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Variability and Interrelationship Among Yield and Yield Contributing Characters in Onion (allium Cepa L.)

M S Hossain
Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi-6205, Bangladesh.

M Khalekuzzaman
Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi-6205, Bangladesh.

M H Rashid
Institute of Biological Sciences, University of Rajshahi, Rajshahi-6205, Bangladesh.

M S Rahman
Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi-6205, Bangladesh.

Abstract/ Executive Summary:

On yield and yield components in order to obtain information on genetic variability and character association of onion. Higher genotypic coefficients of variations were recorded in number of seeds per scape (NSPS), final plant height (FPH), final scape height , fresh weight of bulb and bulb length. These characters also exhibited high heritability along with high genetic advance as percentage of mean. Phenotypic correlation coefficients showed that bulb length, bulb diameter and scape diameter were positively and significantly correlated with fresh weight of bulb. The number of seeds per scape, final scape height, final plant height and number of pseudostem branches at maximum flowering stage were also positively and significantly correlated with seed yield per scape.

Keywords: Genetic variations, Correlation, Yield components, Onion.

Location: Experimental field of Academic Unit, Faculty of Agriculture, University of Rajshahi, Bangladesh

Start Date: 00-11-2005

End Date: 00-04-2006

Program Area: Variety and Species

Commodity: Onion

Objectives:

The present research work was undertaken to study the genetic and nongenetic variability and nature of interrelationship among yield and other yield contributing characters, which will be helpful in future breeding programme for the improvement of this crop.

Methodology:

A total of seven onion varieties, viz., Taherpuri brown, Taherpuri white, Pusa red, Pusa white, Patnaideep pink, Shitlai brown and Shamrat collected from Bangladesh Agricultural Research Institute, Joydebpur Gazipur were used in this study. The bulbs of the variety were used as the planting materials. The experiment was laid out in Randomized Complete Block Design with three replications at the experimental field of Academic Unit, Faculty of Agriculture, University of Rajshahi, Bangladesh during November, 2005 to April, 2006. The unit plot size was 3m × 1m having 35 cm distance from row to row, 45 cm distance from plotto plot and 50 cm distance from replication to replication. The medium sized mother bulbs were planted in each row of the plots on 17th November, 2005. Manure and fertilizers were applied at the rate of cowdung 0.5 tone, Urea 120 kg, TSP 130 kg and MP 160 kg/ha. The entire amount of cowdung, TSP, MP and 50% of Urea were applied at final land preparation. The rest 50% Urea was applied as top dressed after 40 days of planting the bulbs. Normal cultural practices were followed as routine procedure to ensure normal growth of plants. Data on days to flower initiation (DFI) was recorded as plot basis, while other various characters viz., number of leaves at maximum flowering stage (NLMFS), number of pseudostem branches at maximum flowering stage (NPMFS), final plant height (FPH) in cm, final scape height (FSH) in cm, number of flowers per scape (NFPS), number of scape per plant (NSPP), number of seeds per scape (NSPS), scape diameter (SD) in cm, fresh weight of bulb (FWB) in gm, bulb length (BL) in cm, bulb diameter (BD) in cm and seed yield per scape (SYPS) in mg were recorded from randomly selected 10 sample plants from each plot. Phenotypic and genotypic variances were estimated by using the formula given by Johnson et al. (1955). Phenotypic and genotypic coefficient of variability was estimated according to the formula given by Burton (1952). Heritability in broad sense was estimated according to Hanson et al. (1956). The genetic advance as percentage of mean and phenotypic correlation coefficients was computed using the formula suggested by Comstock and Robinson (1952) and Al-Jibouri et al. (1958) respectively.

Source of Information: J. bio-sci. 16: 85-88, 2008 ISSN 1023-8654

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Correlation coefficients revealed that BL, BD and SD are important as they exhibited significant positive correlation with FWB, which indicated that increase of the values of these characters will increase FWB. Again, number of NSPP, NSPP, FSH, FPH and NPMFS also exhibited positive correlation with SYPS suggesting increase of these traits would increase seed SYPS. Among these traits, BL, FWB, FSH, NSPS and FPH had high genotypic coefficients of variations and high heritability coupled with high genetic advance as percentage of mean which suggested that selection based on these characters would give better response for improving bulb yield as well as seed yield in onion.

Knowledge Management: Journal