02228naa a2200301 a 450000100080000000500110000800800410001910000220006024500660008226000090014850000940015752012900025165000230154165000140156465000220157865000160160065000250161665000270164165300290166865300220169765300230171965300130174270000200175570000220177570000190179770000210181677300890183710842162018-10-25       2003    bl uuuu     u00u1 u    #d1 aGRAVINA, G. de A.  aDiallel analysis for frogeye leaf spot resistance in soybean.  c2003  aTítulo em português: Análise dialélica da resistência à mancha olho-de-rã em soja.  aSeven soybean cultivars (Bossier, Cristalina, Davis, Kent, Lincoln, Paraná and Uberaba), with different levels of resistance to Cercospora sojina, were crossed in a diallel design to determine the general (GCA) and specific (SCA) combining abilities relative to the inheritance of the resistance. Race 04 of the fungus was inoculated in the parents and in the 21 F1 hybrids in a greenhouse in a completely randomized design, with 12 replications. The reactions to the disease were evaluated 20 days after the inoculation, always on the most infected leaflet. Both GCA and SCA were significant for all the evaluated characters, being inferred that, for the expression of the characters, the additive, dominant and, possibly, epistatic genic actions were important. The largest values of estimated SCA effectwere observed in the hybrid combinations where at least one parent presented high GCA. Cristalina, Davis and Uberaba cultivars showed the largest estimates for GCA effect (), and from the analysis of , the contribution of these parents to heterosis of their hybrids will be towards the reduction of the disease symptoms. Therefore, these cultivars are indicated as parents in breeding programs that seek the development of soybean cultivars with resistance to frogeye leaf spot.  agenetic resistance  aheterosis  aCercospora Sojina  aGlycine Max  aParâmetro Genético  aResistência Genética  acapacidade combinatória  acombining ability  agenetic parameters  aheterose1 aSEDIYAMA, C. S.1 aMARTINS FILHO, S.1 aMOREIRA, M. A.1 aBARROS, E. G. de  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 38, n. 6, p. 673-680, jun. 2003