02220naa a2200217 a 450000100080000000500110000800800410001910000160006024500980007626000090017430000120018349000370019550001800023252012380041270000240165070000200167470000160169470000200171070000260173077302460175614667892007-07-27       2004    bl uuuu     u00u1 u    #d1 aRECO, P. C.  aGenetics of resistance in soybeans to race 3 of Heterodera glycines and Meloidogyne javanica.  c2004  ap. 171.  a(Embrapa Soja. Documentos, 228).  aEditado por Flávio Moscardi, Clara Beatriz Hoffmann-Campo, Odilon Ferreira Saraiva, Paulo Roberto Galerani, Francisco Carlos Krzyzanowski, Mercedes Concordia Carrão-Panizzi.  aThe genetics of resistance to soybean cyst nematode (SCN) and root-knot (M. javanica) was studied in 100 individuals of the parentals, 60 families F3 and 120 families F4 of BRS 133 (susceptible) x Gordon (resistant) crossing. The experiments were carried out in the 2002/03 season, in fields infested at Assis-SP (SCN) and Londrina-PR (root-knot). The experimental design was entirely randomized and each plot was represented by an individual plant spaced 0,2 m x 0,45 m. The evaluation of the nematode reaction was donne at stadiums R4 and R6. In agreement with the presence of cysts or galls in the root system, each plant was graded fron zero (abscence of galls or cysts) to five. For both nematode species, significant differences were verified between the two parentals the studied characteres. The grades given for galls or cysts in the generations F3 and F4 were similar and placed next to the average value between the parentals. The mean components revealed only the presence of additive effects. Addictive-dominant model was perfectly adjusted to data. In both studies, genotype by environment interaction was detected. Results suggest the possibility of gains with selection for the resistance to the two nematode species.1 aTOLEDO, J. F. F. de1 aSILVA, J. F. V.1 aDIAS, W. P.1 aARIAS, C. A. A.1 aCARNEIRO, G. E. de S.  tIn: WORLD SOYBEAN RESEARCH CONFERENCE, 7.; INTERNATIONAL SOYBEAN PROCESSING AND UTILIZATION CONFERENCE, 4.; CONGRESSO BRASILEIRO DE SOJA, 3., 2004, Foz do Iguassu. Abstracts of contributed papers and posters. Londrina: Embrapa Soybean, 2004.