Genetic diversity in tropical maize inbred lines: heterotic group assignment and hybrid performance determined by RFLP markers

2000 ◽  
Vol 119 (6) ◽  
pp. 491-496 ◽  
Author(s):  
L. L. Benchimol ◽  
C. L. de Souza jr ◽  
A. A. F. Garcia ◽  
P. M. S. Kono ◽  
C. A. Mangolin ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Inbred Lines ◽  
Heterotic Group ◽  
Rflp Markers ◽  
Hybrid Performance ◽  
Tropical Maize ◽  
Group Assignment ◽  
Maize Inbred Lines

scholarly journals Phenotypic and molecular characterization of a set of tropical maize inbred lines from a public breeding program in Brazil

BMC Genomics ◽  
2022 ◽  
Vol 23 (1) ◽  
Author(s):  
Sirlene Viana de Faria ◽  
Leandro Tonello Zuffo ◽  
Wemerson Mendonça Rezende ◽  
Diego Gonçalves Caixeta ◽  
Hélcio Duarte Pereira ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Inbred Lines ◽  
Breeding Program ◽  
Tropical Maize ◽  
Maize Breeding ◽  
Breeding Programs ◽  
The Public ◽  
Maize Inbred Lines

Abstract Background The characterization of genetic diversity and population differentiation for maize inbred lines from breeding programs is of great value in assisting breeders in maintaining and potentially increasing the rate of genetic gain. In our study, we characterized a set of 187 tropical maize inbred lines from the public breeding program of the Universidade Federal de Viçosa (UFV) in Brazil based on 18 agronomic traits and 3,083 single nucleotide polymorphisms (SNP) markers to evaluate whether this set of inbred lines represents a panel of tropical maize inbred lines for association mapping analysis and investigate the population structure and patterns of relationships among the inbred lines from UFV for better exploitation in our maize breeding program. Results Our results showed that there was large phenotypic and genotypic variation in the set of tropical maize inbred lines from the UFV maize breeding program. We also found high genetic diversity (GD = 0.34) and low pairwise kinship coefficients among the maize inbred lines (only approximately 4.00 % of the pairwise relative kinship was above 0.50) in the set of inbred lines. The LD decay distance over all ten chromosomes in the entire set of maize lines with r2 = 0.1 was 276,237 kb. Concerning the population structure, our results from the model-based STRUCTURE and principal component analysis methods distinguished the inbred lines into three subpopulations, with high consistency maintained between both results. Additionally, the clustering analysis based on phenotypic and molecular data grouped the inbred lines into 14 and 22 genetic divergence clusters, respectively. Conclusions Our results indicate that the set of tropical maize inbred lines from UFV maize breeding programs can comprise a panel of tropical maize inbred lines suitable for a genome-wide association study to dissect the variation of complex quantitative traits in maize, mainly in tropical environments. In addition, our results will be very useful for assisting us in the assignment of heterotic groups and the selection of the best parental combinations for new breeding crosses, mapping populations, mapping synthetic populations, guiding crosses that target highly heterotic and yielding hybrids, and predicting untested hybrids in the public breeding program UFV.

Microsatellite marker-based genetic diversity of tropical-adapted shrunken-2 maize inbred lines and its relationship with normal endosperm inbred lines of known heterotic classification

2021 ◽  
pp. 1-8
Author(s):  
J. E. Iboyi ◽  
A. Abe ◽  
V. O. Adetimirin
Keyword(s):  
Genetic Diversity ◽  
Gene Diversity ◽  
Polymorphic Information Content ◽  
Inbred Lines ◽  
Heterotic Group ◽  
Germplasm Management ◽  
Maize Breeding ◽  
Heterotic Groups ◽  
Maize Population ◽  
Maize Inbred Lines

