Estudo comparativo do potencial agronômico entre progênies f4 de feijão- caupi de inflorescências simples e composta

• Autor(a) principal: BARROS, Fábio Ribeiro
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRPE
• Texto Completo: http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6280
• topic: Vigna unguiculata; Produtividade; Inflorescência composta; Productivity; Composed inflorescence; FITOTECNIA::MELHORAMENTO VEGETAL

The objective of this work was to compare the agronomic potential among progenies F4 of cowpea of simple inflorescences and composite, aiming increase productivity in commercial cultivars of cowpea, by selecting progeny with composite inflorescence. The genetic material included three parental genotypes (P1: TVx5058-09CE, P2: AU94-MOB-816 AND P3: Cacheado Roxo) and 68 progeny F4 of cowpea segregantes for the types of simple and composed inflorescence, and from these, thirty four progeny F4 resulted of RC1 obtained starting from the crossing of F1:3 x P1 and 34 were originating from of RC2, obtained starting from the crossing of F2:3 x P2. The experiment was conducted in Embrapa Mid-North experimental field, in Teresina (PI), in the year of 2008. Of each progeny F4 was advanced with two progeny, being one of simple inflorescence and other composite. used randomized block design with subdivided plots and four repetitions. The experimental portion was represented by ten plants and the subplot (inflorescences) for five plants. The components of variances were estimated for the method of maxim restricted verisimilitude with random effect of progeny. The genetic values (progeny and inflorescências/ progeny) and environmental they were predicted by the best linear unbiased predictor-BLUP. The estimates of genetic and environmental variances were significant for all of the characters in study. The estimates BLUP among progeny of RC1 showed that it happened larger number of genotypes with BLUP (-) for the characters pod lengt (COMPV), number of grains per pod (NGV), number of stems with pods (NPCV), weight of 100 grains (P100G) and production of grains (PG) and greater number of genotypes with BULP(+) for index of grains (IG) and same number of genotypes with BLUP (-) and (+) for the characteristic peduncle length (COMPP);already for RC2 only the number of grains per pod (NGV), weight of 100 grains (P100G) and index of grains (IG), presented estimates BLUP (-) and (+) balanced in terms of number of progeny, and the other characters showed more number of progeny with BLUP (+). To estimate BLUP the progeny for inflorescence type, was observed more number progeny with estimates BLUP (-) for all of the characters and retrocruzamentos, however, among the estimates BLUP (+), most of the progeny was of the type of composed inflorescence. The inflorescence progeny composed with positive BLUP for the production of grains (PG) and negative for peduncle length (COMPP) present a higher genetic potential for obtaining superior strains lineages, in relation to the characters in study, relatively to the progeny of simple inflorescence.