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Accession Characterization and Genetic Variability Studies in Colocasia Esculenta L. Schott

K. K. Pau
Institute of Biological Science, Rajshahi University, Rajshahi-6205, Bangladesh.

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

Abstract/ Executive Summary:

Accessions of Colocasia esculenta L. Schott. cultivars collected from thirteen aroid growing districts were studied for determining their genetic variability under the agromorphological purviews. Plant height, petiole length, petiole breadth, leaf number, leaf length, leaf breadth, LAI, inflorescence length, peduncle length, spathe length, spathe breadth, corm length, corm breadth, cormel number, cormel length, cormel breadth, corm weight, cormel weight, total fresh weight, total dry weight, yield per plant were taken in this study for nature and extent of variability analysis of edible cultivars of Colocasia esculenta L. Schott. Presence of significant differences together with wide ranges of variation in most cultivars indicates wide range of variability existed among the accession as well as local cultivars of this edible aroid. Genotypic variances and coefficient of variation for most of the characters were remarkably higher than their corresponding environmental variances which also indicate the existence of variation in genotypic origin.

Keywords: Characterization, Mukhikachu, Variability, Colocasia esculenta

Location: Rajshahi University

Start Date: 00-00-2005

End Date: 00-00-2008

Program Area: Variety and Species

Commodity: Aroids

Objectives:

To study the Accession Characterization and Genetic Variability Studies in Colocasia esculenta L. Schott

Methodology:

Plant materials: Colocasia esculenta L. Schott accessions were collected from different aroid growing areas such as such as Arani, Godagari and Meher chandi of Rajshahi, Tala of Satkhira, Churamonkati and Chougacha of Jessore, Santhahar of Bogra, Panchbibi of Joypurhat, Munshiganj and Joydebpur of Dhaka, Madhupur of Mymensingh and sadar upozilla of Barisal in Bangladesh from 2005-2006. Selected plantlets and plants parts (plantlets, corm, cormels and setts) were used for propagating materials. This investigation was conducted at the experimental farm of the Institute of Biological Sciences research field at Rajshahi University, Rajshahi during 2005-2008. The land in which the experiment was carried out was medium high. The soil was part of Level Barindagroecological zone marked by sandy loam with PH 6.5. All recommended agricultural practices were followed.

Experimental design: The experiment was set up in a Randomized Complete Block (RCB) design with three replications. In each experimental plot plant propagules were planted with row to row spacing 0.75 m and plant to plant spacing was 0.60 cm was maintained. The collected propagules are designated, districts with first three letters (dha=Dhaka) and number on basis of collected accessions. Two healthy propagules were planted per hill during plantation and finally a single healthy plant was maintained.

Data recording: The agro-morphological data of Plant height (PLH), Petiole length (PEL), Petiole breadth (PEB), Leaf length (LEL), Leaf breadth (LEB), Leaf Number (LEN), Corm length (CRL): Corm breadth (CRB), Cormel length (COL), Cormel breadth (COB), Cormel number (CON), Cormel weight (COW), Corm weight (CRW), Sucker number (SUN) and Yield per plant (YPP) were collected and recorded following descriptors of Taro with necessary modifications (IPGR I, 1999).

Statistical analysis: The collected data were analyzed following the biometrical techniques of analysis developed by Mather (1949) based on mathematical model of Fisher et al. (1932) using the SPSS and excel software. Mean and Critical differences were worked out by the method of analysis of variance used for randomized block design. The data analysis was done after Cochran and Cox, (1960). Critical differences were calculated to compare between any two means following Panse and Suhatme, (1978) and Singh and Chaudhary (1977). Coefficient of variability at phenotypic, genotypic and environmental levels were computed following Johnson et al. (1955) and Burton and De Vane (1953).

Source of Information: Bangladesh J. Sci. Ind. Res. 46(2), 235-242, 2011

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Presence of significant differences together with wide ranges of variation in most cultivars indicates wide range of variability existed among the accession as well as local cultivars of this edible aroid. Genotypic variances and coefficient of variation for most of the characters were remarkably higher than their corresponding environmental variances which also indicate the existence of variation in genotypic origin.

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