Responses to selection and changes in combining ability after three cycles of a modified reciprocal recurrent selection in maize

This research reports responses to selection and changes in general (GCA) and specific (SCA) combining abilities after three cycles of a modified reciprocal recurrent selection procedure (MRRS) in EPB-4 and EPB-5 maize populations. In the MRRS procedure a cycle can be completed in 1 or 2 years depen...

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Bibliographic Details
Published in:Euphytica 2007-09, Vol.157 (1-2), p.185-194
Main Authors: Santos, Mateus Figueiredo, Câmara, Tassiano Maxwell Marinho, Moro, Gustavo Vitti, Costa, Emiliano Fernandes Nassau, De Souza, Cláudio Lopes Jr
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
alleles
artificial selection
Biological and medical sciences
Breeding schemes. Varia
corn
corn ears
Crop science
environmental factors
Fundamental and applied biological sciences. Psychology
general combining ability
Genetics
Genetics and breeding of economic plants
grain yield
height
loci
lodging
plant breeding
Plant breeding: fundamental aspects and methodology
reciprocal crosses
recurrent selection
seed productivity
selection response
specific combining ability
Varietal selection. Specialized plant breeding, plant breeding aims
Zea mays
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Summary:This research reports responses to selection and changes in general (GCA) and specific (SCA) combining abilities after three cycles of a modified reciprocal recurrent selection procedure (MRRS) in EPB-4 and EPB-5 maize populations. In the MRRS procedure a cycle can be completed in 1 or 2 years depending on the availability of winter breeding nurseries. The original and the three selection cycles of the two populations per se (eight entries) and the partial diallel developed from the crosses between them (16 entries) were evaluated in six environments. Realized response to selection on the population cross was 7.25% cycle-¹ for grain yield, -13.63% cycle-¹ for plant lodging, and 11.93% cyle-¹ for prolificacy, whereas plant and ear heights remained unchanged. GCA estimates increased with selection cycles for both populations for grain yield and prolificacy, and decreased for plant lodging, indicating that the frequency of favorable alleles with additive effects for these traits increased with the MRRS cycles in both populations. SCA estimates increased for grain yield and prolificacy indicating that the frequency of favorable complementary alleles at loci with non-additive effects in the reciprocal populations increased with the MRRS cycles. For grain yield, SCA effects increased more than GCA effects with selection cycles, indicating that MRRS exploited more the non-additive effects than the additive effects for the improvement of this trait. The overall results showed that the MRRS procedure was highly effective in improving the population cross, exploiting both GCA and SCA effects.
ISSN:0014-2336
1573-5060
DOI:10.1007/s10681-007-9410-x