Produção Nacional
Revisado por pares
Inbreeding depression of 28 maize elite open pollinated varieties
2002; Brazilian Society of Genetics; Volume: 25; Issue: 4 Linguagem: Inglês
10.1590/s1415-47572002000400014
ISSN1678-4685
AutoresCleso Antônio Patto Pacheco, M. X. dos Santos, Cosme Damião Cruz, S. N. Parentoni, P. E. de O. Guimarães, E. E. G. e Gama, Álvaro Eleutério Da Silva, H. W. L. de Carvalho, Pedro Abel Vieira Júnior,
Tópico(s)Genetic Mapping and Diversity in Plants and Animals
ResumoThe 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% (CMS-01) to 59.2% (CMS-30), with an average of 49.1%. 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.
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