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Evaluation and Characterization of Okra (abelmoschus Esculentus L. Moench.) Genotypes

M. Saifullah
Senior Scientific Officer
Horticulture Research Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur

M. G. Rabbani
Professor
Department of Horticulture, Bangladesh Agricultural University, Mymensingh.

Abstract/ Executive Summary:

One hundred and twenty one okra genotypes collected from different parts of Bangladesh were characterized and evaluated for different quantitative and qualitative traits at Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Jamalpur in summer season, 2004. Significant variations among the genotypes were observed for different characters studied. The GCV and the PCV were very close in most of the characters which indicated less environmental influence on the expression of those characters. The high heritability estimates along with considerable genetic advance were noticed in days to first flowering, plant height, number of primary branches per plant, number of internodes per plant, number of fruits per plant, fruit weight, number of seeds per fruits and fruit yield per plant provided the basis for selection for development of new variety of okra based on phenotypic performance. Genotypes AE009, AE024, AE036, AE061, AE080 and AE087 possessed desirable characters and were selected for further evaluation.

Keywords: Characterization, Evaluation, Genetic parameters, Okra

Location: Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Jamalpur

Start Date: 00-00-2004

End Date:

Program Area: Variety and Species

Commodity: Okra, Evaluation

Objectives:

There are many genotypes (s)/cultivar(s) of okra having diverse characters in different parts of the country. Those genotypes were collected from different parts of the country. The detailed morphological and genetic characters of those genotypes are necessary to know. For the improvement of the yield and other desirable characters, a knowledge of the magnitudes of variation in the available genotypes, the relation of characters with yield, extend of environmental influences on these and the heritability of the materials is essential. Therefore, the present study was conducted to assess the morphological and genetical variability in respect of different economic characters in a set of 121 okra genotypes with the objective that such information would help in selecting genotypes for new variety and planning effective breeding programme for improvement of the crop.

Methodology:

The study was conducted at the Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Jamalpur in 2004. One hundred and twenty one okra genotypes were collected, out of which 75 were from the Department of Horticulture, Bangladesh Agricultural University, Mymensingh, 25 obtained from Plant Genetic Resources Centre and 21 from Horticulture Research Centre of Bangladesh Agricultural Research Institute, Gazipur. Manure and fertilizers were applied in the experimental field as per recommendation (Anonymous, 1997). The experiment was laid out in partial lattice design with three replications. The okra seeds of different genotypes were sown on the March 6, 2004 in rows of raised beds. Plant to plant and row to row spacing was maintained at 40.0 cm and 60.0 cm, respectively. Ten plants were grown in each replication. Necessary cultural operations were done throughout the cropping season to ensure proper growth and development of the plants. Weeding and irrigation was given to the plots as and when necessary. Data were recorded from eight plants of each replication. Green fruits were harvested every alternate day, when they attained edible stage. Harvesting was started from April 24, 2004 and was continued up to July 15, 2004. The data were recorded as per descriptors of vegetables and condiments (Anonymous, 1995). Data were analyzed by MSTAT programme.

Genetic parameters like genotypic and phenotypic coefficient of variation, heritability in board sense and genetic advance in percent mean related to ten economic yield and yield contributing characters were calculated (Singh and Chaudhary, 1985).

Source of Information: SAARC J. Agri., 7 (1), 92-99: 2009

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the above study, it was concluded that the okra genotypes grown in the different parts of the country varied distinctly in respect of different quantitative and qualitative characters. Some genotypes performed high yield as well as tolerance to yellow vein mosaic virus. From the estimates of the genotypic and phenotypic coefficient of variation, heritability in the broad sense and genetic advance in percent means, it was concluded that there was ample scope for improving the yield of okra via days to first flowering, plant height, number of primary branches per plant, number of internodes per plant, number of fruits per plant, average fruit weight, number of seeds per fruits and fruit yield per plant. The result indicated that there was immense scope for improving these characters in okra by selection as well as their utilization in hybridization programme. Therefore, considering all the parameters the genotypes AE009, AE024, AE036, AE061, AE080 and AE087 were selected as promising and recommended for further evaluation for developing a new variety of okra.

Knowledge Management: Journal