Abstract
The Philippines is situated in the geographic region regarded as the center of diversity of banana and its wild relatives (Musa spp.). It holds the most extensive collection of B-genome germplasm in the world along with A-genome groups and several natural hybrids with A- and B-genome combinations. Management of this germplasm resource has relied immensely on identification using local names and morphological characters, and the extent of genetic diversity of the collection has not been achieved with molecular markers. A high-throughput and reliable genotyping method for banana and its relatives will facilitate germplasm management and support breeding initiatives toward a marker-based approach. Here, we developed a 1 K SNP genotyping panel based on filtering of high-quality genome-wide SNPs from the Musa Germplasm Information System and used it to assess the genetic diversity and population structure of 183 accessions from a Musa spp. germplasm collection containing Philippine and foreign accessions. Targeted GBS using SeqSNP™ technology generated 70,376,284 next-generation sequencing (NGS) reads with an average effective target SNP coverage of 340 × . Bioinformatics pipeline revealed 971 polymorphic SNPs containing 76.9% homozygous calls, 23.1% heterozygous calls and 4% with missing data. A final set of 952 SNPs detected 2,092 alleles. Pairwise genetic distance varied from 0.0021 to 0.3325 with most pairs of accessions distinguished with 250 to 300 loci. The SNP panel was able to detect seven (k = 7) genetically differentiated groups and its composition through Principal Component Analysis (PCA) with k-means clustering algorithm and Discriminant Analysis of Principal Components (DAPC). Accession-specific SNPs were also identified. The 1 K SNP panel effectively distinguishes between genomic groups and provides relatively good resolution of genome-wide nucleotide diversity of Musa spp. This panel is recommended for low-density genotyping for application in marker-assisted breeding and germplasm management, and could be further enhanced to increase marker density for other applications like genetic association and genomic selection in bananas.
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Data availability
The raw next-generation sequencing datasets generated and/or analyzed during the current study are publicly available in the DDBJ/ENA/GenBank database under BioProject Accession number PRJNA850853.
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Acknowledgements
We gratefully acknowledge the Institute of Plant Breeding, College of Agriculture and Food Science at the University of the Philippines Los Baños for the use of facilities, equipment, and human resources counterpart. We also thank Ronilo M. Bajaro, Rodelio R. Pia and Wilermie D. Hernandez for technical assistance. Finally, the principal author would like to acknowledge the UPLB Graduate School and her advisory committee Dr. Consorcia E. Reaño, National Scientist Dolores A. Ramirez, Dr. Fe M. Dela Cueva, Dr. Hayde F. Galvez and Dr. Antonio C. Laurena for their technical advice in the doctoral dissertation.
Funding
This research was supported by the Philippine Department of Agriculture—Biotechnology Program Office (DA-BIOTECH) through the project entitled “DA-BIOTECH-R1902: Fast-tracking the Development of BBTV-resistant Banana Cultivars through Modern Biotech Tools: Molecular Profiling toward Marker Development and Diagnostics (Phase I)”.
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RRG, FMDC and DVL conceived and designed the study. JSM, JDLN and GCL carried out the experimental work. RRG and DVL developed the SNP panel and performed data analysis and interpretation. MST and LSG managed the germplasm and supplied the plant materials. RRG, ANCM and DVL wrote the manuscript with input from all authors. DVL secured the project funds. All authors have approved the submission of this manuscript.
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Gardoce, R.R., Manohar, A.N.C., Mendoza, JV.S. et al. A novel SNP panel developed for targeted genotyping-by-sequencing (GBS) reveals genetic diversity and population structure of Musa spp. germplasm collection. Mol Genet Genomics 298, 857–869 (2023). https://doi.org/10.1007/s00438-023-02018-0
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DOI: https://doi.org/10.1007/s00438-023-02018-0