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Genetic Variability, Correlation and Path Coefficient Analysis of Yield and Quality Traits in Pumpkin (cucurbita Moschata Duch Ex Poir.)

S. Akter
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. G. Rasul
Department of Genetics and Plant Breeding,Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

A. K. M. Aminul Islam
Department of Genetics and Plant Breeding,Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. M. Hossain
Dept. of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University,Gazipur 1706, Bangladesh.

Abstract/ Executive Summary:

The experiment was conducted to study variability, correlation coefficient and path analysis for yield and quality related traits of 30 pumpkin genotypes. Significant variations were found among the genotypes for most of the characters studied. High genotypic coefficient of variation (GCV) and high heritability coupled with high genetic advance in percent of mean were observed for beta-carotene followed by non-reducing sugar, number of seeds per fruit, yield per plant, dry weight, flesh thickness, number of male flowers per plant and number of female flowers per plant which indicated that these characters were under additive gene control and selection for genetic improvement for these traits might be effective. Correlation co-efficient between yield per plant with number of primary branches, number of fruits per plant and single fruit weight were positive and highly significant. On the other hand, days to first female flower, number of male flowers per plant, ß- carotene and total sugar showed positive and insignificant correlation with yield per plant. But correlation between brix content and yield per plant were significantly negative. Path coefficient analysis revealed that the maximum direct contribution towards yield was obtained through number of fruits per plant followed by days to first female flower and single fruit weight indicated that these traits should be considered as primary components of yield. Negative direct effect on yield was exerted by total sugar followed by number of female flowers per plant, reducing sugar and brix content. Considering all the qualitative and quantitative traits ten genotypes as G7, G13, G14, G17, G18, G19, G20, G22, G27, G29 among thirty were selected and suggested to be selfed for the development of inbred line for use in future breeding programme.

Keywords: Variability, Heritability, Genetic advance, Correlation, Path co-efficient and Pumpkin.

Location: Research Farm of the Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU) Salna, Gazipur

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Variety and Species

Commodity: Pumpkin

Objectives:

The present study was undertaken to estimate the genetic variation, the correlation coefficients and path-coefficient and to screen out the suitable parental groups with better performances for future breeding program in the thirty genotypes of pumpkin.

Methodology:

The experiment was conducted with 30 accessions of pumpkin at the Research Farm of the Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU) Salna, Gazipur during the growing season 2011-12. Thirty pumpkin genotypes maintained by the Department of Genetics and Plant Breeding, BSMRAU were used as experimental materials. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. The distance between plot and block were 100cm. The seeds were sown in (9×18) cm² diameter polyethylene bags on 3rd November 2011. Three seeds were sown in each bag. The germination medium was prepared by mixing compost and soil in 50:50 proportions. Intensive care was taken for production of healthy seedlings. The plots were raised 10 cm above ground level. Pits of 50x50x30 cm³ size were dug at a spacing of 2x2 m². Each pit was fertilized with 10 kg Cow dung, 52g TSP, 60g Urea and 40g MP respectively to ensure proper growth and development of plant (Brammer, 1971). Cowdung and pit soil were mixed together. One-third of urea and the entire quantity of other fertilizers were applied at final land preparation. The rest two-thirds of urea were top dressed before the time of branching and flowering in two installments. Twenty days old seedlings were transplanted in well prepared experimental plot on 22nd November 2011. The seedlings were watered immediately after transplanting. Four plants of each genotype were accommodated in each replicated plot maintaining 2×2m² spacing. Routine weeding was done to keep the field free from weeds and to pulverize the soil. Irrigation was done as and when required. The fruits were harvested when the peduncle dried on maturity. Data were recorded for Days to first male flower, Days to first female flower, Number of male flowers per plant, Number of female flowers per plant, Number of primary branches per plant, Number of secondary branches per plant, Fruit Diameter (cm), Fruit length (cm) Flesh thickness (cm), Hollowness (cm), Number of fruits per plant, Single fruit weight (kg), Number of seeds per fruit, Dry matter content, Total soluble solid, Beta-carotene (mg/100g), Total sugar (g/100g), Reducing sugar (g/100g), Non-reducing sugar (g/100g) and Yield per plant (kg). The data were analyzed to estimate genotypic and phenotypic co-efficient of variation using the formula of Burton (1952), heritability in broad sense using the formula of Lush (1949), genetic advance and correlation co-efficient were estimated by the following formula, suggested by Johnson et al. (1955). Path analysis was worked out as suggested by Dewey and Lu (1959). Mean, range and co-efficient of variation (CV %) were estimated using MSTAT-C.

Source of Information: Bangladesh J. Pl. Breed. Genet., 26(1): 25-33, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Positive direct effect was exhibited by yield per plant in building up the correlation with yield. Number of primary branches per plant, number of fruits per plant and single fruit had positive and highly significant genotypic correlation with yield. Days to first female flower, number of male flowers per plant, beta-carotene and total sugar had positive and insignificant genotypic correlation with yield. The contributions of negative and positive indirect effects via different parameters were responsible for exhibiting the negative total genotypic correlation with yield. The result of the present experiment revealed that a wide variation existed among the pumpkin genotypes. Also there was correlation of different yield components with the yield of pumpkin.

Knowledge Management: Journal