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Revista Ceres

versão impressa ISSN 0034-737X

Resumo

FRITSCHE-NETO, Roberto; RESENDE, Marcos Deon Vilela; MIRANDA, Glauco Vieira  e  DOVALE, Júlio César. Genome wide selection and new methods of maize breeding. Rev. Ceres [online]. 2012, vol.59, n.6, pp.794-802. ISSN 0034-737X.  http://dx.doi.org/10.1590/S0034-737X2012000600009.

The objectives of this work were to verify the accuracy of the Genome Wide Selection method (GWS) in the maize breeding for nutritional stress conditions and propose new breeding methods based on GWS. The efficiency of two components of use of nitrogen and phosphorus (absorption and utilization) was estimated in 41 single-cross hybrids assessed in two experiments under low and high availability of N and P. Eighty microsatellite markers were used to genotype the base population. The estimates of genetic parameters were obtained by REML/BLUP and the predictions of genetic genomic values were obtained by random regression (RR), applied to genome wide selection (RR-BLUP/GWS). GWS showed high values of accuracy for the traits; it was comparable to the methods of Recurrent Intra and Interpopulational Selection. It was concluded that there is a significant increase in selective accuracy and in the genetic gains per unit of time with use of GWS.

Palavras-chave : marker assisted selection; recurrent selection; abiotic stresses.

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