Abstract
A study was conducted to assess the extent of genetic variability, broad-sense heritability and correlations for fresh root weight, root number and top weight of five cassava genotypes across three locations in 2 years. Combined analysis of variance revealed highly significant genotypic effect for all the traits. Genotype x environment interaction was also significant for all the traits studied indicating considerable but, varying response of the genotypes to the environments. High broad-sense heritability and genetic advance as percent of the mean were observed for fresh root weight, suggesting that the trait is primarily under genetic control and that a simple recurrent phenotypic selection scheme would be rewarding. Phenotypic coefficients of variation values were larger than their corresponding genotypic coefficient of variation values for all traits. Correlations between the three traits were highly significant and positive indicating that simultaneous progress for the three traits is feasible.
Highlights
Cassava (Manihot esculenta Crantz) is a food security crop for most of the populations in the tropical regions of the world (Akinwale et al, 2010a)
Many of the economic traits of cassava are quantitatively inherited and are highly influenced by environmental conditions (Akinwale et al, 2010a). This necessitates partitioning of the overall variability into its heritable and non- heritable components with the use of suitable genetic parameters such as genotypic coefficient of variation, heritability estimates, genetic advance and phenotypic variances for traits (Table 2)
The objective of this paper is to evaluate the extent of genetic variability, heritability and advances of cassava fresh root weight, root number and top weight in three agro-ecological zones of Ghana
Summary
Cassava (Manihot esculenta Crantz) is a food security crop for most of the populations in the tropical regions of the world (Akinwale et al, 2010a). Many of the economic traits of cassava are quantitatively inherited and are highly influenced by environmental conditions (Akinwale et al, 2010a). This necessitates partitioning of the overall variability into its heritable and non- heritable components with the use of suitable genetic parameters such as genotypic coefficient of variation, heritability estimates, genetic advance and phenotypic variances for traits (Table 2). It serves as a predictive role in selection procedures (Allard, 1960). The objective of this paper is to evaluate the extent of genetic variability, heritability and advances of cassava fresh root weight, root number and top weight in three agro-ecological zones of Ghana
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