Department of Plant Breeding & Seed Technology

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    Genetic variability and heritability in cultivated okra [Abelmoschus esculentus (L.) Moench]
    (Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria (INIA), 1970-01-01) C. C. Nwangburuka; O. A. Denton; O. B. Kehinde; D. K. Ojo; A. R. Popoola
    Twenty-nine okra accessions from different agro-ecological regions in Nigeria were grown during the rainy and dry seasons, between 2006 and 2007 at Abeokuta (derived savanah) and Ilishan (rainforest) and assessed to determine their genetic variability, heritability and genetic advance from eight yield related characters. The experiment was laid out in a Randomized Complete Block Design with five replications. There was high genotypic coefficient of variability,% broad-sense heritability and genetic advance in traits such as plant height (26.2, 90.7, 51.5), fresh pod length (23.9, 98.5, 48.8), fresh pod width (23.9, 98.5, 48.8), mature pod length (28.6, 98.5, 52.3), branching per plant (29.3, 82.3, 54.8) and pod weight per plant (33.9, 90.0, 63.3), suggesting the effect of additive genes and reliability of selection based on phenotype of these traits for crop improvement. The positive and significant phenotypic and genotypic correlation between plant height at maturity, fresh pod width, seeds per pod and pods per plant, branches per plant with seed weight per plant and pod weight per plant, suggests that selection on the basis of the phenotype of these characters will lead to high seed and pod yield in okra.
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    Genetic variability studies in West African okra (Abelmoschus caillei)
    (Science Hub, 2011-10) O. AdeOluwa; O. Kehinde
    A collection of 35 accessions of West African Okra (Abelmoschus caillei) were evaluated for variability in 20 morphological and agronomic traits (qualitative and quantitative traits). Genotypic and phenotypic variances, genotypic (GCV) and phenotypic coefficients of variation (PCV), heritability, genetic advance of the characters were calculated. The accessions demonstrated wide variability for all characters evaluated. Variation was expressed in all qualitative traits studies except in leaf and petal colour. Phenotypic variances were generally higher than their respective genotypic variances thus revealing the role of environmental factors. High PCV and High GCV were observed for pod yield per plant and peduncle length, respectively. Very low heritability estimate was observed for number of ridges per fruit (7.1%). Moderately high heritability estimate (78.99%) was observed for peduncle length; moderately high PCV and GCV 35.71% and 31.74%, respectively but low genetic advance of 1.99%.