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Genetic Variability, Correlation and Path Analysis in Potato (solanum Tuberosum L.)

M. A. Sattar
Olericulture Division, Horticulture Research Centre, BARI, Gazipur 1701, Bangladesh

N. Sultana
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. H. Rashid
Tuber Crops Research Centre, BARI, Gazipur 1701, Bangladesh

A. K. M. A. Islam
Department of Genetics and Plant Breeding, BSMRAU, Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

Genotypic and phenotypic variability, heritability, genetic advance, correlation coefficients and path coefficients analysis were done for yield and its contributing characters in 28 genotypes of potato. High heritability coupled with high genetic advance as percent of mean and high genotypic coefficients of variation were observed for number of tubers per plant, yield per plant and average weight of a tuber suggesting selection for these traits would give good response. Genotypic and phenotypic correlation of the number of tubers per plant and weight of tubers per plant were highly significant. Plant vigour, number of compound leaves per plant and number of tubers per plant, average weight of a tuber and dry matter content of tuber had high degree of positive association with tuber yield per plant. As per path analysis, average weight of tuber and total number of tubers per plant contributed maximum direct effect to tuber yield indicating their importance as selection index for yield improvement.

Keywords: Potato (Solanum tuberosum L.), Genetic variability, Correlation coefficients, Path analysis, Yield

Location: Tuber Crops Research Centre (TCRC), Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur

Start Date: 00-00-2004

End Date: 00-00-2005

Program Area: Variety and Species

Commodity: Potato

Objectives:

The present investigation was carried out in order to study these genetic parameters which would be utilized for further improvement of potato through appropriate breeding programs.

Methodology:

The investigation was carried out at the experimental field of Tuber Crops Research Centre (TCRC), Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur during winter season of 2004-2005. Twenty eight genotypes of potato were used in the study. Among the genotypes, 24 were of CIP origin and rests were standard cultivated varieties in Bangladesh originating in the Netherlands. The experiment was laid out in a randomized complete block design with three replications. The seed tubers were sown in 3m X 3m plots maintaining row to row spacing 60 cm and plant to plant in a row is 25cm. Fertilizers were applied at the rate of 300-200-300-120-120-10 kg N, P, K, Gypsum, Magnesium sulphate and Borax per hectare, respectively. All other cultivation practices were done as per recommendation of the TCRC. Data were recorded from 10 plants randomly selected from the plot of each replication on plant vigour, plant height, compound leaves/plant, days to maturity, number of tubers/plant, average weight of a tuber, dry matter content and yield/plant. Genotypic and phenotypic variation and coefficients of variation, broad sense heritability, genetic advance and genotypic correlation coefficients were estimated using the formula suggested by Singh and Chaudhury (1979), Miller et al. (1958), Johnson et al. (1955) and Al-Jibouri et al. (1958). Path coefficients analysis was done according to the method suggested by Dewey and Lu (1959).

Source of Information: Bangladesh J. Pl. Breed. Genet., 20(1) : 33-38, 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The residual effect (0.201) indicated that about 80 percent of the variability in yield per plant was contributed by the eight characters studied in path analysis. This residual effect towards yield in the present study might be due to many reasons such as other characters which were not studied, environmental factors and sampling errors (Sengupta and Karatia, 1971). Within the scope of the path analysis carried out in the present investigation, it is, therefore, suggested that the number of tubers per plant and average weight of tuber weight which are the main components of yield should be given high priority in the selection programme.

Knowledge Management: Journal