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Association mapping of selected oil palm germplasm reveals novel and known genomic regions influencing vegetative and bunch component traits

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Abstract

A genome-wide association Study (GWAS) detects linkages between markers and traits of interest for application in genomics-guided breeding. This study utilized GWAS to identify quantitative trait loci (QTL) associated with important agronomic traits in selected palms from Malaysian Palm Oil Board’s (MPOB) African germplasm collection. A total of 635 African oil palm accessions from Angola, Madagascar, Nigeria, and Tanzania were genotyped using a 4451 Single Nucleotide Polymorphism (SNP) Chip via the Illumina platform. Subsequently, genetic diversity was analyzed using 1464 informative SNP markers, and the Angola germplasm was discovered to have the highest heterozygosity and, as expected, Madagascar the lowest. Population structure analysis revealed two main subpopulations, Madagascar versus the others (Angola, Nigeria, and Tanzania). Linkage disequilibrium (LD) analysis conducted using Haploview 4.2 suggested LD decay to be 1.9 kb at r2 = 0.1. Based on fixed and random model calculating probability unification (FarmCPU) analyses, 49 markers were significantly associated with 17 phenotypic traits, some located within the genomic regions associated with similar traits in other studies. QTL on chromosomes 6, 9, and 11 are common among the germplasm and advanced populations, thereby suggesting that the genomic region is selectively fixed in advanced breeding lines. This adds confidence to their potential utility in breeding programs to enhance selection efficiency and progress of the genetic improvement of a perennial crop like oil palm. Interestingly, protein STRUBBELIG-RECEPTOR family 6 and Beta-galactosidase 11 genes were also observed in the QTL intervals, which are potential candidates in expression studies to further dissect the genetic architecture of the traits.

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Data availability

The datasets generated from this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors would like to thank the Director-General of MPOB for permission to publish this paper. We also would like to express our appreciation to all the members of the Genomics unit, Breeding and Tissue Culture unit, and Bioinformatics unit for their technical support.

Funding

This study was fully funded by Malaysian Palm Oil Board (MPOB).

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Contributions

MI and RS conceived and design the study. NMS prepared the samples, analyzed the data, and wrote the manuscript. NSNMS provides the genetic map data. SM provides the phenotype data. JS, IM, RS, MMR, and MI reviewed and edited the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Maryam Mohamed Rehan or Maizura Ithnin.

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Serdari, N.M., Sanusi, N.S.N.M., Suzana, M. et al. Association mapping of selected oil palm germplasm reveals novel and known genomic regions influencing vegetative and bunch component traits. Genet Resour Crop Evol 71, 1709–1735 (2024). https://doi.org/10.1007/s10722-023-01723-4

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