01899naa a2200253 a 450000100080000000500110000800800410001902000180006010000150007824501600009326000090025350002570026252008610051965000220138065000190140265000130142165300250143465300220145965300270148165300260150865300220153465300230155677300660157916458182000-05-08       2000    bl uuuu     u00u1 u    #d  a85-87697-05-61 aSECOND, G.  aManihot glaziovii contributed to the genetic make-up of cassava and represents an example of dynamic conservation and on-farm breeding of genetic resources  c2000  aIn: INTERNATIONAL SCIENTIFIC MEETING ON CASSAVA BIOTECHNOLOGY, 1998. Salvasor-Bahia. Proceedings... Brasilia, DF: Embrapa Recursos Geneticos e Biotecnologia/CBN, 2000. 625p. Editado por Luiz J. C. B. Carvalho, Ann Marie Thro, Alberto Duarte Vilarinhos.  aMolecualr markers (RAPD and AFLP, in our case) confirmed that M. esculenta ssp flabellifolia is the direct ancestor of cassava but also pointed out that some other species have likely contributed to the genetic diversity of cassava. We present AFLP and RAPD data that 1) give new information on the closest relatives to cassava, 2) confirm that M. carthaginensis s. l. (that includes M. glaziovii mostly referred to here) is the most divergent species from cassava among Brasilian species but that it has hybridised with cassava, leading to introgressed cultivars and also intermediate forms that reproduce vegetatively (by the farmers) or spontaneously by true seeds and 3) show that a group of traditional cultivars have close afffinity with a cultivar artificially  introgressed from M. glaziovii and with some of the intermediate forms mentioned above.  agenetic resources  aplant breeding  aMandioca  aDiversidade genetica  aGenetic diversity  aMarcadores moleculares  aMelhoramento genetico  aMolecular marbers  aRecursos geneticos  tBrasilia: Embrapa Recursos Genetico e Biotecnologia/CBN, 2000