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Variability and Heritability Analysis in Short Duration and High Yielding Brassica Rapa L.

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

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

M. H. RASHID
Senior Scientific Officer
Bangladesh Agricultural Research Institute (BARI)

S. GHOSH
Chief Scientific officer and head
Bangladesh Agricultural Research Institute (BARI)

S. K. PAUL
Scientific Officer
Bangladesh Agricultural Research Institute (BARI),

Abstract/ Executive Summary:

The experiment was carried out with 32 genotypes of Brassica rapa including two commercially cultivated varieties as checks to study their inter-genotypic variability, heritability, GCV, PCV, genetic advance, and CV percent considering 10 morphological characters at the experimental farm of SAU, Dhaka during November 2009 to February 2010. Significant variation was observed among the genotypes for all the characters studied except thousand seed weight. High GCV and PCV values were observed for number of secondary branches/plant. High heritability values along with low genetic advance in percentage of mean were obtained for 1000-seed weight, number of secondary branches/plant, seeds/siliquae, and siliquae length. Highly significant positive association of seed yield per plant was observed with number of primary branches/plant, number of secondary branches/plant and number of siliquae/plant. Considering variability among the genotypes, heritability, genetic advance, percent co-efficient of variance, and field performances, the genotypes G-15, G-19, G-1, G-3, G-4, G-10, G-18, G21, and G-24 were found suitable for future breeding programme.

Keywords: Variability, Heritability, Brassica rapa L.

Location: Bangladesh Agricultural Research Institute (BARI)

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Mustard

Objectives:

The present study was conducted to find out the variability, character association and the direct and indirect effects of different characters on yield per plant which will give an opportunity to select the desired plant types to meet the existing demand.

Methodology:

The present experiment was conducted at the experimental farm of Sher-eBangla Agricultural University (SAU), Dhaka-1207 during November 2009 to February 2010. A total number of 32 materials were used in this experiment where two were parents and 30 were F7 segregating lines (Table 2). The crop was fertilized at the rate of 10 tons of cowdung, 250 kg urea, 175 kg triple super phosphate (TSP), 85 kg muriate of potash (MoP), 250 kg gypsum, 3 kg zinc oxide, and 1 kg boron per hectare. The half amount of urea and total amount of cowdung, TSP, MoP, gypsum, zinc oxide, and Boron were applied during final land preparation. The rest amount of urea was applied as top dressing after 25 days of sowing. The experiment was laid out in randomized complete block design (RCBD) with three replications. The total area of the experiment was 37m × 11m = 407 m² . Each replication size was 37 m × 2.7 m and the distance between replication to replication was 1 m. The spacing between line to line was 30 cm. Seeds were sown in lines in the experimental plots on 4 November 2009. The seeds were placed at about 1.5 cm depth in the soil. Intercultural operations, such as weeding, thinning, irrigation, pest management, etc. were done uniformly in all the plots as and when necessary. Aphid infection was found in the crop during the siliquae development stage. To control aphids, Malathion-57 EC @ 2ml/liter of water was applied. Harvesting was done from 4th to 15th February 2010 depending upon the maturity of the genotypes. For studying different genetic parameters and inter-relationships, 10 characters were taken into consideration. The data were recorded on randomly 10 selected plants for each of the parental lines and F8 progenies on the following traits- days to 50% flowering, days to 80% maturity, plant height (cm), number of primary branches/plant, number of secondary branches/plant, number of siliquae/plant, siliquae length (cm), number of seeds/siliquae, 1000-seed weight (g), and seed yield/plant (g). The data were analyzed for phenotypic and genotypic variances Johnson et al. (1955). Heritability and genetic advance were measured using the formulae given by Singh and Chaudhary (1985) and Allard (1960). Genetic advance in percentage of mean were calculated as suggested by Johnson et al. (1955).

Source of Information: Bangladesh J. Agril. Res. 38(4): 647-657, December 2013 ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

High GCV and PCV values were observed for number of secondary branches/plant. High heritability values along with low genetic advance in percentage of mean were obtained for 1000-seed weight, number of secondary branches/plant, seeds/siliquae, and siliquae length. Considering variability among the genotypes, heritability, genetic advance, percent co-efficient of variance, and field performances, the genotypes G-15, G-19, G-1, G-3, G-4, G-10, G-18, G21, and G-24 were found suitable for future breeding programme.

Knowledge Management: Journal