Genotypic performance, character correlations and path analysis of pod yield in Abelmoschus caillei (A. Chev.) Stevels

Abstract

Direct selection based on pod yield is often a problem in West African okra (<em>Abelmoschus caillei</em> (A. Chev.) Stevels) breeding programs. Information on inter-relationships among traits to implement indirect selection for pod yield is needed. Objectives of this study were to evaluate the performance of West African okra varieties in two cropping seasons prevailing in Nigeria, and to determine the associations among main agronomic characters and their influence on pod yield. Twenty-five genotypes were grown in two planting seasons at the Research Farm of the Federal University of Agriculture, Abeokuta in 2008-2009 using a randomized complete-block design with three replications. Sixteen plant characters were measured. The data were subjected to variance, correlation and path analyses. Four genotypes, viz., CEN 010, CEN 012, NGAE-96-04 and AGA 97/066-5780 demonstrated potential for high pod yield. CEN 012 and AGA 97/066-5780 in addition, demonstrated early flowering higher number of pods. Character associations varied between planting seasons. The dependence of pod yield on final plant height, number of branches per plant, number of pods per branch, number of pods per plant, number of ridges per pod, weight of 250 seeds, pod length and seed weight per plant was noted in both planting seasons. In both seasons, number of pods per plant exhibited a high positive direct effect on pod yield. In conclusion, the trait of most interest for improving pod yield under early and late-season conditions was number of pods per plant

Studies of factors effecting an improvement of seed production and seed quality in okra, seed hardness and methods of overcoming this problem

“…Ariyo (1987) evaluated sowing 15 okra genotypes in 5 different environments and found a significant environmental effect on plant height and performance. Similarly, in a study of 25 genotypes in West Africa, the season of planting was found to have a positive effect on pod yield via its influence on plant height, the number of branches and pod number (Alake et al, 2012), a result supported by Adetunji and Chheda (1989), Franco and Ortegn (1997) and Singh et al (1986). Apart from its effect on plant growth, sowing time may also affect seed quality because this characteristic is highly dependent on the climatic conditions during seed maturation.…”

“…In most cases, however, sowing times differed greatly (e.g. different seasons) (Alake et al, 2012;Adetunji and Chheda, 1989;Franco and Ortega, 1997;Singh et al, 1986), whereas here the sowing times were only 20 days apart.…”