Seleção de progênies de cafeeiro oriundas da hibridação de cultivares Catuaí com germoplasma Icatú e Híbrido de Timor
Data
2014-08-08
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Universidade Federal de Lavras
Resumo
Objetivou-se selecionar progênies de Coffea arabica com elevada capacidade produtiva, portadoras de outras características agronômicas e tecnológicas de interesse, que apresentem potencial para constituir novas cultivares para plantio comercial. Foram instalados três experimentos em três regiões produtoras de café em Minas Gerais, sendo um na Universidade Federal de Lavras, em Lavras; um na Fazenda Ouro Verde, em Campos Altos e um na Fazenda Experimental da EPAMIG, em Patrocínio. Foram avaliadas 18 progênies de cafeeiro em geração F 5 . Das 18 progênies, oito são do grupo Catucaí (cruzamento de cultivares do grupo Catuaí com cafeeiros do germoplasma Icatu), dez são descendentes do Híbrido de Timor (Catuaí Vermelho e Catuaí Amarelo com Híbrido de Timor) e duas cultivares comerciais como testemunha. O delineamento experimental utilizado foi o de blocos casualizados, com três repetições e parcelas constituídas por dez plantas, sendo considerada parcela útil todas as plantas. As avaliações foram realizadas durante seis colheitas (2008, 2009, 2010, 2011, 2012 e 2013). As características avaliadas foram produtividade em (sacas.ha -1 ), vigor vegetativo (notas 1-10), porcentagem de frutos chocho, porcentagem de grãos retidos em peneira ‘16 e acima’, porcentagem de grãos tipo moca e rendimento (L). Os parâmetros estimados foram herdabilidade e acurácia. Foi feita análise conjunta para cada característica em cada local. Para escolher as melhores progênies, foi feito o ranqueamento de acordo com o índice de seleção de Mulamba e Mock (1978) conhecido como soma de postos. A soma de postos usada como índice de seleção apontou as progênies 10 (H516-2-1-1-18-1-2) e 15 (H419-3-4-5-2-1-2) com grande potencial para constituírem novas cultivares de café arábica para plantios comerciais.
The objective of this research was to select progenies of coffea arabica with high production capacity, carriers of other agronomic and technological characteristics of interest that have the potential to constitute in new cultivars for commercial planting. Three experiments were conducted in three coffee producing regions in Minas Gerais, one in the Universidade Federal de Lavras, one at FazendaOuro Verde in Campos Altos and at the Experimental Farm of EPAMIG in Patrocínio. 18 coffee progenies were evaluated in the F5 generation. Eight are the Catucaí group (cross of cultivars Catuaí group with coffee germplasm Icatú), ten are descendants of Timor Hybrid (Red Catuaí and Yellow Catuaí with Timor Hybrid) and two commercial cultivars as control treatments. The experimental design was a randomized complete block design with three replications, each consisting of ten plants per plot being considered all the plants. The evaluations carried out during for six harvests (2008, 2009, 2010, 2011, 2012 and 2013). The traits evaluated were, yield (bags.ha-1), vegetative vigor (grades 1-10), percentage of fruits with empty locule, percentage of grain retained in sieve '16 and above ', percentage of oval grain type and bean yield (L). The parameters estimated were, heritability and accuracy. Conjoint analysis for each trait at each site was done. To choose the best progeny was done by the ranking proposed by Mock e Mulamba, (1978) known as the sum of ranks. The sum of ranks used as selection index pointed progenys 10 (H516-2-1-1-18-1-2) and 15 (H419-3-4-5-2-1-2) with great potential for constitute in new cultivars of arabica coffee for commercial plantations.
The objective of this research was to select progenies of coffea arabica with high production capacity, carriers of other agronomic and technological characteristics of interest that have the potential to constitute in new cultivars for commercial planting. Three experiments were conducted in three coffee producing regions in Minas Gerais, one in the Universidade Federal de Lavras, one at FazendaOuro Verde in Campos Altos and at the Experimental Farm of EPAMIG in Patrocínio. 18 coffee progenies were evaluated in the F5 generation. Eight are the Catucaí group (cross of cultivars Catuaí group with coffee germplasm Icatú), ten are descendants of Timor Hybrid (Red Catuaí and Yellow Catuaí with Timor Hybrid) and two commercial cultivars as control treatments. The experimental design was a randomized complete block design with three replications, each consisting of ten plants per plot being considered all the plants. The evaluations carried out during for six harvests (2008, 2009, 2010, 2011, 2012 and 2013). The traits evaluated were, yield (bags.ha-1), vegetative vigor (grades 1-10), percentage of fruits with empty locule, percentage of grain retained in sieve '16 and above ', percentage of oval grain type and bean yield (L). The parameters estimated were, heritability and accuracy. Conjoint analysis for each trait at each site was done. To choose the best progeny was done by the ranking proposed by Mock e Mulamba, (1978) known as the sum of ranks. The sum of ranks used as selection index pointed progenys 10 (H516-2-1-1-18-1-2) and 15 (H419-3-4-5-2-1-2) with great potential for constitute in new cultivars of arabica coffee for commercial plantations.
Descrição
Tese de Doutorado defendida na Universidade Federal de Lavras
Palavras-chave
Melhoramento genético, Ranqueamento, Soma de postos
Citação
CARVALHO, J. P. F. Seleção de progênies de cafeeiro oriundas da hibridação de cultivares Catuaí com germoplasma Icatú e Híbrido de Timor. 2014. 82 f. Tese (Doutorado em Agronomia-Fitotecnia) - Universidade Federal de Lavras, Lavras. 2014.