Escolha de genitores quanto à precocidade e produtividade de feijão tipo carioca

Abstract

Resumo -O objetivo deste trabalho foi avaliar linhagens de feijoeiro promissoras para a seleção de genitores com características de feijão tipo carioca, precoces e de alto potencial produtivo. Avaliaram-se 35 linhagens de feijoeiro, em delineamento de blocos ao acaso com três repetições. Quatro destas linhagens -Goiano Precoce, XAN112, Carioca1070 e Rosinha Precoce -foram selecionadas para compor o grupo 1 do dialelo parcial 4×5, e três -RP1, VC15 e VC33, de ciclo normal, grãos tipo carioca e elevado potencial produtivo -foram utilizadas para compor o grupo 2 do dialelo, juntamente com as cultivares BRSMG Madrepérola e BRS Estilo. Obtiveram-se 20 híbridos que, com seus genitores, foram avaliados na safra da seca de 2013, em Coimbra e Viçosa, MG, em delineamento de blocos ao acaso, com três repetições. A linhagem Goiano Precoce destacouse quanto à precocidade, com valores de capacidade geral de combinação (CGC) negativos e significativos em Viçosa (-3,15) e Coimbra (-3,44). A linhagem RP1 destacou-se quanto ao rendimento de grãos, com valores positivos e significativos de CGC em Viçosa (115) e Coimbra (260). Com base na CGC, a linhagem Goiano Precoce é promissora para utilização como genitora quanto à precocidade, e a RP1, quanto ao aumento no rendimento de grãos.Termos para indexação: Phaseolus vulgaris, análise dialélica, dialelo parcial. Choice of parents for earliness and yield of carioca-type beanAbstract -The objective of this work was to evaluate promising bean lines for the selection of parents, with carioca grain-type traits, early, and with high productive potential. Thirty-five common bean lines were evaluated in a randomized complete block design with three replicates. Four of these lines -Goiano Precoce, XAN112, Carioca1070, and Rosinha Precoce -were used to compose the group 1 of a 4×5 partial diallel, and three -RP1, VC15 e VC33, of normal cycle and carioca grain type with high yield potential -were used to compose the group 2 of the diallel, together with the cultivars BRSMG Mandrepérola and BRS Estilo. Twenty hybrids were obtained, which were evaluated with their parents in the dry season of 2013, in Coimbra and Viçosa, in the state of Minas Gerais, Brazil, in a randomized complete block design with three replicates. Goiano Precoce line stood out for earliness with negative and significant values of general combining ability (GCA), in Viçosa (-3.15) and Coimbra (-3.44). RP1 line stood out for grain yield with positive and significant GCA values, in Viçosa (115) and Coimbra (260). Based on the GCA, Goiano Precoce is a promising line to be used as a parent for earliness, and RP1 for grain yield increase.

Diallel analysis to choose parents for black bean (Phaseolus vulgaris L.) breeding

“…These results suggest that the genes involved in the genetic control of YIELD are expressed differently in different seasons. Some previous studies have reported the predominance of additive effects (Kurek et al, 2001;Mendes et al, 2009), while others have reported a greater importance of dominance effects Vale et al, 2015) in the genetic control of bean yield.…”

Research Article Selection of parents and segregating populations of black bean resistant to fusarium wilt with high yield and seed weight

“…One of the methods of diallel cross analysis is that presented by Griffing (1956), through which the effects of general combining ability and specific combining ability are estimated (Ramalho et al, 2005). This type of analysis has been used for various traits in common bean, such as seed yield (Mendes et al, 2009), early maturity (Vale et al, 2015), reaction to fusarium wilt (Batista et al, 2016), reaction to white mold (Ferreira et al, 2018), and drought tolerance (Gonçalves et al, 2015), among others. However, reports of its use for reaction to fusarium wilt in field conditions were not found.…”

Research Article Genetic control and selection of common bean parents and superior segregant populations based on high iron and zinc contents, seed yield and 100-seed weight

“…Methods for selecting parents may involve only information from the parents, such as those using their own mean of the trait or genetic divergence or using progeny performance. Among these, diallel crosses have been widely used in common bean breeding for various traits (Machado et al, 2002;Pereira et al, 2007;Silva et al, 2013;Mukamuhirwa et al, 2015;Vale et al, 2015).…”