Potencial genético de genitores de cana-de-açúcar com base em cruzamentos biparentais
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2013-08-28
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Universidade Federal de Goiás
Resumo
An adequate choice of genitors to be crossed to generate genetic variability is essential to
increase the efficiency of sugarcane breeding program. The combining ability of genotypes in
crosses constitutes a good measure of genetic potential in future crosses. The aim of this
study was to evaluate the genetic potential of sugarcane genotypes based on biparental
crosses of sugarcane breeding programs from the Interuniversity Network for the
Development of Sugarcane Trade (PMGCA / RIDESA). The basic variable used was the rate of
selection of each cross population (full sib family) in the initial phase of the program (T1),
resulting from the selection practiced evaluating variables of primary importance for the
species. The average selection rate of each family was predicted using BLUP methodology.
Data analysis was performed using Method IV proposed by Griffing (1956), adapted to the set
of crosses available, detailing the effects of General Combining Ability (GCA) and Specific
Combining Ability (SCA). The predicted effects of SCA were correlated with genetic similarity
estimates obtained using the Dice coefficient from SSR markers and the Malécot coancestry
coefficient. It was detected significant effects of GCA, showing the possibility of selection of
parents based on this parameter. Although not statistically tested, SCA showed determination
coefficient higher than CGC. The genetic similarity obtained by coancestry coefficient showed
a significant correlation with SCA, although of low magnitude. There was no significance for
the correlation between genetic distance based on SSR marker and SCA. It was concluded
that the rate of selection is efficient to select potentially promising parents in the first stage of
selection in sugarcane.
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SANTANA, P. N. Potencial genético de genitores de cana-de-açúcar com base em cruzamentos biparentais. 2013. 67 f. Dissertação (Mestrado em Genética e Melhoramento de Plantas) - Universidade Federal de Goiás, Goiânia, 2013.