Abstract
ABSTRACT Evaluation of pre-commercial hybrids in a germplasm bank is essential for determining its commercial potential or its utility as a potential genitor in a breeding program. The objective of this study was to determine genetic divergence and per se behavior of 47 pre-commercial hybrids from okra germplasm bank of the Universidade Federal de Uberlândia. Precocity index (%), number of fruits (fruits per plant), average fruit mass (g) and productivity (g per plant) were evaluated. Analysis of genetic divergence was performed by multivariate analysis using Mahalanobis distance with different clustering methods (UPGMA and canonical analysis). The performance of hybrids was compared by Scott-Knott (p= 0.05). A significant genetic variability among okra hybrids was observed. UPGMA and canonical analysis grouped the hybrids similarly, being satisfactory to represent genetic divergence. Ten hybrids presented higher performance than the commercial hybrids. Among them, UFU-QB16 stood out as the most promising hybrid for being used as a potential parent in breeding programs after auto pollination.
Highlights
A avaliação de híbridos pré-comerciais em um banco de germoplasma é essencial para determinar seu potencial comercial ou sua utilidade como potenciais genitores em um programa de melhoramento
The development of more productive genotypes depends on the genetic variability available in germplasm banks (Koundinya et al, 2013)
The genetic material used consisted of 47 pre-commercial okra hybrids from 17 crossing inbred lines belonging to the germplasm bank of Universidade Federal de Uberlândia breeding program
Summary
A avaliação de híbridos pré-comerciais em um banco de germoplasma é essencial para determinar seu potencial comercial ou sua utilidade como potenciais genitores em um programa de melhoramento. O objetivo deste trabalho foi verificar a divergência genética e o comportamento per se de 47 híbridos pré-comerciais pertencentes ao banco de germoplasma de quiabeiro da Universidade Federal de Uberlândia. It is possible to select higher plants in new segregating populations from the crossbreeding between divergent parents and develop more productive cultivars or lineages for exploration of the heterosis (Kumar & Reddy, 2016b). In this context, the adequate choice of the parents for a crossbreeding is essential, and may determine the success or economic return of an okra breeding program. For quantitative traits the variability can be visualized with the use of dissimilarity measures like the generalized Mahalanobis distance , which considers the residual variances
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