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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Parâmetros genéticos da concentração de ferro e de zinco em sementes de feijão andino / Genetic parameters of the iron and zinc concentrations in andean bean seeds

Zemolin, Allan Emanoel Mezzomo 23 February 2015 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The aim of this work was to investigate if occurs maternal effect for iron and zinc concentrations in Andean bean seeds, to obtain genetic parameters estimates for these minerals, and to select recombinants for the bean biofortification program. For this, crosses were performed between the parents IAC Boreal x Light Red Kidney, and Ouro Branco x Light Red Kidney, to produce F1, F1 reciprocal, F2, F2 reciprocal and backcrossed RC11 (F1 x P1) and RC12 (F1 x P2) generations. Parents and the other generations obtained were evaluated at a field experiment conducted at 2014 dry season, in Santa Maria, RS. In the bean seeds of the segregating populations obtained, the iron concentration range from 24.70 to 102.40 mg kg-1 of dry matter DM and the seed zinc concentration range from 10.70 to 37.50 mg kg-1 of DM, without that the expression of maternal effect was observed. The broad-sense heritability estimates for the seed iron concentration in the Andean beans range from 52.36 to 67.83%, and for zinc, the range was from 63.36 to 72.22%. The narrow-sense heritability estimates for seed iron concentration ranged from 19.04 to 45.29%, and, for zinc, from 31.04 to 63.60%. The selection gains for the seed iron and zinc concentrations ranged from 18.58 and 17.21%, respectively. Therefore, from the tested crosses, it is possible to obtain recombinants with high iron and zinc concentrations in Andean bean seeds. / Os objetivos desse trabalho foram investigar se ocorre efeito materno para a concentração de ferro e de zinco em sementes de feijão Andino, obter estimativas de parâmetros genéticos para esses minerais e selecionar recombinantes para o programa de biofortificação de feijão. Para tanto, hibridações controladas foram realizadas entre os parentais IAC Boreal x Light Red Kidney e Ouro Branco x Light Red Kidney para a obtenção das gerações F1, F1 recíproco, F2, F2 recíproco e retrocruzamentos RC11 (F1 x P1) e RC12 (F1 x P2). As gerações obtidas foram avaliadas em um experimento de campo conduzido no período de safrinha de 2014 em Santa Maria, RS. Nas sementes de feijão das populações segregantes obtidas a concentração de ferro variou de 24,70 a 102,40 mg kg-1 de matéria seca MS e a concentração de zinco foi de 10,70 a 37,50 mg kg-1 de MS, sem que a expressão de efeito materno tenha sido observada. A herdabilidade em sentido amplo estimada para a concentração de ferro nas sementes de feijão Andino variou de 52,36 a 67,83% e para zinco, a amplitude foi de 63,36 a 72,22%. A herdabilidade em sentido restrito para a concentração de ferro variou de 19,04 a 45,29% e para zinco, de 31,04 a 63,60%. Os ganhos de seleção obtidos para a concentração de ferro e de zinco nas sementes de feijão Andino foram de 18,58% e de 17,21%, respectivamente. Assim, a partir dos cruzamentos testados é possível obter recombinantes com alta concentração de ferro e de zinco nas sementes de feijão Andino.

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