Abstract Knowledge of the genetic diversity and relationships among maize inbred lines can facilitate germplasm management and plant breeding programmes. The study investigated the level of genetic diversity among S6 lines developed from a tropical-adapted shrunken-2 (sh-2) maize population and their relationship with normal endosperm tropical inbred lines of known heterotic groups. Ninety-one sh-2 maize inbred lines (UI1-UI91) developed in the University of Ibadan super-sweet Maize Breeding Programme were genotyped at 30 simple sequence repeat (SSR) loci, alongside five normal endosperm maize inbred lines viz. TZi3, TZi4, TZi10, TZi12 and TZi15, four of which belong to two heterotic groups. Twenty-three SSR markers were polymorphic and detected a total of 61 alleles, with a range of 2–7 and an average of 2.65 alleles per locus. The polymorphic information content ranged from 0.12 in bnlg1937 to 0.77 in phi126, with an average of 0.36. The gene diversity (He) averaged 0.43. Cluster analysis resulted in five groups consisting of 16, 36, 17, 23 and 3 inbred lines, with one sh-2 line ungrouped. TZi 12 and TZi 15, both of which are of the same heterotic group, clustered with TZi 3 of another heterotic group. Considerable genetic diversity exists among the 96 inbred lines. Only two of the five normal endosperm lines shared clusters with the sh-2 lines. The clustering of the normal endosperm inbred lines is not related to their established heterotic patterns. Inbred lines in two clusters offer the possibility of guiding the exploitation of heterosis among the sh-2 lines.

Genetic diversity of tropical maize inbred lines combining resistance to Striga hermonthica with drought tolerance using SNP markers

2017 ◽  
Vol 136 (3) ◽  
pp. 338-343 ◽  
Author(s):  
Wende Abera Mengesha ◽  
Abebe Menkir ◽  
Nnanna Unakchukwu ◽  
Silvestro Meseka ◽  
Adetutu Farinola ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Drought Tolerance ◽  
Inbred Lines ◽  
Snp Markers ◽  
Striga Hermonthica ◽  
Tropical Maize ◽  
Maize Inbred Lines

Retrotransposon-related genetic distance among inbred lines of sweet corn (Zea mays var. saccharata) and hybrid performance

2016 ◽  
Vol 16 (1) ◽  
pp. 50-58
Author(s):  
Georgi Bonchev ◽  
Lydia Shtereva ◽  
Rumiana Vassilevska-Ivanova
Keyword(s):  
Genetic Diversity ◽  
Sweet Corn ◽  
Correlation Study ◽  
Inbred Lines ◽  
Genetic Distances ◽  
Hybrid Performance ◽  
Maize Breeding ◽  
Relative Contribution ◽  
Maize Inbred Lines ◽  
Heterosis Effect

AbstractHeterosis is a main force underlying the hybrid seed industry in maize. Our experimental approach consists of a correlation study between retrotransposon-related genetic distances between parental inbred lines and hybrid performance. The assumption is that, at least for certain traits, heterosis results from genome rearrangements, largely related to retrotransposon insertions and/or removals. Fifteen maize inbred lines and one F1 hybrid, representative of the genetic diversity among sweet corn and field corn lines were screened for polymorphism by retrotransposon microsatellite amplified polymorphism markers. DNA fingerprints served as row data for estimating genetic diversity of maize inbred lines and its correlation with the heterotic effect in their hybrids. A correlation between phenotypic and molecular distances was evident only at the level of individual inbred lines. Weak correlation between genetic distances and heterosis effect was observed for the average of all inbred lines. Phenotypic distances negatively correlated with heterosis for insertion height, diameter of the ear and number of kernel rows per ear. The relative contribution of each inbred line to heterosis in its derived hybrids was also estimated. Accordingly, we identified inbred lines with increased genetic distances that mostly add to the heterosis effect in their hybrids and that we recommend as prospective to be used in maize breeding programmes.

scholarly journals Genetic diversity and population structure of early-maturing tropical maize inbred lines using SNP markers

