ISHS Acta Horticulturae 579: II Balkan Symposium on Vegetables and Potatoes
DIFFERENT APPROACHES OF THE IMPROVEMENT PROCESS IN SOME LOCAL OKRA VARIETIES |
| Authors: | E. Düzyaman, H. Vural |
| Keywords: | okra, genetic variability, data reduction, cluster analysis, diallel analysis |
| Abstract:
Eighteen selected okra genotypes of American, Indian, West African and Turkish origin were evaluated in the studies carried out in 1995 and 1997, including a diallel hybridisation in 1996. A data matrix was prepared of 15 morphological and agronomical plant characters of interest, and subjected to ‘Principal Component’ analysis for proper data reduction. 'Average Linkage Cluster Analysis’ was then applied, and an eco-geographic specific clustering pattern among genotypes could be established: The similarities between Turkish and West African okras, approved that Turkish okras originated from that continent. Since Indian genotypes were classified as the most differing okra types from the Turkish okras, Indian germplasm was thought to be promising in serving as a new tool in the improvement of local okras. Based on the results of cluster analysis, a hybridisation process in a diallel manner was undertaken by including the most diverse genotypes. Heterotic effects over better parent were especially observed in hybrids between inter-clustering genotypes, such as between Indian, USA or Turkish genotypes. More evidence on the origin of Turkish okras was obtaind from a hybrid between a West African and a Turkish okra parent, which produced fruits completely similar to another Turkish okra genotype. | |
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