02136naa a2200277 a 450000100080000000500110000800800410001910000130006024500950007326000090016830000310017750000110020852012360021965000160145565000220147165000180149365000130151165000260152465000150155065000120156565000170157765000250159470000210161970000240164077301940166413222782008-03-10       2001    bl uuuu     u00u1 u    #d1 aGROF, B.  aA novel technique to produce polygenic resistance to anthracnose in Stylosanthes capitata.  c2001  a p. 525-526. (ID n. 13-01)  aCNPGC.  aAn improved cultivar, based on17 genotypes of S.cpitata and six of S.macrocephala, was developed at the Embrapa Beef Cattle Research Center. Campo Grande, Brazil. The aim was o create durable, race non-spedific resistance to anthracnose controlled by polygenic factors. A mass hybridisation technique was employed to produce a higth degree of genetic diversity and sizeable quantities of seed of hybriderived progenies of Brazilian and Venezuelan genotypes of S.capitata. Outcrossing resulted in a significant improvement in the forage production of progeny of Venezuelan accessions. The multicross was evaluated in multilocational trials, each representing a large tract of country  in the Cerradis ecosystem along  a north-south transect from lat 6 to 20 S. The genetic shift that accourred in  S. capitata was a key element in the formation of the new cultivar. It is a complex mixture of two especies, and a reombination of murch desired forage tratis of Brazilian x Venezuelan genotypes, high forage and seed yields coupled eith anthracnose resistance. The new cultivar with its diverse genetic make up has  a wide application in the acid-soil savannas of tropical America. It was released by Embrapa for the Cerrados in 2000.  aanthracnose  agenetic variation  ahybridization  asavannas  aStylosanthes capitata  aAntracnose  aCerrado  aHibridação  aVariedade Resistente1 aFERNANDES, C. D.1 aFERNANDES, A. T. F.  tIn: INTERNATIONAL GRASSLAND CONGRESS, 19., 2001, São Pedro. Grassland ecosystems: an outlook into the 21st century: proceedings. Piracicaba: Sociedade Brasileira de Zootecnia: FEALQ, 2001.