Effect of generations and environments in the analysis of a partial diallel to improve bean earliness

Abstract

ABSTRACT. The objective of this study was to select genitors based on F 1 and F 2 generations, evaluated in different environments, to obtain segregating populations for the identification of strains showing improved earliness, yield, and carioca-type grains. Nine bean strains were crossed in a partial diallel scheme (4 x 5), in which group 1 included 4 strains with early cycles and group 2 included 5 elite strains. The F 1 and F 2 generations and the genitors were assessed in Coimbra and Viçosa in randomized blocks with 3 replications. The following characteristics were evaluated: days between sowing and emergence, and grain yield. We observed an interaction between the effects of general combining ability and specific combining ability with the environments (crop, location, and generation) for both grain earliness and yield. Genetic analysis of earliness revealed a predominance of additive effects and grain yield dominance effects. The strain Goiano Precoce may be used as a genitor in breeding programs to improve earliness, while strains RP1 and VC33 can be used to increase grain N.M. Vale et al. 8220©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 14 (3): 8219-8228 (2015) yield. We observed genetic complementation between strains Goiano Precoce and RP1, BRSMG Madrepérola and BRS Estilo for earliness and between RP1 and Rosinha Precoce for grain yield.

Alimentação Para Confinamento Bovino: Uma Revisão Sistemática

“…Na busca de novas cultivares, uma das etapas indispensáveis é a hibridação. Nesta etapa, a seleção adequada de genitores é essencial para obtenção de populações segregantes promissoras para o desenvolvimento de linhagens superiores (VALE et al, 2015). Quando diferentes critérios de seleção são considerados, a predição de ganhos para cada critério é importante para direcionar o melhorista na utilização do material genético disponível visando maximizar os ganhos para os caracteres de interesse (PAULA et al, 2002).…”

Selection for hypocotyl diameter results in genetic gain in common bean plant architecture

“…Thus, for hypocotyl diameter and plant architecture score, any inbreeding generation could be used, due to the predominance of additive effects in their genetic control. However, for grain yield, where the genetic control is predominated by dominance effects (Silva et al 2013b, Vale et al 2015, the F 4 generation would be more adequate for the methodology of Jinks and Pooni (1976). The reason is that this generation allows a considerable reduction in dominance effects in the control of the target trait for the prediction of the potential of segregating populations.…”