01965naa a2200361 a 450000100080000000500110000800800410001902000180006010000170007824500640009526000090015930000110016850002490017952008090042865000190123765000130125665000160126965000130128565000140129865300230131265300210133565300150135665300260137165300110139770000150140870000180142370000190144170000170146070000150147770000260149270000190151877300660153716458052000-05-02       2000    bl uuuu     u00u1 u    #d  a85-87697-05-61 aALLEM, A. C.  aThe primary gene pool of cassava (Manihot esculenta crantz)  c2000  ap.3-14  aIn: INTERNATIONAL SCIENTIFIC MEETING ON CASSAVA BIOTECHNOLOGY, 1998. Salvador-Bahia. Proceedings... Brasilia, DF: Embrapa Recursos Geneticose Biotecnologia/CBN, 2000, 625p. Editado por Luiz J. C. B. CARVALHO, Ann M. Thro, Alberto D. Vilarinhos.  aA crop gene pool comprises three distinct categories of gene suppliers, primary, secondary, and tertiary gene pools. The primary gene pool (GP-1) is composed of gene reservoirs that cross easily with the domesticate and the crosses produce fertile offspring regularly. The secondary (GP-2) and tertiary (GP-3) gene pools comprise gene sources that cross with variable degrees of difficulty with the crop species, this implies less close genetic distances. The GP-1 is further subdivided in cultivated and wild gene pools. The cultivated gene pool englobes comercial stocks of the crop besides indigenous landraces and folk varieties of the domesticate. The wild GP-1 of a crop comprises putative ancestors and closely related species that show a fair degree of fertile relationships with the domesticate.  aplant breeding  ataxonomy  aGermoplasma  aMandioca  aTaxonomia  aBiological species  aBotanical origin  aGermoplasm  aMelhoramento genetico  aOrigem1 aROA, A. C.1 aMENDES, R. A.1 aSALOMAO, A. N.1 aBURLE, M. L.1 aSECOND, G.1 aCARVALHO, P. C. L. de1 aCAVALCANTI, J.  tBrasilia: Embrapa Recursos Genetico e Biotecnologia/CBN, 2000