Interação genótipos x ambientes para carotenóides em cultivares de milho

• Ano de defesa: 2008
• Autor(a) principal: Rios, Sara de Almeida
• Orientador(a): Oliveira, Aluízio Borém de
• Banca de defesa: Gondim, Tânia Cristina de Oliveira , Sakiyama, Ney Sussumu
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Genética e Melhoramento
• Departamento: Genética animal; Genética molecular e de microrganismos; Genética quantitativa; Genética vegetal; Me
• País: BR
• Palavras-chave em Português: Biofortificação; Zea mays; Carotenóides; Interação genótipo x ambiente; Adaptabilidade; Estabilidade
• Palavras-chave em Inglês: Biofortification; Zea mays; Carotenoids; Genotype x environment interaction; Adaptability; Stability
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::MELHORAMENTO VEGETAL
• Link de acesso: http://locus.ufv.br/handle/123456789/4669

The aim of this work was to study the genotype x environment interaction for the carotenoids corn grain composition, its consequence, in addition to the adaptability and stability, using ten maize cultivars grown in five different environments, in the 2004/2005 agricultural year. The experimental design was a randomized complete block with two replications. The chemical analyses were conducted in the Grains Quality and Fodder Laboratory of the Embrapa National Research Centre for Maize and Sorghum, located in Sete Lagoas, Brazil. Total carotenois (CT), lutein, zeaxanthin, &#946;-cryptoxanthin, &#945;-carotene, &#946;-carotene, total of carotenoids with provitamin A activity (Pro VA), expressed on &#956;g g-1, grain yield (kg ha-1) and CT and Pro VA (g ha-1) were quantified and expressed in dry basis. For the adaptability and stability study it were used Eberhart and Russell (1966), Lin and Bins (1988) and Rocha et al. (2005) methodologies. The genotype x environment interaction was significant (p < 0.01) for all variables, except productivity (kg ha-1) and CT (g ha- 1) (p > 0.05) and the environmental variation coefficients were between 3.42 and 16.60%. CT, &#946;-carotene and Pro VA means (&#956;g g-1) in cultivars evaluated were lower to those quantified in lines and elite lines of maize breeding programs, as well as Brazilians Maize Germplasm Bank access. Grain yield mean, 8 ton ha-1, was higher than national average, of 4 ton ha-1. It were obtained high and significant correlations between CT (&#956;g g-1) and zeaxanthin, &#946;-cryptoxanthin, &#946;- carotene and Pro VA (&#956;g g-1), and between grain yield (kg ha-1) and CT and Pro VA (g ha-1). The linear regression model proposed by Eberhart and Russell (1966), has not provided satisfactory adjustment based on the lutein, &#946;- cryptoxanthin, &#945;-carotene and Pro VA (&#956;g g-1) on evaluated cultivars grain content. However, considering the levels of CT and zeaxanthin (&#956;g g-1), all the three different adaptability and stability methodologies used were unanimous in ranking the BRS 2020 hybrid as ideal genotype of general adaptability.