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Genetic Variability, Correlation and Path Co-efficient Analysis in Bottle Gourd (lagenaria Siceraria L.)

A. Husna
Horticulture Development Centre, Bangladesh Agricultural Development Corporation, Bangladesh

F. Mahmud
Horticulture Development Centre, Bangladesh Agricultural Development Corporation, Bangladesh

M.R. Islam
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

M.A.A. Mahmud
Department of Agricultural Extension, Bagatipara, Natore, Bangladesh

M. Ratna
Spices Research Sub-Centre, Bangladesh Agricultural Research Institute, Faridpur, Bangladesh

Abstract/ Executive Summary:

Variability, correlation and path analysis among different characters of thirty one bottle gourd genotypes were studied. There was a great deal of significant variation for all the characters among the genotypes. High genotypic co-efficient of variation (GCV) was observed for yield per plant, fruit weight whereas low genotypic co-efficient of variation was observed fruit breadth. In all cases, phenotypic variances were higher than the genotypic variance. Differences between genotypic and phenotypic co-efficient revealed that the major portion of the phenotypic variance was genetic in nature. High heritability with low genetic advance in percent of mean was observed in leaf petiole length 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 high genetic advance in percent of mean was observed for yield per plant and days of first male flowering indicated that this trait was under additive gene control and selection for genetic improvement for this trait would be effective. Correlation studies revealed that highest significant association of yield per plant with reproductive characters no. of fruit per plant followed by fruit weight at genotypic and phenotypic level. Path co-efficient analysis revealed maximum direct contribution towards yield per plant with of no. of fruit per plant followed by fruit weight. Considering all the characters the G₄(BD-4580), G₃₁ (BD-8948), G₂₆(BD-4560) and G₂₈ (BD-4569) were selected for future breeding programme.

Keywords: Variability, Genetic advance, Correlation, Path co-efficient, Bottle gourd

Location: Experimental field of Sher-e-Bangla Agricultural University, Dhaka-1207

Start Date: 00-10-2008

End Date: 00-03-2009

Program Area: Variety and Species

Commodity: Bottle gourd

Objectives:

To estimate the amount of variation, the correlation coefficients and path-coefficient in the thirty one genotypes of bottle gourd

Methodology:

The genetically pure and physically healthy seeds of these genotypes were collected from Plant Genetic Resources Centre (PGRC) of Bangladesh Agricultural Research Institute (BARI). The crop was grown at the experimental field of Sher-e-Bangla Agricultural University, Dhaka-1207 during October 2008 to March 2009. The experimental area was situated at 23°77' N latitude and 90°33' E longitude at an altitude of 8.6 meter above the sea level. The experimental field belongs to the Agro-ecological zone of "The Modhupur Tract", AEZ-28. Soil pHranged from 6.0- 6.6 and had organic matter 0.84%. Thirty one genotypes of bottle gourd were used for the research work. The experiment was laid out RCBD design with three replications. The genotypes were distributed into the pit of each block of the prepared layout of the experiment. The thirty one genotypes of the experiment were assigned at random into pits of each replication. The distance maintained spacing pit to pit 3 m. The distance maintained between two blocks was 1 m. Due to uncertain rainfall during the period of the study, the seeds were dibbled in poly bag for higher germination percentage and to get healthy seedlings and when the seedlings the seedlings become 20 days old, those were transplanted in the main field in the pit. Seeds were sown 15^thOctober, 2008. The experiment plot was prepared by several ploughing and cross ploughing followed by laddering and harrowing with tractor and power tiller to bring about good tilth in the first week of October 2008. After final land preparation, pits of 55 cm × 55 cm × 45 cm were prepared in each plot with a spacing of a spacing of 3 m × 1 m. To control field cricket 5 mg Furadan was also mixed with the soils of each pit before making it ready for dibbling. The doses of manure and fertilizers such as Cowdung, Urea, TSP and MOP applied @ 10 ton/ha, 125 Kg/ha, 125 Kg/ha and 150 Kg/ha respectively to the plots for bottle gourd cultivation [5]. Total cowdung, half of TSP and one third MOP were applied in the field during final land preparation. Remaining TSP and one third MOP and whole gypsum and zinc oxide and one third of urea were applied in pit one week prior to transplantation. Remaining urea and MOP were applied as top dressing in four installments at 20, 40, 60 and 75 days after transplanting. Germination of seeds was completed within 12 days and the seedlings of different accessions were planted in the pit on 5th November, 2008. The standard agronomic intercultural operations were done from time to time throughout the cropping season for proper growth and development of the plants. In mature stage fruit fly caused severe damage to the fruit. For protection from fruit fly, MSGT (Mashed Sweet Gourd Trap) and Pheromone bait was used along with ripcord, sevin powder. Fruits were picked on the basis of horticultural maturity, size, color and age being determined for the purpose of consumption as the fruit. Fruits were picked with sharp knife and care was taken to avoid injury of the vine. Data were recorded on the parameters from the studied plants during the experiment such as number of male flowers, number of female flowers, ratio of male and female flowers, fruit length (inch), fruit breadth (inch), number of fruit per plant, Weight per fruit (kg) and yield per plant (kg). The data were analyzed to estimate genotypic and phenotypic co-efficient of variation using the formula of Burton, heritability in broad sense and genetic advance was estimated by the following formula, suggested by Johnson et al. and correlation co-efficient by Miller et al. Mean data of the characters were subjected to multivariate analysis. Univariate analysis of the individual character was done for all characters under study using the mean values and was estimated using MSTAT-C computer programme. Mean, range and co-efficient of variation (CV %) were also estimated using MSTAT-C.

Source of Information: Advances in Biological Research 5 (6): 323-327, (2011)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Considering all the characters, for better performance out of thirty genotypes of bottle gourd G₄(BD-4580), G₃₁ (BD-8948), G₂₆(BD-4560) and G₂₈ (BD-4569) were selected for future breeding programme.

Knowledge Management: Journal