Genetic variability and heritability in cultivated okra [Abelmoschus esculentus (L.) Moench]

Abstract

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.Additional key words: accession; derived savannah; genetic advance; genotypic correlation; Nigeria; phenotype. Resumen Variabilidad y heredabilidad genética en quingombó [Abelmoschus esculentus (L.) Moench] cultivadoSe cultivaron 29 accesiones de quingombó de diferentes regiones agro-ecológicas en Nigeria durante las estaciones lluviosas y secas de 2006 y 2007 en Abeokuta (derivada de la sabana) y Ilishan (selva) y se evaluaron para determinar la variabilidad genética, heredabilidad y avance genético de ocho caracteres relacionados con el rendimiento. El experimento fue en bloques completos al azar con cinco repeticiones. Hubo un alto coeficiente de variabilidad genotípi-ca, % de heredabilidad en sentido amplio y avance genético en caracteres como altura de planta (26,2; 90,7; 51,5, respectivamente), longitud de vaina fresca (23,9; 98,5; 48,8), ancho de vaina fresca (23,9; 98,5; 48,8), longitud de vaina madura (28,6; 98,5; 52,3), ramas por planta (29,3; 82,3; 54,8) y peso de vaina por planta (33,9; 90,0; 63,3), lo que sugiere un efecto aditivo de genes y fiabilidad de selección basada en el fenotipo de estos caracteres para mejorar los cultivos. La correlación positiva y significativa, fenotípica y genotípica entre la altura de la planta en la madurez, el ancho de la vaina fresca, las semillas por vaina, las vainas por planta y las ramas por planta, con el peso de las semillas por planta y el peso de las vainas por planta, sugiere que la selección en el quingombó basada en el fenotipo de estos caracteres conducirá a un alto rendimiento en semillas y vainas.

Genetic relationships among okra (Abelmoschus esculentus (L.) Moench) cultivars in Nigeria

“…It shows that the genetic parameters of the parental materials were quite dissimilar. This result corroborates with that of several earlier researchers (Akinyele & Osekita, 2006;Nwangburuka et al, 2011;Nwangburuka et al, 2012;AdeOluwa & Kehinde, 2013;Muluken et al, 2016). Again, the cultivars exhibited significant (P<0.05) differences for fresh capsule yield per plant and the number of capsules per plant.…”

“…This variation could be used via selection to improve the okra studied characters. This result is supported by several previous researchers (Düzyaman, 2005;Salesh et al, 2010;Nwangburuka et al, 2012;Hazem et al, 2013;Amoatey et al, 2015). The first-order cultivar × year interaction was significant for all the okra characters.…”

Genetic Variability, Heritability and Genetic Advance for Seed Yield and its Components in Roselle (Hibiscus sabdariffa L.) in North Coastal Zone of Andhra Pradesh, India

“…Hence, phenotypic selection may not hold good for genetic improvement in these traits. These findings are in agreement with Dastidar et al, (1993), Islam et al, (2002), Palve et al, (2003), Echekwu and Showemino (2004), Ibrahim and Hussein (2006), Ghodke and Wadikar (2011);Nwangburuka et al, (2012) and Ibrahim et al, (2013 Similar results were also reported by Dastidar et al, (1993), Mostofa et al, (2002), Echekwu and Showemino (2004), Ghodke and Wadikar (2011);Nwangburuka et al, (2012) and Ibrahim et al, (2013 High heritability coupled with high genetic advance of mean was observed for the traits plant height, pods plant -1 and seed yield plant -1 in both the years. These findings were corroborated with the results of Dastidar et al, (1993), Islam et al, (2002), Ghodke and Wadikar (2011);Nwangburuka et al, (2012) and Ibrahim et al, (2013).…”

“…These findings are in agreement with Dastidar et al, (1993), Islam et al, (2002), Palve et al, (2003), Echekwu and Showemino (2004), Ibrahim and Hussein (2006), Ghodke and Wadikar (2011);Nwangburuka et al, (2012) and Ibrahim et al, (2013 Similar results were also reported by Dastidar et al, (1993), Mostofa et al, (2002), Echekwu and Showemino (2004), Ghodke and Wadikar (2011);Nwangburuka et al, (2012) and Ibrahim et al, (2013 High heritability coupled with high genetic advance of mean was observed for the traits plant height, pods plant -1 and seed yield plant -1 in both the years. These findings were corroborated with the results of Dastidar et al, (1993), Islam et al, (2002), Ghodke and Wadikar (2011);Nwangburuka et al, (2012) and Ibrahim et al, (2013). High heritability coupled with high genetic advance as percent of mean for plant height, pods plant -1 and seed yield plant -1 indicates the operation of additive genes and offer the best possibility for improvement of this trait through mass selection, progeny selection, family selection to any other suitable modified selection procedure aiming to exploit the additive gene effects Bhakuni (Bhakuni Vandana) (Vandana et al, 2017).…”

Phenotypic Evaluation of Heritability, Agro-Morphological and Yield Characters of Sixteen <i>Amaranthus</i> Linn. Genotypes

“…This is in accordance with the reports of Nwangburuka et al (2012) and Olawuyi et al (2014) who considered genetic variability as essential in crop breeding. The genotypic effect also had significant expression on the traits evaluated in Amaranthus.…”