branches per plant, siliquae per plant, yield per plant, whereas days to maturity showed very low GCV. High heritability with low genetic advance in percent of mean was observed for days to maturity which indicated that non-additive gene effects were involved for the expression of this character and selection for such trait might not be rewarding. High heritability with moderate genetic advance in percent of mean was observed for plant height and days to 50% flowering indicating that this trait was under additive gene control and selection for genetic improvement for this trait would be effective. Considering, inter genotypic variability, heritability, and genetic advance, % coefficient of variation and other agronomic performance G2, G14, G18, G1, G9, G12, G16, G17 may be considered to be better parents for future uses in hybridization programme

Keywords: Variability, Heritability, Brassica rapa L.

Location: Experimental field of Genetics and Plant Breeding Field Laboratory of Sher-e Bangla Agricultural University, Dhaka, Bangladesh

Start Date: 00-11-2007

End Date: 00-03-2008

Program Area: Variety and Species

Commodity: Mustard

Objectives:

This experiment was done to analyze the genetic variability of the genotypes in respect of different morphological characters and to screen out the suitable genotypes for future use.

Methodology:

A field experiment was conducted in the experimental field of Genetics and Plant Breeding Field Laboratory of Sher-e Bangla Agricultural University, Dhaka, Bangladesh during the period from November 2007 to March 2008 to study genetic variability in Brassica rapa. The soil of the experimental area was loamy belonging to the Madhupur Tract under AEZ 28.The soil of the experimental plots were clay loam, land was medium high with medium fertility level. Eighteen genotypes were used in the study. During the rabi season the rainfall generally is scanty and temperature (10.8ºC-30.6ºC) moderate with short day length. Meteorological data on rainfall, temperature, relative humidity from November 2007 to March 2008 were obtained from the Department of Meteorological centre, Dhaka-1207, Bangladesh. The experiment was conducted using ten F4 lines along with their five parental materials and three check varieties. The fertilizers N, P, K, S, and B in the form of Urea (250kg/ha), TSP (170 kg/ha), MoP (85 kg/ha), Gypsum (150 kg/ha), and Borax (60 kg/ha), respectively, were applied. The entire amount of TSP, MP, Gypsum, Zinc sulphate, and borax was applied during the final preparation of land. Urea was applied in two equal installments before sowing and flowering. Field lay out was done after final land preparation. The seeds of parents and F4 materials were laid out in a Randomized Complete Block Design (RCBD) with three replications. The size of the plot was 5m×25m. A distance of 1.5 m from block to block, 30 cm from row to row, and 10 cm from plant to plant was maintained. Seeds were sown in lines in the experimental plots on 11th November 2007 by hand uniformly. The seeds were placed at about 1.5 cm depth in the soil. After sowing, the seeds were covered with soil carefully so that no clods were on the seeds. Seed germination started after 3 days of sowing on 14th November 2007. Treatment was distributed in the operations which were accomplished for better growth and development of the Brassica seedlings. Malathion 57 EC insecticide was applied after one month of seeds sowing at 12 days interval for 3 times with 1 ml in 2.5 liters water for protecting the crop from the attack of aphids and Rovral-50 WP was sprayed @ 20g/10L water first one at the time of siliquae setting of fruiting and second one after 15 days of 1st spraying to control Alternaria leaf spot. No remarkable disease attack was observed. Harvesting was started from 5 February 2008 depending upon the maturity of the plants. When 80% of the plants showed symptoms of maturity i.e; straw colour of siliquae, leaves, stem, and desirable seed colour in the matured siliquae, the crop was assessed to attain maturity. Ten plants were selected at random from each plot in each replication. The sample plants were harvested by uprooting and then they were tagged properly. Data were recorded from these plants. The data were analyzed for different components. Phenotypic and genotypic variance were estimated by the formula used by Johnson et al. (1955). Heritability and genetic advance were measured using the formula given by Singh and Chaudhary (1985) and Allard (1960). Genotypic and phenotypic coefficient of variation were calculated by the formula of Burton (1952). Genotypic and phenotypic variances were estimated according to the formula of Johnson et al. (1955).

Source of Information: Bangladesh J. Agril. Res. 39(2): 227-241, June 2014 ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Considering, inter genotypic variability, heritability, and genetic advance, % co-efficient of variation and other agronomic performance, G2, G14, G18, G1, G9, G12 , G16 and G17 may be considered to be better parents for future uses in hybridization programme.

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