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Heterosis in Relation to Genetic Diversity in Snakegourd (tricosanthes Cucumerina L.)

HZ Raihan
Scientific Officer
Plant Breeding Division BARI, Gazipur

MS Raihan
Associate Professor
Dept. of Genetics and Plant Breeding, BSMRAU Gazipur

MAU Zaman
SO
Rice Farming Systems Division, BRRI Gazipur

MAK Mian
Professor
Dept. of Genetics and Plant Breeding, BSMRAU Gazipur

Abstract/ Executive Summary:

An investigation on relationship between genetic divergence and heterosis in snake gourd (Tricosanthes cucumerina) with eight parents and their fourteen F₁s was conducted during the summer season of 2009 at the experimental farm, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706. None of the hybrids showed maximum heterosis for all the characters studied. Five hybrids, SG-01 × SG-18, SG-01 × SG-19, SG-18 × SG-25, SG-25 × SG-18 and SG-26 x SG-19 showed significant and desirable mid and better parent heterosis for earliness and fruit yield per plant. The parents from high inter-genotypic values produce significant heterotic response for most of the characters in their hybrids. In most of the crosses higher expression of heterosis was observed with the increasing of inter genotypic values. The cross combinations involving the parents having medium genetic divergence between them were found to exhibit considerable heterosis for higher fruit yield and earliness. A positive correlation between Inter genotypic distance (D²) and heterosis were observed for most of the characters.

Keywords: Heterosis, Genetic Diversity, Correlation coefficient, Snakegourd

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur

Start Date: 00-03-2009

End Date: 00-06-2009

Program Area: Variety and Species

Commodity: Snake gourd

Objectives:

To study the heterosis and genetic diversity, which is the prerequisite for developing high yielding snake gourd variety or hybrid variety in Bangladesh.

Methodology:

Eight parents (P₁=SG-01. P₂=SG-04, P₃=SG-06, P₄=SG-10, P₅=SG-18, P₆=SG-19 P₇=SG-25 and P₈=SG-26) and their fourteen (14) F₁s were used as an experimental materials, supplied from the Department of Genetics and Plant Breeding, BSMRAU, Salna, Gazipur. The experiment was laid out in a Randomized Complete Block Design (RCBD) with two replications. The experiment field was divided into three blocks and the blocks were subdivided into nineteen plots where genotypes were randomly assigned. Beds of each entry containing two pits were raised with 15 – 20 cm made by spade and developed properly. Recommended doses of manure and fertilizer were applied in the experimental field (BARI, 2005). Seeds of the eight parents and their F₁s were first allowed to soak water for 24 hours. The soaked seeds were then sown in polythene bag (size 15 × 15 cm), containing a mixture of soil and well decomposed cow dung (1:1). Thirty five days old seedlings were transplanted in main field. Two pits for every genotype in each replication were maintained. Irrigation, weeding and stacking etc. were done according to schedule and as necessary. The experiment was conducted at the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur during the months from March to June, 2009. The location of the site was about 40 km north of the Dhaka city with 24.09 ⁰N latitude and 90.26⁰E longitude and an elevation of 8.40 meter from the sea level. The experimental site was situated in the subtropical climate zone, characterized by m rainfall during the month of May to September and scanty rainfall during the rest of the year. The soil of the experimental field was clay loam in texture and acidic in nature having a pH of around 5.8 with poor fertility status. It belongs to the Salna soil series of "Shallow Red Brown Terrace" under "Madhupur tract" (Brammer, 1971; Haider et al., 1991). Data were collected on each of the eight parents and their F₁s for Days to first male flowering, Days to 100% male flowering, Days to first female flowering, Days to 100% female flowering, Days to green fruit harvest, Fruit length (cm), Fruit diameter (mm), Fruit weight (g), Total number of fruits per plant, Fruit yield/plant (Kg). The mean data for each character were analyzed statistically using the GeneStat software. For univariate analysis, analyses of variances were done individually by F-test according to Panse and Shukhatma (1978). Heterosis was recorded as mid parent heterosis (Hm) and better parent heterosis (Hb) by the formula by Falconer (1960). Correlation coefficient between inter-genotypic distances of parents and heterosis of the hybrids were computed for all the characters according to Singh and Choudhury (1979).

Source of Information: Eco-friendly Agril. J. 10(04):52-57, 2017 (April)

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Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results of the study indicate that five hybrids, SG-01 × SG-18, SG-01 × SG-19, SG-18 × SG-25, SG- 25 × SG-18 and SG-26 x SG-19 showed significant and desirable mid and better parent heterosis for earliness and fruit yield per plant. So, these hybrids might be considered as promising combinations for development of commercial snakegourd hybrid varieties.

Knowledge Management: Journal