Inbreeding depression of 28 maize elite open pollinated varieties
Genet. mol. biol
;
25(4): 441-448, Dec. 2002. tab
Artículo
en Inglés
| LILACS
| ID: lil-330604
RESUMO
The study of inbreeding depression is important for breeding strategies such as use of inbred progenies or extraction of inbreed lines. A diallel of 28 maize open-pollinated varieties was evaluated in 10 environments in the early 1990s. At the same time, S1 populations for each of the 28 varieties were evaluated in the same 10 experiments (environments). Yield reductions of the populations from S0 to S1 (mean of the 10 environments), varied from 34.6 percent (CMS-01) to 59.2 percent (CMS-30), with an average of 49.1 percent. Inbreeding depression was greater in populations with a wider genetic base, which had never been exposed to inbreeding (CMS-30, BR-107, PH4, Cunha, Saracura, Nitrodent, and Nitroflint). Inbred lines with greater yield means should be obtained from the BR-105, BR-111, CMS-01, CMS-03, BR-106, CMS-14c, and CMS-28 populations. The use of parameter estimates generated by analysis of inbreeding depression, allow to make inferences about frequencies of deleterious alleles in the population. The frequencies of favorable alleles in the parents can be obtained by diallel analysis. The association of these two types of information, can provide a better interpretation of the genetic parameters and also can improve the process of selection of parents for either an intra- or an inter-populational breeding program
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Zea mays
/
Cruzamientos Genéticos
/
Endogamia
Idioma:
Inglés
Revista:
Genet. mol. biol
Asunto de la revista:
Genética
Año:
2002
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
Embrapa Milho e Sorgo/BR
/
Embrapa Milho e Sorgov/BR
/
Embrapa SPSB Gerencia Local de Ponta Grossa/BR
/
Embrapa Tabuleiros Costeiros/BR
/
Universidade Federal de Viçosa/BR
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