Title:	Epistasis in intra- and inter-gene pool crosses of the common bean.
Authors:	BOREL, J. C. RAMALHO, M. A. P. ABREU, A. F. B.
Affiliation:	J. C. BOREL, UNIVERSIDADE FEDERAL DO VALE DO SÃO FRANCISCO, Petrolina-PE; MAGNO ANTONIO PATTO RAMALHO, UFLA; ANGELA DE FATIMA BARBOSA ABREU, CNPAF.
Date Issued:	2016
Citation:	Genetics and Molecular Research, v. 15, n. 1, gmr15017573, Feb. 2016.
Description:	Epistasis has been shown to have an important role in the genetic control of several quantitative traits in the common bean. This study aimed to investigate the occurrence of epistasis in intra-and inter-pool gene crosses of the common bean. Four elite lines adapted to Brazilian conditions were used as parents, two from the Andean gene pool (ESAL 686; BRS Radiante) and two from the Mesoamerican gene pool (BRSMG Majestoso; BRS Valente). Four F-2 populations were obtained: "A" (ESAL 686 x BRS Radiante), "B" (BRSMG Majestoso x BRS Valente), "C" (BRS Radiante x BRSMG Majestoso), and "D" (BRS Valente x ESAL 686). A random sample of F2 plants from each population was backcrossed to parents and F-1 individuals, according to the triple test cross. Three types of progenies from each population were evaluated in contiguous trials. Seed yield and 100-seed weight were evaluated. Dominance genetic variance was predominant in most cases. However, the estimates of genetic variance may be biased by the occurrence of linkage disequilibrium and epistasis. Epistasis was detected for both traits; however, the occurrence differed among the populations and between the two traits. The results of this study reinforce the hypothesis that epistasis is present in the genetic control of traits in the common bean and suggest that the phenomenon is more frequent in inter-gene pool crosses than in intra-gene pool crosses.
Thesagro:	Feijão Phaseolus vulgaris Melhoramento genético vegetal
NAL Thesaurus:	Beans Outbreeding depression Plant breeding
Keywords:	Triple test cross
ISSN:	1676-5680
DOI:	10.4238/gmr.15017573
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPAF)