Caracterização de linhagens de feijoeiro do banco e germoplasma da Universidade Federal de Lavras.

A Universidade Federal de Lavras possui um Banco de Germoplasma de feijão com quase 1000 linhagens. Devido a falta de informações sobre esses acessos está sendo realizada a caracterização das linhagens desse banco. Nesse trabalho foram caracterizadas 142 linhagens quanto ao ciclo, hábito de crescimento, cor e tamanho dos grãos e resistência à algumas raças de antracnose. Verificou-se grande variabilidade entre elas. Os resultados obtidos serão utilizados na geração de um banco de dados que poderá ser utilizado pelos melhoristas de acordo com seus interesses

Seleção de híbridos de Brachiaria humidicola em diferentes épocas.

Comissão organizadora: Grácia Maria Soares Rosinha, Alexandra Rocha de Oliveir, Rodrigo Carvalho Alva

Evaluating early selection in perennial tropical forages.

Perennial grass hybrids of Urochloa are evaluated for at least two years during the screening stage trials (SS) and advanced trials (AD) in breeding programs, an expensive and time-consuming process. In this study, we aimed to evaluate the potential for early selection of cultivars in this breeding scheme. We used multiple measurements of agronomic and nutritive value traits of Urochloa humidicola and Urochloa decumbens in the SS, and Urochloa ssp. in the AD. Repeatability coefficient, genetic correlation, selection efficiency (SE), and Spearman correlations were estimated. The results indicated that reliable early selection could be applied, decreasing the evaluation period to one year and a half for SS, and to one year for AD. These results were confirmed by high genetic and rank correlations, and overall SE above 50%. This proposed change in the breeding scheme could save considerable time, labor, and resources and accelerate the release of improved cultivars

Evaluating early selection in perennial tropical forages.

Perennial grass hybrids of Urochloa are evaluated for at least two years during the screening stage trials (SS) and advanced trials (AD) in breeding programs, an expensive and time-consuming process. In this study, we aimed to evaluate the potential for early selection of cultivars in this breeding scheme. We used multiple measurements of agronomic and nutritive value traits of Urochloa humidicola and Urochloa decumbens in the SS, and Urochloa ssp. in the AD. Repeatability coefficient, genetic correlation, selection efficiency (SE), and Spearman correlations were estimated. The results indicated that reliable early selection could be applied, decreasing the evaluation period to one year and a half for SS, and to one year for AD. These results were confirmed by high genetic and rank correlations, and overall SE above 50%. This proposed change in the breeding scheme could save considerable time, labor, and resources and accelerate the release of improved cultivars.Made available in DSpace on 2019-12-27T18:15:40Z (GMT). No. of bitstreams: 1 Evaluatingearlyselectioninperennialtropicalforages.pdf: 440642 bytes, checksum: bee96446e56a21634ae598716a81207a (MD5) Previous issue date: 2019bitstream/item/207878/1/Evaluating-early-selection-in-perennial-tropical-forages.pd