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Combining Ability and Genetic Variability Studies in Potato

A. Haydar
Department of Botany, University of Rajshahi, Rajshahi-6205, Bangladesh

E. H. Khokan
Department of Botany, University of Rajshahi, Rajshahi-6205, Bangladesh

T. Ara
Department of Botany, University of Rajshahi, Rajshahi-6205, Bangladesh

M. K. Alam
Regional Agricultural Research Station, BARI, Ishurdi, Pabna, Bangladesh

K. M. Khalequzzaman
Regional Agricultural Research Station, BARI, Ishurdi, Pabna, Bangladesh

Abstract/ Executive Summary:

Seventeen potato genotypes comprising seven parents and their ten crosses were evaluated during to November 2005 to March 2006 to study their combining ability and genetic variability. Mean squares due to GCA and SCA were highly significant for all the characters except number of branches/plant and dry matter content for which SCA mean square was non-significant. The mean squares due to GCA were found to be lower than SCA indicated pre-dominance of non-additive gene action for all the characters studied. The parents TPS-7, TPS-364, Hera and Chamak were found best general combiners for tuber yield and other important characters. The crosses TPS-7 × TPS-13, TPS-364 × TPS-13, TPS-13 × MF-11, Hera × TPS-19 and Chamak × TPS-13 were observed to be the most promising hybrid combinations for yield and other yielding components. High estimates of co-efficient of variability, heritability and genetic gain for plant height, number of branches, tubers number and yield indicated that these traits are largely controlled by additive gene action and that strength selection for them would be effective.

Keywords: Potato, Combining ability, GCA, SCA, Tuber yield

Location: Botanical Research Garden at Department of Botany of Rajshahi University, Rajshahi-6205, Bangladesh

Start Date: 20-11-2005

End Date: 25-03-2006

Program Area: Variety and Species

Commodity: Potato

Objectives:

Objective of this study was to study the genetic information about combining ability and variability in potato.

Methodology:

The experiment was conducted at Botanical Research Garden at Department of Botany of Rajshahi University, Rajshahi-6205, Bangladesh during Rabi season of November 2005 to March 2006. The materials used for the present study including seven parents and their ten crosses, which were planted on 20 November 2005. The experiment was carried out following randomized block design with three replications. Each genotype (tuber) was grown in a single row plot of 1 m long in each replication. The spacing was maintained 25 cm between rows and 5 cm between plants. Fertilizers were applied @150,120 and 30 kg/plot of N, K and P, respectively. Standard agronomic practices were followed and plant protection measures were taken when required. Observations were recorded on five randomly selected plants for plant height (cm), number of leaves/plant, number of tillers/plant, number of tubers/plant, dry matter content and tuber yield (g/plant). General (GCA) and specific (SCA) combining ability were estimated. Genetic variability, heritability and genetic advance as percentage of mean (genetic gain) were computed as per the methods.

Source of Information: J. Soil. Nature. 3 (2):01-03, 2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It showed significant SCA effects for all the sip characters in order. These crosses can be considered as promising hybrids. In general it was observed that the parents TPS-364, chamak, TPS-13, MF-11 and TPS-67 which are categorized as good general combiners have given better hybrids with other parents. Therefore, it appears that for getting good cross combinations GCA of parents is very important.

Knowledge Management: Journal