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Combining Ability of Eggplant (solanum Melongenal.) Genotypes for Yield and Yield Components During Summer

MS Uddin*
Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

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

M M Hossain
Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman 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 crossed and studied at Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh during March 2007 to September 2008. Eggplant genotypes were crossed and evaluated for yield and yield contributing characters. Considering general combining ability (GCA) effects, the parents P1, P2 and P6 were better general combiner for number of fruits plant^-¹ and yield plant^-1; P3, P5 and P8 for fruit weight; P4 for fruit length and P3 and P8 for fruit breadth and P1, P6, P2 and P7 for yield plant^-1. Considering specific combining ability (SCA) effects, the crosses P5×P7 were important for fruit length, fruit weight, number of fruits and yield plant^-1; P5×P8 for fruit breadth, fruit weight, and yield plant^-¹; P1×P6 and P2×P7 for fruit breadth, number of fruit and yield plant^-1; P1×P6, P2×P7, P4×P7 and P5, P7 for number of fruits and yield plant^-1. Therefore, the parents P1, P6, P2 and P3, P5 and P8 could be considered as better parents for higher yield and the crosses P1×P6, P5×P7, P2×P7, P2×P4, P4×P7, P4×P8, P3×P8 and P5×P8 could be considered as promising hybrids for getting higher yield for summer cultivation in Bangladesh.

Keywords: Combining ability, Eggplant, Yield, Summer

Location: Experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh

Start Date: 00-03-2007

End Date: 00-09-2008

Program Area: Variety and Species

Commodity: Brinjal

Objectives:

Eight diverse parents were taken in this investigation to estimate the combining ability effects in eggplant for yield and yield contributing characters.

Methodology:

The present study was carried out at the experimental field of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh during March 2007 to September 2008. Eight parents and 28 F1 hybrids produced from those parents were used as plant materials for the study. The selected eight parental genotypes were grown in 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 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. Twenty eight F1 hybrids along with their selected eight parental lines were grown for studying the combining ability. Seeds were sown on the tray 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. Observations were made on yield and yield contributing characters viz. days to1^st fruit harvesting, fruit length, fruit diameter, individual fruit weight, number of fruits plant^-1 and yield plant^-1. The collected data were subjected to combining ability analysis following Model I and Method 2 (half diallel 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, gi is 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 and GCA 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. This 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):213-219, 2014 ISSN: 2308-1597

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Considering general combining ability effects, the parents P3, P5 and P8 were considered as better general combiner for fruit weight; P1, P2, P6 for number of fruits plant^-1; P1, P6, P2 and P7 for yield plant^-1. Considering specific combining ability effects, the crosses P1×P6, P5×P7, P2×P7, P2×P4, P4×P7, P4×P8, P3×P8 and P5×P8 were better hybrids for improving yield plant^-1 in eggplant. Therefore, the parents P1, P6, P2 and P3, P5 and P8 could be considered as better parents for higher yield and the crosses P1×P6, P5×P7, P2×P7, P2×P4, P4×P7, P4×P8, P3×P8, P5×P8 could be considered as promising hybrids for getting higher yield for summer season cultivation in Bangladesh.

Knowledge Management: Journal