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Correlation and Path Coefficient Studies of Cocoyam (xanthosoma Sagittifolium L.)

K. K. Paul
Govt. shahid Bulbul College,Pabna-6600, Bangladesh.

M. A. Bari
Institute of Biological Sciences, Rajshahi University, Rajshahi-6205, Bangladesh.

Abstract/ Executive Summary:

Plant height, leaf length, leaf breadth, leaf number, leaf area index, corm length, corm breadth, corm weight, sucker number exhibited positive correlation with yield per plant in both genotypic and phenotypic level in cocoyam (Xanthosoma sagittifolium). Path coefficient analysis revealed that leaf length, leaf number, corm length exhibited direct influences to yield per plant. In genotypic level yield per plant showed the highest positive direct effect with corm length followed by cormel breadth, sucker number.

Keywords: Cocoyam, Correlation coefficients, Path coefficient, Xanthosoma sagittifolium

Location: Institute of Biological Sciences, Rajshahi University, Rajshahi

Start Date: 00-00-2006

End Date: 00-00-2008

Program Area: Variety and Species

Commodity: Yam

Objectives:

1. To estimate the genotypic and phenotypic correlation and direct and indirect effect among different characters for identification of best genotypes from cultivars of cocoyam towards tuber yield.

Methodology:

335 accessions of cocoyam (Xanthosoma sagittifoium) were collected from aroid growing districts namely Rajshahi, Satkhira, Jessore, Bogra, Joypurhat, Munshiganj, Dhaka, Mymensingh and Barisal in Bangladesh. Collected propagules are maintained at the experimental farm of the Institute of Biological sciences at University of Rajshahi,Rajshahi in 2006 - 2008. The accessions were grown in loamy soil in a single row of 4 meters length with inter row spacing of 75 cm. All recommended agricultural practices were followed for this crop production. The experiment was set up in a Randomized Complete Block (RCB) design with three replications. In each experimental plot twenty cocoyam accessions propagules were planted with plant to plant spacing of 0.75m and row to row spacing of 1m. When plant growth is very stunted, leaves become yellowish, dry and dropping then the quantitative parameters were observed and data were collected following descriptors of cocoyam with necessary modification. Data were recorded for plant height (PLH), Petiole length (PEL), petiole breadth (PEB) leaf length (LEL), leaf breadth (LEB), leaf number (LEN), leaf area Index (LAI),which was calculated by leaf length x leaf breadth x 0.75 (Montgomery, 1911), corm length (CRL), corm breadth (CRB), cormel length (COL), cormel breadth (COB), cormel number (CON), cormel weight (COW), corm weight (CRW), sucker number (SUN), total fresh weight (TFW) and yield per plant (YPP). The collected data were analyzed following the biometrical techniques of analysis developed by Mather based on a mathematical model using the SPSS and MS Excel Software. Mean and critical differences were worked out by the method of analysis of variance used for randomized block design. After collection of data, analysis was done separately for each character. The analysis of variance for each character under the study was performed by F Test. Phenotypic and genotypic correlation coefficient for all possible combinations was computed from the components of variance and covariance following AL-Jibouri and co-workers. The path coefficient analysis was done by using Wright’s formula was extended by Dewey and Lu.

Source of Information: Bangladesh J. Sci. Ind. Res. 50(1), 47-52, 2015

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The characters corm length, cormel breadth, sucker number, leaf number, leaf length can play the significant role for increasing yield per plant. These characters could be utilized by breeders as selection criteria to isolate higher yielding genotypes.

Knowledge Management: Journal