PLoS ONE ◽  
2019 ◽  
Vol 14 (4) ◽  
pp. e0214810 ◽  
Author(s):  
Gloria Boakyewaa Adu ◽  
Baffour Badu-Apraku ◽  
Richard Akromah ◽  
Ana Luisa Garcia-Oliveira ◽  
Frederick Justice Awuku ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Inbred Lines ◽  
Snp Markers ◽  
Tropical Maize ◽  
Maize Inbred Lines ◽  
Early Maturing

Heterotic grouping of tropical maize inbred lines and their hybrid performance under stem borer infestation and low soil nitrogen condition in West and Central Africa

Euphytica ◽  
2021 ◽  
Vol 217 (1) ◽  
Author(s):  
Muyideen Oluseyi Olayiwola ◽  
Samson Oyewole Ajala ◽  
Omolayo Johnson Ariyo ◽  
David Kolawole Ojo ◽  
Melaku Gedil
Keyword(s):  
Soil Nitrogen ◽  
Central Africa ◽  
Stem Borer ◽  
Inbred Lines ◽  
Hybrid Performance ◽  
Tropical Maize ◽  
Maize Inbred Lines ◽  
Heterotic Grouping ◽  
West And Central Africa

Genotypic variation and relationships among traits for root morphology in a panel of tropical maize inbred lines under contrasting nitrogen levels

Euphytica ◽  
2019 ◽  
Vol 215 (3) ◽  
Author(s):  
Lívia Gomes Torres ◽  
Diego Gonçalves Caixeta ◽  
Wemerson Mendonça Rezende ◽  
Andreia Schuster ◽  
Camila Ferreira Azevedo ◽  
...  
Keyword(s):  
Root Morphology ◽  
Genotypic Variation ◽  
Inbred Lines ◽  
Tropical Maize ◽  
Nitrogen Levels ◽  
Maize Inbred Lines

scholarly journals Comparative analysis of genetic diversity among the maize inbred lines (Zea mays L.) obtained by RAPD and SSR markers

2008 ◽  
Vol 51 (1) ◽  
pp. 183-192 ◽  
Author(s):  
Silvia Graciele Hülse de Souza ◽  
Valéria Carpentieri-Pípolo ◽  
Claudete de Fátima Ruas ◽  
Valdemar de Paula Carvalho ◽  
Paulo Maurício Ruas ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Ssr Markers ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Pedigree Data ◽  
Dice Coefficient ◽  
Quantitative Characters ◽  
Maize Inbred Lines ◽  
Ssr Primers ◽  
Selection Of

The RAPD and SSR markers were used to compare the genetic diversity among the 16 maize inbred lines. Twenty-two primers were used in the RAPD reactions, resulting in the amplification of 265 fragments, while 16 pairs of SSR primers resulted in 75 fragments. The similarity based on Dice coefficient for the RAPD ranged from 53 to 84% and for the SSR from 11 to 82%. The dendrogram obtained by the RAPD showed five groups, while dendrogram obtained by the SSR showed three groups and one isolated line. The association constructed from the markers and the principal coordinate’s analysis separated lines into two groups according to endosperm color, either orange or yellow. The RAPD were effective to validate pedigree data, while the SSR were effective to recognize the differences between the quantitative characters. Because they assess the distinct regions of the genome, the selection of one or other marker would depend on the characteristics of the material used and the objectives of the project.

scholarly journals Potential in a collection of adapted and exotic tropical maize inbred lines as resistance source for stem borers

2018 ◽  
Vol 10 (8) ◽  
pp. 183-190 ◽  
Author(s):  
Olaitan Oloyede-Kamiyo Qudrah ◽  
Oyewole Ajala Sam ◽  
Oluwatoyosi Job Anthony
Keyword(s):  
Inbred Lines ◽  
Tropical Maize ◽  
Stem Borers ◽  
Maize Inbred Lines ◽  
Resistance Source
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