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Estimativa de parametros genéticos sob duas estratégias de avalia??o em híbridos intra e interespecíficos de capim-elefante

DOI: 10.1590/S1516-35982010001200005

Keywords: correlation, genetic breeding, heritability, pennisetum glaucum, pennisetum purpureum, selection.

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Abstract:

the objective of this work was to evaluate the genetic parameters estimated in intra and interespecific hybrid families of elephant grass under two evaluation strategies: per se and genetically stratified mass selection. ten families of intraespecifc hybrids and ten families of interespecific hybrids were used. the characteristics evaluated were the following: plant height, plant agronomic score, dry matter content and dry matter production. it was estimated, for genetic parameters, heritability in the wide sense, variance, genetic and experimental variation coefficient and genetic, phenotypic and environmental correlation. the experiment was evaluated in a random block design with three repetitions. greater genetic variability for the studied characteristics were observed among the interespecific hybrids of elephant grass and pearl millet in comparison to the intraespecifc hybrids of elephant grass. heritability showed higher percentages for per se strategy among the studied hybrids. genetically stratified mass selection is less effective in removing the environmental effects aiming at improving experimental precision.

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