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Correlation and Path Coefficient Studies for Plant Characters in Aqua Aroids, Colocasia Esculenta L. Schott

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

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

S. C. Debnath
Atlantic Cool Climate Crop Research Centre, Agriculture and Agri-Food Canada, P.O. Box 39088, 308 Brookfield Road, NL A1E 5Y7, Canada

Abstract/ Executive Summary:

The nature and extent of correlation and path coefficients of aqua edible aroid taro (Colocasia esculenta L., Panikachu) accessions were studied for plant height, petiole length, petiole breadth, leaf number, leaf length, leaf breadth, leaf area index, inflorescence length, peduncle length, spath length, spath breadth and yield per plant. The yield per plant showed significant and positive phenotypic correlation with petiole length (0.481), leaf length (0.576), leaf breadth (0.918), leaf number (0.620), inflorescence length (0.662), spath length (0.890) and spath breadth (0.992). The residual effect was 0.2205 which indicated that characters studied contributed 78% of yield per plant. At genotypic level, yield per plant expressed positive and significant correlation with plant height (0.560) and leaf number (0.600). The residual effect (0.424) indicated that about 58% yield was contributed by these characters.

Keywords: Genotypic correlation; Phenotypic correlation; Path coefficient; Aqua aroid; Panikachu (Colocasia esculenta L Schott.stoloniferous).

Location: Rajshahi, Satkhira, Jessore, Bogra, Joypurhat, Munshiganj and Joydebpur of Dhaka, Mymensingh and Barisal in Bangladesh

Start Date: 00-00-2005

End Date: 00-00-2006

Program Area: Variety and Species

Commodity: Aroids

Objectives:

To find out and establish suitable selection criteria for higher tuber yield through study of relationship between yield and yield components in aqua edible aroids.

Methodology:

Edible aroids accessions were collected from different aroid growing pockets in the country, such as Rajshahi, Satkhira, Jessore, Bogra, Joypurhat, Munshiganj and Joydebpur of Dhaka, Mymensingh and Barisal in Bangladesh. Collected 485 accessions are being maintained at the experimental farm of the Institute of Biological Sciences in 2005-2006 at Rajshahi University, Rajshahi-6205 during onset of rainy season. All recommended agricultural practices were followed. The experiment was set up in a randomized complete block (RCB) design with three replications. In each experimental plot accessions were planted with row to row spacing 0.75 m and plant to plant spacing was 0.60m. The plantlets were sown in March, 2006. Two healthy accessions were planted per hill during plantation and finally a single healthy plant was maintained. When the vegetative growth is in climax the agro-morphological data were collected. When plant and vegetative growth is very stunted, leaves become yellowish, dry and dropping the quantitative parameters were observed and the data on plant height (PLH), petiole length (PEL), petiole breadth (PEB), leaf length (LEL), leaf breadth (LEB), leaf number (LEN), leaf area index (LAI), inflorescence length (IFL), peduncle length (PDL), spath length (SPL), spath breadth (SPB) and yield per plant (YPP) were recorded following descriptors of taro with necessary modifications. The collected data were analyzed following the biometrical techniques of analysis [4] based on mathematical model and using the SPSS and MS Excel software. Mean and critical differences were worked out and the analysis of variance for each character under study was performed by F Test. The critical differences were calculated to compare between any two mean values. Genotypic variance (σ2g), phenotypic variance (σ2p), and environment variance (σ2e) and covariance were estimated following the methods as described by Singh and Chaudhary. The path coefficient analysis was done by using formula was extended by solving a set of simultaneous equations.

Source of Information: J. Sci. Res. 3 (1), 169-176 (2011)

Article Link (Online Journal): http://www.banglajol.info/index.php/JSR/article/view/6078/5168

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Plant height showed positive direct effect (0.5964) on yield per plant. Positive and indirect effects were noticed through leaf breadth (0.1488) on yield per plant. The direct effect of petiole breadth on yield per plant was high (0.8868). Leaf length showed positive and direct effect on yield per plant (0.1884). Positive and indirect effects were found through plant height (0.1055), leaf breadth (0.2493), leaf area index (0.2873) and inflorescence number (0.1052). Leaf breadth exhibited high and positive direct effect on yield per plant (0.3666). It showed indirect and positive effects through plant height (0.2421), leaf length (0.1281), leaf area index (0.2700). Leaf number also exhibited indirect and positive effects through plant height (0.1926), leaf length (1263), leaf breadth (0.2346), leaf area index (0.5606) and inflorescence number (0.2363). Leaf area index showed positive and direct effect on yield per plant (0.5095). It also exhibited positive and indirect effect through plant height (0.1037), leaf length (0.1063), leaf breadth (0.1943), leaf number (0.2697). Inflorescence number showed positive direct effect on yield per plant (0.2670). It also exhibited positive and indirect effects via plant height (0.1926), leaf breadth (0.1085), leaf number (0.0254), leaf area index (0.1162). In genotypic level relatively moderate to high direct effects were expressed by petiole breadth followed by plant height, LAI, leaf breath. Leaf number showed indirect effect via LAI toward yield per plant. The residual effect 0.2205 indicated that the characters studied contributed 78 % of the yield. In Panikachu, plant height, leaf length, leaf breadth, leaf number and LAI showed positive correlation with yield per plant of which leaf length, leaf breadth and leaf number showed significantly positive correlation with yield per plant in both genotypic and phenotypic level. Correlation study showed the wide spectrum of relationship in respect of yield per plant and the characters themselves. In genotypic level plant height, petiole breadth, LAI had relatively high direct effect than other characters but in phenotypic level plant height, petiole length, leaf length and leaf breadth play a significant role for increasing the yield per plant as well as important for selection. Residual effect in both cases indicates that there is a positive chance for selection for cultivars development.

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