PubAg

Main content area

Inheritance for economically important traits in popcorn from distinct heterotic groups by Hayman’s diallel

Author:
Silva, V. Q. R., Amaral JÚnior, A. T., Scapim, C. A., Freitas Júnior, S. P., Gonçalves, L. S. A.
Source:
Cereal research communications 2010 v.38 no.2 pp. 272-284
ISSN:
0133-3720
Subject:
agronomic traits, alleles, dominant genes, ears, genetic improvement, genotype, grain yield, heritability, hybrids, overdominance, parents, popcorn, popping, recessive genes, researchers, Brazil
Abstract:
When using genotypes of different heterotic groups, the scarcity of information on the inheritance of traits that are of economic importance to popcorn has hindered the implementation of more appropriate methodologies to obtain higher genetic gains. To date, the diallel of Hayman (1954) has not been used by popcorn researchers, but it has robust properties that can minimize this gap in scientific information. Therefore, ten popcorn lines were used to obtain 45 diallel hybrids, which were evaluated along with their parents and three controls in a randomized complete block design with three replicates at two different locations in the State of Rio de Janeiro, Brazil. Three agronomic traits of interest for the crop were scored based on the Hayman method (1954). The positive correlation between $$\bar Y_{ii} $$ and <i>W</i> <sub>i</sub> + <i>V</i> <sub>i</sub> showed that mostly recessive genes determine the expression of popping expansion (PE). It was concluded that dominant genes are mostly responsible for the trait expression of mean ear weight (EW) and grain yield (GY). A predominance of non-additive genetic effects for EW and GY existed and a prevalence of partial dominance and a high narrow-sense determined heritability for PE. For EW and GY, overdominance predominated and heritabilities were moderate to low. As an interpopulation method, popcorn lines with high concentrations of recessive alleles linked to the expression of PE can provide gains in PE and yield traits.
Agid:
4799198