01883naa a2200217 a 450000100080000000500110000800800410001910000160006024500930007626000090016952012820017865000140146065000100147465000220148465300270150665300170153370000200155070000150157070000190158577300610160415779762009-12-15       2009    bl ---       0--  u    #d1 aCARGNIN, A.  aGenetic and environmental contributions to incresead wheat yeld in Minas Gerais, Brazil.  c2009  aProducers need wheat cultivars adapted to the predominant climate conditions of the end of the rainy period. Having this in mind, EPAMIG (Agriculture and Livestock Research Institute of Minas Gerais) has been developing a wheat genetic improvement program since 1976, and the estimates of the genetic improvement established by the breeding programs could be useful to quantify their efficiency. This study focused on the quantification of the genetic progress achieved by these improvement programs of dryland wheat in the Brazilian-savanna between 1976 and 2005. The efficiency of these programs was evaluated based on grain yield data of VCU (Vale for Cultivation and Use) trials conducted at ten locations in the Minas Gerais State, Brazil. Th mean estimated genetic progress for mean grain yield between 1976 and 2005 was 37 kg ha-1 year. The genetic yield gain in the study period indicates that the improvement programs of dryland wheat in the Brazilian-savanna are effective. Besides the marked contribution of genetic gain, the environmental and technological improvements were also relevant for the yield, accounting for 47,4% of the total progress in the period. The improvement programs of dryland wheat resulted in a genoytpe renovation rate of 35% over the years.  aGenótipo  aTrigo  aTriticum aestivum  aMelhoramento genético  aMinas Gerais1 aSOUZA, M. A. de1 aFRONZA, V.1 aFOGAÇA, C. M.  tScientia Agricolagv.66, n.3, p.317-322, may/jun., 2009.