Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/484395
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dc.contributor.authorSANTOS, M. X. dospt_BR
dc.contributor.authorPOLLAK, L. M.pt_BR
dc.contributor.authorPACHECO, C. A. P.pt_BR
dc.contributor.authorGUIMARAES, P. E. O.pt_BR
dc.contributor.authorPETERNELLI, L. A.pt_BR
dc.contributor.authorPARENTONI, S. N.pt_BR
dc.contributor.authorNASS, L. L.pt_BR
dc.date.accessioned2011-04-10T11:11:11Zpt_BR
dc.date.available2011-04-10T11:11:11Zpt_BR
dc.date.created2000-11-07pt_BR
dc.date.issued2000pt_BR
dc.identifier.citationGenetics and Molecular Biology, Ribeirão Preto, v. 23, n. 2, p. 445-451, 2000.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/484395pt_BR
dc.descriptionMaize breeders frequently wish to use exotic germplasm in their breeding programs without losing specific characteristics of their adapted material. The objective of this study was to determine the optimal proportions of exotic germplasm to incorporate into adapted populations (F2 = 50% exotic, BC1 = 25% exotic, BC2 = 12.5% exotic and BC3 = 6.25% exotic) to form the initial foundation population and to determine the heterosis between adapted x exotics. We used six exotic populations of different origins and two adapted populations representing a Brazilian heterotic pattern. In 1993-94 and 1994-95, the parents, F1, F2, BC1, BC2, BC3 and four checks were evaluated in six environments in central Brazil using an 8 x 9 simple rectangular lattice design. Higher mean values for yield were obtained as the proportions of exotic germplasm decreased. Some backcrosses produced more than the adapted populations BR 105 (7.59 ton/ha) and BR 106 (8.43 ton/ha). The best results were obtained when incorporating 6.25 or 12.5% of exotic genes. This trend was true for root lodging, stalk lodging and ear diseases but not for plant and ear height. The midparent heterosis for yield varied from - 16.1 to 40.3%. Midparent heterosis with positive and negative values were also found for the other traits. The results indicate the potential of exotic germplasm for developing good hybrids. After choosing the best exotic source, some recurrent selection might be appropriate in order to adapt and improve the exotic populations.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectExoticopt_BR
dc.subjectMaizept_BR
dc.subjectExoticpt_BR
dc.titleIncorporating different proportions of exotic maize germplasm into two adapted populations.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2018-06-08T11:11:11Zpt_BR
dc.subject.thesagroGermoplasmapt_BR
dc.subject.thesagroMelhoramentopt_BR
dc.subject.thesagroMilhopt_BR
dc.subject.thesagroZea Mayspt_BR
dc.subject.nalthesaurusbreedingpt_BR
dc.subject.nalthesaurusgermplasmpt_BR
riaa.ainfo.id484395pt_BR
riaa.ainfo.lastupdate2018-06-08 -03:00:00pt_BR
dc.contributor.institutionCLESO ANTONIO PATTO PACHECO, CNPMS; PAULO EVARISTO DE O GUIMARAES, CNPMS; SIDNEY NETTO PARENTONI, CNPMS.pt_BR
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