Desempenho de famílias s0:2 da população CNA9 do programa de melhoramento de arroz de terras altas para a agricultura familiar

• Autor(a) principal: GUEDES, Janine Magalhães
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/2671
• topic: Arroz; Melhoramento; Inoculante; Agricultura familiar; Seleção recorrente; Rice; breeding; inoculant; family cropping; recurrent selection; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::SILVICULTURA::GENETICA E MELHORAMENTO FLORESTAL

Rice (Oryza sativa) stands out in Brazil for its economic and social importance, being an important source of protein and energy. Selecting lines of upland rice adapted to different environments is critical to the success of breeding programs targeted to family farmers in the state of Goiás, The objective of this work was to evaluate S0:2 families drawn from CNA9 population of the upland rice breeding program in greenhouse and in the field, aiming to select families for recombination and obtainment of a new selecting cycle. 50 families from CNA9 population from recurrent selection were used, in four experiments, with N, P, and inoculant combinations, in a randomized bloc design arrangement with two replicates in greenhouse. Traits evaluated were: plant height, chlorophyll content, canopy dry matter, roots dry matter and volume. The field experiment was arranged in a 14 X 14 square lattice, with 194 families, two controls, and three replicates. Traits evaluated were: plant height, flowering and yield, besides the following diseases: leaf and neck blast, scald, brown spot, grain spot, and narrow leaf spot. Results obtained from greenhouse indicate that families studied performed similarly in the absence of the inoculant, but responded differently for plant height, dry matter, and root volume, regarding nitrogen and phosphorus combinations. Field data showed that the families drawn from CNA9 population showed superior performance when compared to controls and to the original population, especially regarding neck blast and yield. It was possible to select 48 families from the field to recombine in the next breeding cycle.