This study aimed to improve the local okra cultivar (cv. Balady) by accessing superior earliness pure lines using an individual plant selection breeding program. Six cycles of individual plant selection were carried out at the Agricultural Experimental Station Farm at Abies region, Faculty of Agriculture, Alexandria University, Egypt, which resulted in ten pure lines with distinct horticultural traits. The selected pure lines were evaluated in the summer season of 2020 with the original population. The results showed that the pure lines L5 and L1 recorded significantly the lowest mean values compared to all the genotypes for the earliness traits, viz., days number to first flower and pod, as well as days number to 50% flowering, and days number to first harvest. Moreover, the selected pure lines significantly exceeded the original population in the characteristics of early and total yield per plant, and the three pure lines L4, L8, and L9 were the most distinguished for these traits. Concerning correlation estimates, the characteristics of earliness reflected positive and significant correlations between one another, as well as, with the characteristics plant height and early yield as the number of pods. The results of cluster analysis illustrated that the first group (I) was distinguished as being the earliest, while the third (III) and fourth (IV) clusters were the best for the productivity traits. So, it is recommended to use the pure lines L4, L8, and L9 to improve total and early yield as well as the earliness traits.
This study was conducted during six cycles of an individual plant selection program to obtain promising pure lines of okra; that possess a new uniform architecture with desirable traits, using two local cultivars of okra, Balady and Eskandirani. This was followed by an evaluation of the selected pure lines with the two base populations. So, this study was conducted during the seven successive summer seasons of 2014 to 2020, at the Experimental Station Farm (at Abies) of the Faculty of Agriculture, Alexandria University, Egypt. The obtained results revealed that in the two original populations, the estimated means, ranges, and coefficients of variations of all analyzed characteristics exhibited noticeable variation in vegetative growth, productivity, and pod quality. Also, positive performance was obtained in the selected pure lines, where they were characterized by short to medium plant height, broad stem diameter, no branches (zero-type plants), and short internodes, as well as a low position of nodes number to the first flower or pod. Regarding productivity and quality of pods, the results showed that the selected pure line L 15 showed significantly the highest mean values for the characteristics of pods number per plant, pods yield per plant, pods yield per square meter. Also, the seven pure lines L 14 , L 10 , L 12 , L 9 , L 8 , L 11 , and L 13 recorded significantly higher mean values than the Eskandirani cultivar for the same traits mentioned earlier; while the five pure lines L 3 , L 4 , L 5 L 6 , and L 7 did not reflect any statistically significant differences from the Eskandirani cultivar.
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