Revista Ciência Agronômica (Jun 2012)
Produção forrageira e composição bromatológica de combinações genômicas de capim-elefante e milheto Fodder production and bromatological composition of genomic combinations in elephant grass and pearl millet
Abstract
Objetivou-se com este trabalho, avaliar o comportamento agronômico de combinações genômicas oriundas do cruzamento entre capim-elefante (Pennisetum purpureum Schum.) e milheto (Pennisetum glaucum (E.) Leek), visando determinar o potencial de Pennisetum glaucum para o melhoramento da qualidade forrageira do capim-elefante. Três cultivares de capim-elefante e 11 combinações genômicas foram avaliadas para produção de matéria verde total (PMV), produção de matéria seca total (PMS), percentagem de matéria seca (%MS), produção de matéria seca de folhas (PMSF), produção de matéria seca de caule (PMSC), relação caule/folha (RFC), altura (ALT), vigor fenotípico (VF), número de perfilhos (NP), fibra em detergente ácido (FDA), fibra em detergente neutro (FDN), proteína bruta (PB) e digestibilidade in vitro de matéria seca (DIVMS). Excetuando RFC e NP, todas as demais características apresentaram diferenças significativas para os genótipos (p The objective of this work was to evaluate the agronomic performance of genomic combinations from elephant grass (Pennisetum purpureum Schum.) and pearl millet (Pennisetum glaucum (E.) Leek), in order to determine the Pennisetum glaucum potencial as a germoplasm for elephant grass improvement. Three cultivars and eleven genomic combinations were evaluated for fresh forage production (PMV), total dry matter production (PMS), dry matter ratio (%MS), leaves dry matter production (PMSF), stem dry matter production (PMSC), leaf/stem ratio (RFC), height (ALT), plant vigor (VF), number of tillers (NP), acid detergent fiber ratio (FDA), Neutral detergent fiber ratio (FDN), crude protein ratio (PB) and in vitro dry matter digestibility (DIVMS). All characteristics, except for RFC and NP, showed significant difference for genotypes (p < 0.05), point out to the genetic variability among the evaluated genotypes. As to forage dry matter production, the HCM-5x-2 genomic combination outstood the pentaploids while the HCM-4x-2 outstood the tetraployds. The improvement of forage quality in Pennisetum through the introgression of favorable traits to the millet was enhanced by the improvement of genomic pentaploids combinations peformance for bromatologic traits, what showed their potential for being included in genetic breeding programs.
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