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Identification of quantitative trait loci for kernel-related traits and the heterosis for these traits in maize (Zea mays L.)
- Source :
- Molecular genetics and genomics : MGG. 295(1)
- Publication Year :
- 2019
-
Abstract
- Heterosis has been extensively applied for many traits during maize breeding, but there has been relatively little attention paid to the heterosis for kernel size. In this study, we evaluated a population of 301 recombinant inbred lines derived from a cross between 08-641 and YE478, as well as 298 hybrids from an immortalized F2 (IF2) population to detect quantitative trait loci (QTLs) for six kernel-related traits and the mid-parent heterosis (MPH) for these traits. A total of 100 QTLs, six pairs of loci with epistatic interactions, and five significant QTL × environment interactions were identified in both mapping populations. Seven QTLs accounted for over 10% of the phenotypic variation. Only four QTLs affected both the trait means and the MPH, suggesting the genetic mechanisms for kernel-related traits and the heterosis for kernel size are not completely independent. Moreover, more than half of the QTLs for each trait in the IF2 population exhibited dominance, implying that dominance is more important than other genetic effects for the heterosis for kernel-related traits. Additionally, 20 QTL clusters comprising 46 QTLs were detected across ten chromosomes. Specific chromosomal regions (bins 2.03, 6.04–6.05, and 9.01–9.02) exhibited pleiotropy and congruency across diverse heterotic patterns in previous studies. These results may provide additional insights into the genetic basis for the MPH for kernel-related traits.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Heterosis
Population
Quantitative Trait Loci
Quantitative trait locus
Biology
01 natural sciences
Zea mays
03 medical and health sciences
Inbred strain
Genetics
Hybrid Vigor
Inbreeding
education
Molecular Biology
Crosses, Genetic
Hybrid
education.field_of_study
food and beverages
Chromosome Mapping
Epistasis, Genetic
General Medicine
Phenotype
030104 developmental biology
Trait
Epistasis
010606 plant biology & botany
Subjects
Details
- ISSN :
- 16174623
- Volume :
- 295
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Molecular genetics and genomics : MGG
- Accession number :
- edsair.doi.dedup.....a74c56dfd01c9a02cbc4ce2f162c67e6