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Genetic Variability, Character Associat and Path Analysis in Yard Long Bean

M Z Ullah
Energypac Agro Limited, Bangladesh

M J Hasan
PSO
Hybrid Rice Project, BRRI, Gazipur-1701, Bangladesh

A H M A Rahman
Ph.D fellow
BSMRAU, Gazipur, Bangladesh

A I Saki
Assistant Director
BADC, Tangail, Bangladesh

Abstract/ Executive Summary:

Genetic variation, character association and cause-effect analysis were done for yield and yield contributing characters in 20 genotypes of yard long bean during Kharif season of 2010 at the Research and Development Farm of Energypac Agro Ltd, Monipur, Hotapara, Gazipur. The genotypic coefficient of variation was high for pod yield, pod weight and pods/plant. High to moderate heritability as well as high genetic advances were estimated for days to first flowering, days to marketable harvest, pod yield, number of pods per plant and pod weight. Association studies revealed that genotypic correlation coefficients were higher than their phenotypic correlation coefficients in most of the cases. Pod yield per plant showed strong positive genotypic correlation with number of pods per plant, pod weight, pod length and pod diameter. The maximum direct positive effect was observed of pod weight and number of pods per plant to pod yield in cause effect analysis. For selecting high yielding genotypes emphasis should be given on pod weight, number of pods per plant and pod length.

Keywords: Yard long bean, Genetic association, Path analysis

Location: Research and Development (R&D) Farm of Energypac Agro Ltd. Monipur, Hotapara, Gazipur

Start Date: 00-00-2010

End Date: 00-00-2010

Program Area: Variety and Species

Commodity: Yard long bean

Objectives:

To find out and establish suitable selection criteria for higher vegetable pod yield through study of genetic variability, interrelationship and cause effect analysis between yield and its components in yard long bean.

Methodology:

Twenty yard long bean genotypes representing three cultivars developed by Energypac Agro Ltd.,( Green long , Lal Badami and Gritosundori); two exotic varieties from China and India and the rest 15 collected from local sources were included for the study. The local varieties were developed through pure line selection from indigenous germplasm. The cultivars were raised in randomized block design with three replications in the Research and Development (R&D) Farm of Energypac Agro Ltd. Monipur, Hotapara, Gazipur during kharif season, 2010. Plot size was 8.0 m x 1.0 m. with spacing of 0.6 m between rows and 0.3 m between plants. Plants were trailed on bamboo stick and tied with GI wire as inverse V shape thus 1.5 m apart along vertical rows of plants. The crop was raised following the agronomic practices recommended by BARI (2006). Data on number of days to first flowering (DFF), days to marketable harvest (DMH), number of pods per plant (PP) and pod yield per plant (PY) were collected from ten randomly selected plants from each plot. Again pod characters viz., pod length (PL) (cm), pod diameter (PD) (cm), pod weight (PW) (g) and number of seeds per pod (SP) were recorded from 10 randomly selected pods at maturity stage from each plot. The analysis of variance was done using MSTAT C software. The components of variance including error variance (σ²_e) genotypic variance ( σ²_g) and phenotypic variance (σ²_p) were estimated, according to the following formula (Johnson et al ., 1955). Heritability (H) was calculated based on the formula (σ²_g/ σ²_p) used by Singh and Ceccarelli (1996). The coefficient of genotypic and phenotypic variation was evaluated according to Burton’s formula (Burton, 1952) as the square root of σ 2 g and σ 2 p divided by the mean and converted into percentage, and the genetic advance was estimated according to Allard (1960), [GA = (k) (H) (p 2 σ)]. 2.06, where values for k, was used to obtain the GA. M eanwhile, Normal Pearson correlation was calculated using SPSS 10.0 software. The phenotypic and genotypic correlation between variable x and y were also estimated following Kwon and Torrie (1964). Finally the path analysis was done based on Dewey and Lu (1956) to partition the correlation coefficients of pod yield into direct and indirect effects.

Source of Information: SAARC JOURNAL OF AGRICULTURE, Vol. 7, Issue 2, 2011, pp. 09-16, ISSN 1682-8348, SAARC Agricultural Information Centre.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In view of the high estimates of genotypic coefficient of variation, heritability and genetic advance, the characters viz., pod yield per plant, number of pods per plant and pod weight were found prominent in the present study. On the other hand number of pods per plant and pod weight showed significant positive correlation with high direct effect on pod yield. It is concluded that these characters should be given due importance in selection program for yield improvement of yard long bean.

Knowledge Management: Journal