Author(s): RESENDE, R. M. S.; ASSIS, G. M. L. de; MONTAGNER, D. B.; FERREIRA, R. C. U.

Summary: Forage peanut improvement for use in grass-legume mixtures is expected to have a great impact on the sustainability of Brazilian livestock production. Eighteen cloned Arachis spp. ecotypes were evaluated under clipping in a Brazilian Cerrado region and results analysed using a mixed model methodology. The objective was to estimate genetic and phenotypic parameters and to select the best ecotypes based on selection index applied on their predicted genotypic value. The traits of total dry-matter (DM) and leaf DM yield presented moderate (0_30 < h2g < 0_50) to high (>0_50) broad-sense heritability, in contrast to the low genetic variability in nutritional quality-associated traits. Ecotypes of Arachis spp. contained average crude protein concentrations of 224 g kg _1 DM in leaves and 138 g kg _1 DM in stems, supporting the potential role of these species to overcome the low protein content in Cerrado pastures. The correlations between yield traits and traits associated with low nutritional value in leaves were consistently significant and positive. Genetic correlations among all the yield traits evaluated during the rainy or dry seasons were significant and positive. The ecotypes were ranked based on selection index. The next step is to validate long-term selection of grass?Arachis in combination with pastures under competition and adjusted grazing in the Cerrado region.

Publication year: 2016

Types of publication: Journal article

Unit: Embrapa Acre

Keywords: Acumulación de materia seca, Amendoim forrageiro, Arachis spp, Cerrado, Crop yield, Dry matter accumulation, Fitomejoramiento, Forage legumes, Forage peanut, Genetic variation, Heredabilidad, Hereditariedade, Heritability, Leguminosa forrageira, Leguminosas forrajeras, Matéria seca, Melhoramento genético vegetal, Nutritive value, Parâmetro genético, Pastagem, Pastizales, Pastures, Phenotypic variation, Plant breeding, Producción estacional, Produção sazonal, Rendimento, Rendimiento de los cultivos, Repeatability, Repetibilidad, Repetibilidade, Seasonal production, Seleção fenótipa, Valor Nutritivo, Valor nutricional, Variación fenotípica, Variación genética