Abstract
The study sought to assess combining ability and establish the gene action involved in the inheritance and heritability of yield and yield components in taro. Five (5) parents and twenty (20) F1 hybrids generated from hybridization were evaluated in 3 locations in Ghana. The field trials were laid in RCBD with three replications. Data measured included number of stolons, number of suckers, corm length (mm), corm width (mm), corm weight (g), yield (kg/ha) and dry matter content. Analysis of variance (ANOVA) was conducted using Statistical Tool for Agricultural Research version 2.0.1. Griffing Method II, Model 1 diallel analysis was used to estimate the general and specific combining ability. Heterosis was estimated for all the F1 hybrids. Heritability and correlation among the traits was also estimated. The ANOVA revealed significant differences among the genotypes for yield and its components. The high magnitude of SCA over GCA, high broad sense heritability over narrow sense heritability and below unity Bakers ratio observed for most of the yield traits studied indicates the predominance of non-additive gene action in the expression of the traits. The highly significant positive heterosis and above parental means recorded for the progenies indicates that effective progress can be made in the development of high yielding varieties of taro. CE/IND/16 which recorded significant positive GCA for all the traits except for number of stolons can be included in hybridization programs for varietal development in taro. Hybrids: CE/MAL/32 \(\times \) KAO19, KAO19 \(\times \) CE/IND/16, CE/IND/16 \(\times \) KAO19 and CE/IND/16 \(\times \) BL/SM/10 which had high hybrid vigor across the research environments could be further evaluated in other environments to ascertain their potentials for release to farmers for cultivation. Significant positive association observed between corm weight and yield/ha(kg) and corm width (mm), indicates that breeding for high corm weight and corm width will definitely improve the yield of taro.
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Donkor, E.F., Nyadanu, D., Akromah, R. et al. Genetic control and assessment of breeding value of selected exotic and local genotypes of taro (Colocasia esculenta) for yield and yield components. Euphytica 217, 92 (2021). https://doi.org/10.1007/s10681-021-02828-6
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DOI: https://doi.org/10.1007/s10681-021-02828-6