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Combining Ability of Eggplant (solanum Melongenal.) for Plant and Flowering Characters During Summer

MSUddin*
Department of Agroforestry and Environmental Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

MM Rahman
Department of Horticulture, Bangabandhu Sheikh MujiburRahman Agricultural University, Gazipur-1706, Bangladesh

M M Hossain
Department of Horticulture, Bangabandhu Sheikh MujiburRahman Agricultural University, Gazipur-1706, Bangladesh

M A KMian
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

Abstract/ Executive Summary:

Combining ability in eight eggplant genotypes were studied at Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh during March 2007 to September 2008. Eggplant genotypes were crossed and evaluated for different plant and flower characters. Considering general combining ability (GCA) effects, the parents P3, P4 and P7 were the good general combiner for promoting early flowering and fruiting and P3, P4 and P6 for plant height and canopy. Considering specific combining ability (SCA) effects, the cross P1×P6, P1×P4, P1×P8 and P1×P7 were important for early flowering and fruiting; P3×P8 for plant height and canopy and P5×P7 for plant canopy. Therefore, for the improvement of flowering and plant characters the parents P3, P4, and P7 and the crosses P1×P6, P1×P4, P1×P8 and P1×P7 could be selected for summer cultivation in Bangladesh.

Keywords: Combining ability, Eggplant, Flower character, Summer

Location: Experimental field of BSMRAU, Gazipur, Bangladesh

Start Date: 00-03-2007

End Date: 00-09-2008

Program Area: Crop-Soil-Water Management

Commodity: Brinjal

Objectives:

The present study was undertaken to determine the general combining ability (GCA) of the selected parents and specific combining ability (SCA) of the crosses and to know the combining ability of the parents for plant and flowering characters.

Methodology:

The present study was carried out at the experimental field of BSMRAU, Gazipur, Bangladesh during March 2007 to September 2008. Eight parents and 28 F1hybrids produced from those parents were used as plant materials for the study. The selected eight parental genotypes were grown during summer 2007 for crossing in a half diallel fashion. For effective pollination and fertilization, the flower buds which just changed their color from green to purplish white and about to bloom next day were selected. Emasculation and pollination were done in the same day from 7.30-11.00 a.m. The pollinated flowers were bagged with butter paper and tagged along with necessary information. After complete maturity, some mature fruits from eight selfed parents and 28 F1 crosses were harvested for obtaining the parental and F1 hybrid seeds. Then the seeds of parents and F1s were collected, air dried and preserved in desiccators with proper label and used for the study in the next season. Seeds of the selected parents and F1 hybrids were sown on 14 March 2008 and after necessary hardening the seedlings were transplanted in the main field on 20 April 2008. The experiment was laid out in a randomized complete block design with 3 replications. Ten seedlings were planted in a unit plot with a plant spacing of 70 cm apart in single row maintaining 50 cm drain between the plots. Twenty eight F1hybrids along with their selected eight parental lines were grown for studying the combining ability. Observations were made on plant height, plant canopy, days to 1stflowering, days to 50% flowering, days to 1stfruit harvesting. The collected data were subjected to combining ability analysis following Model I and Method 2 (halfdiallel fashion) of Griffing (1956a). Griffing’s analysis (Griffing, 1956b) was intended to determine the performance of the parents and their relative contribution to the F1’s as determined by general and specific combining ability (GCA and SCA) effects.The calculation of combining ability was performed from the following formula:Xijk = μ+gi+gj+sij+eijk; where, Xijk is the genotype score, μ is the overall mean of the experiment, so that all other scores are expressed as deviations from this mean, gi is the GCA effects of the ith parent, gjis the GCA effects of the jth parent, sij SCA of the hybrid, eijk is the error deviation of the particular plot. For the calculation of GCA of the parents and SCA of the hybrids, the mean was calculated over blocks andGCA and SCA were estimated from the means. Each column (or row) represented entries with one parent in common and crossed to all other parents including self. The column was referred to as an array. The GCA of any parent was estimated as the difference between its array mean and the overall mean.Similarly, SCAs of the hybrids was also calculated as: Sij= X-(μ+gi+gj); where, X is the score of the hybrid between the ith and jth parents and the other terms are defined as above.

Source of Information: J. Sylhet Agril. Univ. 1(2):221-226, 2014 ISSN: 2308-1597

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Considering general combining ability effects, the parents P3, P4and P6 were the good general combiner for plant height and canopy and P3, P4, and P7 for early flowering and fruiting. Considering specific combining ability effects, the cross P3×P8 was important for plant height and canopy, P5×P7 for plant canopy; P1×P6, P1×P4, P1×P8 and P1×P7 were important for early flowering and fruiting. For improvement of flowering and plant characters the parents P3, P4, and P7 and the crosses P1×P6, P1×P4, P1×P8 and P1×P7 could be selected for summer season cultivation in Bangladesh.

Knowledge Management: Journal