Genetic Variation Among Tropical Maize Inbred Lines from NARS and CGIAR Breeding Programs
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Plant Molecular Biology Reporter
Abstract
The use of molecular markers allows for precise estimates of genetic diversity, which is an important parameter that enables
breeders to select parental lines and designing breeding systems. We assessed the level of genetic diversity and population
structure in a panel of 151 tropical maize inbred lines using 10,940 SNP (single nucleotide polymorphism) markers generated
through the DArTseq genotyping platform. The average gene diversity was 0.39 with expected heterozygosity ranging
from 0.00 to 0.84, and a mean of 0.02. Analysis of molecular variance showed that 97% of allelic diversity was attributed to
individual inbred lines within the populations while only 3% was distributed among the populations. Both neighbor-joining
clustering and STRU CTU RE analysis classified the inbred lines into four major groups. The crosses that involve inbred
lines from most divergent subgroups are expected to generate maximum heterosis and produce wide variation. The results
will be beneficial for breeders to better understand and exploit the genetic diversity available in the set of maize inbred lines
we studied.
Description
Keywords
Genetic diversity, Maize inbred lines, Population structure, SNP markers
Citation
Ayesiga, S. B., Rubaihayo, P., Oloka, B. M., Dramadri, I. O., Edema, R., & Sserumaga, J. P. (2022). Genetic Variation Among Tropical Maize Inbred Lines from NARS and CGIAR Breeding Programs. Plant Molecular Biology Reporter, 1-9. https://doi.org/10.1007/s11105-022-01358-2