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Combining Ability and Heterosis in Snakegourd (tricosanthes Cucurminata L)

R. Podder
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. A. Islam
Department of Genetics and Plant Breeding Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

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

J. U. Ahmed
Department of Crop Botany, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

Abstract/ Executive Summary:

A half diallel set of five parents and their 10 F₁’s were studied to determine the combining ability and magnitude of heterosis for eight important characters in snake gourd at the experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University during April to July, 2004. Combining ability analysis revealed that both general and specific combining ability variances were significant for all the characters except fruit diameter and fruit yield per plant. Predominance of additive gene action was noted for all the characters except days to first female flower where non-additive gene action was predominant. Parent P₁ was the best general combiner for fruit yield and some yield contributing characters. Among the crosses P₂ x P₃, P₁x P₂ and P₁ x P₄ were the best specific combiner for fruit yield and some of yield contributing characters. Both positive and negative heterosis was obtained of which few hybrids showed desirable and significant values. P₂ x P₅ showed the highest significant mid parental heterotic value for earliness and high yield whereas, P₁ x P₂, P₂ x P₃, P₂ x P₅ and P₃ x P4 showed the highest significant better parent heterotic effect for earliness and high yield.

Keywords: Snakegourd,Combining ability, Heterosis, Fruit yield

Location: BSMAU, Gazipur

Start Date: 00-04-2004

End Date: 00-07-2004

Program Area: Variety and Species

Commodity: Snake gourd

Objectives:

To identify high heterotic parental combination in order to develop hybrid variety with good quality fruits.

Methodology:

Five parents (P₁=SG001, P₂=SG004, P₃=SG007, P₄=SG008 and P₅=SG025) were crossed in a diallel fashion excluding reciprocals during Kharif 2003. The parents and their 10 F₁’s were grown in following Randomized Complete Block Design (RCBD) with four replications under normal sowing condition during Kharif 2004 in the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh. The individual plot was comprised of a single row of 5 meter long. The spacing between rows and that between pits within row was 50 cm and 1.5 meter respectively. Seeds of the all five parents and their F₁’s were soaked in water for 24 hours before sowing. Intercultural operations like irrigation, weeding, stacking etc. were done according to schedule and as necessary. Observations were recorded on each plant for days to male and female flower, node number of male and female flower, total number of fruits per plant, average fruit diameter (cm), average fruit length (cm) and fruit yield per plant (g). The data were analyzed for combining ability following model I (fixed effect) and method II of Griffing (1956). Genotypic and phenotypic correlation coefficients were calculated according to Miller et al., (1958). Heterosis based on mid and better parent was calculated following Mather and Jinks (1971).

Source of Information: Bangladesh J. Pl. Breed. Genet., 23(2): 01-06, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Combining ability analysis revealed that both general and specific combining ability variances were significant for all the characters except fruit diameter and fruit yield per plant. Predominance of additive gene action was noted for all the characters except days to first female flower where non-additive gene action was predominant. Parent P₁ was the best general combiner for fruit yield and some yield contributing characters. Among the crosses P₂ x P₃, P₁x P₂ and P₁ x P₄ were the best specific combiner for fruit yield and some of yield contributing characters. Both positive and negative heterosis was obtained of which few hybrids showed desirable and significant values. P₂ x P₅ showed the highest significant mid parental heterotic value for earliness and high yield whereas, P₁ x P₂, P₂ x P₃, P₂ x P₅ and P₃ x P4 showed the highest significant better parent heterotic effect for earliness and high yield.

Knowledge Management: Journal