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Genetic Variability and Correlation Studies Among Yield and Yield Contributing Characters of Yardlong Bean (vigna Unguiculata Ssp. Sesquipedalis L. Verdc.)

Muhammad Shahidul Haque
Department of Biotechnology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Afifa Azad
Department of Biotechnology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Nihar Ranjan Saha
Department of Biotechnology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Mohammad Monirul Islam
Department of Biotechnology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Twenty-five genotypes of yardlong bean were planted in the field to determine genotypic variances and correlations among characters related to yield. Analysis of variance revealed a highly significant difference among the genotypes for all traits, indicating the presence of variability. The phenotypic coefficients of variations were found slightly higher than the genotypic coefficients of variations, which suggests that the apparent variation is not only genetic but also influenced by the growing environment. High heritability and a high genetic advance were observed in pod yield per plant, pod weight, and the number of pods per plant. Yield/plant was positively and significantly correlated with the number of pods/plant, pod length, and the number of seeds/pod. The combination of the high heritability along with high genetic advance provides a clear image of the traits in the selection process reflecting the presence of additive gene action for the expression of these traits and improvement of these characters could be done through selection.

Keywords: Correlation coefficient, GCV, Genetic advance, Genetic variance, Heritability

Location: Plant Genetic Resources Center (PGRC), Bangladesh Agricultural Research Institute (BARI)

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Yard long bean

Objectives:

To understand the magnitude of genotypic as well as phenotypic variation, heritability, and genetic advance along with correlation coefficients of yield contributing traits among the collected accessions/genotypes of yardlong bean in Bangladesh.

Methodology:

A total of 25 yardlong bean genotypes were included in this experiment. Sixteen accessions were collected from the Plant Genetic Resources Center (PGRC), Bangladesh Agricultural Research Institute (BARI), and others were collected from farmers and also from the local seed market. The experiment, laid out in RCBD, was replicated thrice. The plot size was 100 × 50 cm with three rows. At maturity three plants were selected from each replication of each accession and data were recorded for 14 quantitative characters viz. plant height, number of branches per plant, days to flowering, days to fruit set, number of pods per plant, pod length, breadth, and single pod weight, number of seeds per pod, seed length, seed breadth, 100-seed weight, dry weight of 100- seed, pod yield per plant. The collected data were ANOVA to test the variations among genotypes. The analysis of variance was calculated using the Statistical Analysis System (SAS) software version 9.2 (SAS 2008). The genotypic and phenotypic coefficient of variation was calculated by Kwon and Torrie (1964) technique.

Source of Information: Bangladesh J. Bot. 50(1): 93-101, 2021 (March)

Article Link (Online Journal): DOI: https://doi.org/10.3329/bjb.v50i1.52676

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded from the results of this study that genetic variability within the selected genotypes is very high for yield contributing traits. A high PCV and GCV for the characters indicated that environmental influences on the expression of these traits were minor. Based on the findings in this study, pod yield per plant, pod weight, and the number of pods per plant could be useful criteria for selection in the yardlong bean improvement because these characters had a high genotypic coefficient of variation, heritability estimate, and genetic advance. Besides pods/plant and seeds/pod had the highest positive and direct effect on yield. Therefore, it is recommended that these characters should be used for the development of high-yielding varieties through selection.

Knowledge Management: Journal