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Segregation Pattern and Inbreeding Depression in F2 Generation of Some Hybrid Okra Varieties

Sonia Akter Laboni
Department of Genetics and Plant Breeding, Faculty of Agriculture, Patuakhali Science and Technology University, Bangladesh

S.M. Ahsan
Department of Horticulture, Faculty of Agriculture, Patuakhali Science and Technology University, Bangladesh

Shepon Chandra Ghosh
Department of Crop Botany, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Eftekhar Mahmud
Scientific Officer, Bangladesh Agricultural Research Institute, Gazipur, Bangladesh

MostafizurRahman Talukder
Principal Scientific Officer, Bangladesh Agricultural Research Institute, Gazipur, Bangladesh

Soleh Akram
Department of Genetics and Plant Breeding, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Sayeed Shahriyar
Department of Biotechnology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abdulla-Al-Asif
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted in randomized complete block design (RCBD) with three replications in the experimental field of Regional Horticulture Research Station (RHRS), Bangladesh Agriculture Research Institute (BARI), Lebukhali, Patuakhali during April, 2014 to October, 2014 for assessing the inbreeding depression, genetic parameters, gene action and segregation pattern of Okra [Abelmoschusesculentus (L.) Moench]. The experiment was comprised of five commercial hybrid Okra genotypes such as Tara sonali, Bimala, Juboraj, Suvo 1 and Noor, their respective F₂ progenies along with a check variety named as BARI Dherosh 1. Results of the experiment indicated that there were considerable variability among the F₁and their F₂. The yield were in-between 14.81 to 7.92 Kg plot^-1 in case of F₁ generation, which deteriorate to 10.32 to 5.32 Kg plot^-1 in F₂ generation. Broad sense heritability computed through variance component method showed that all the quantitative traits were moderate to highly heritable. The trait yield per plot exhibited 68.83% broad sense heritability coupled with 50.96% genetic advance suggesting the existence of sufficient amount of genetic variability for improvement of this trait and also indicates that the trait is more amenable to selection and could be improved easily. In case of segregation pattern, plant height and pod pubescence content exhibit as polygenic trait. Leaf shape, fruit base shape and branching pattern showed complete dominance and fruit color displayed incomplete dominance. The present investigation thus provide information about the nature and magnitude of genetic variation, segregation pattern and inbreeding depression for yield and its components in okra so as to formulate suitable breeding strategy and isolate potential parents and promising crosses for further breeding program.

Keywords: segregation pattern; inbreeding depression; F2 generation; okra

Location: A field experiment was conducted at the Research field of Regional Horticulture Research Station (RHRS), Lebukhali, Dumki, Patuakhali

Start Date: 00-04-2014

End Date: 00-10-2014

Program Area: Variety and Species

Commodity: Okra

Objectives:

To formulate suitable breeding strategy and isolate potential parents and promising crosses for further exploitation.

Methodology:

A total of eleven materials were used in this experiment. Among the materials, five were commercial F1 okra varieties; five were their F2 generations and one check variety. The okra variety used in the experiment was Tara Sonali, Bimala, Noor, Suvo-1 and Juboraj and their F2 derivatives with the cheak variety BARI Dherosh 1.F2 seeds were collected from Regional Horticulture Research Station (RHRS), Lebukhali, Dumki, Patuakhali and F1’s were collected from different seed retailers of Barisal.

The experiment was laid out in RCBD with three replications. The whole field was divided into three blocks and each block consisted of eleven (11) plots. The replications were separated from one another by 1 m. The distance between plots was 50 cm. The treatment was randomly assigned to each of the block. However, Each F1 and its respective F2 were planted side by side. Plot size for F1’s and checks variety was 1m x 4m.

Morphological data were collected from five randomly selected plants for each accession based on International Board for Plant Genetic Resources (IBPGR) recommended descriptor procedures for Okra (Charrier, 1984). Data were collected as specified. These are: Days to 50% flowering, First harvesting date, Node order of 1st flowering, No of fruit per plant, Fruit weight, Plant height, Fruit Length, Fruit Diameter, Yield per plot, Internodal length, etc.

Analysis of variance was done for all the characters under study using the mean values (Singh and Chaudhury, 1985). Duncan's Multiple Range test (DMRT) was performed for all the characters to test the difference between the means of the genotypes following Steel and Torrie (1960).

Source of Information: Asian J. Med. Biol. Res.2015, 1 (2), 316-335; doi: 10.3329/ajmbr.v1i2.25627 (Asian Journal of Medical and Biological Research) ISSN 2411-4472 (Print) 2412-5571 (Online) www.ebupress.com/journal/ajmbr

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The experiments were conducted to observe the genetic variability, inbreeding depression and segregation pattern of Okra among five commercial hybrid varieties along with a local check based on their performance, heritability and inheritance study among the varieties for improvement of yield of Okra. The experiments were carried out at the experimental farm of RHRS, Lebukhali, Patuakhali, during the period of May, 2014 to September, 2014. The results of the studies have been summarized as follows: There was significant variation among the F1’s, their F2 progenies and the check variety. However, all the F1’s performed better than their respective F2 progenies for yield and other yield contributing characters. F1 and F2 both generations showed low to moderate level of heritability. No of fruit per plant and Yield were moderately heritable, whereas, days to 50% flowering, days to 1st harvesting, node order of first flowering, Fruit weight, Plant height, Internodal length, Fruit length and Fruit diameter were poor in heritability. Due to selfing the progenies become more homozygous and decline in vigor and the reduction in productivity. In case of segregation pattern plant height, leaf shape, pod pubescence content, peduncle shape, branching pattern and fruit color were subjected to study. Plant height and pod pubescence content are found to be polygenic trait. Fruit color showed incomplete dominance and other character expressed as Mendelian ratio.

Knowledge Management: Journal