Abstract
Key message
From 61 QTL mapped, a stable QTL cluster of 992 kb was discovered on chromosome 5 for folate content and a putative candidate gene, Glyma.05G237500, was identified.
Abstract
Folate (vitamin B9) is one of the most essential micronutrients whose deficiencies lead to various health defects in humans. Herein, we mapped the quantitative trait loci (QTL) underlying seed folate content in soybean using recombinant inbred lines developed from cultivars, ZH35 and ZH13, across four environments. We identified 61 QTL on 12 chromosomes through composite interval mapping, with phenotypic variance values ranging from 1.68 to 24.68%. A major-effect QTL cluster (qFo-05) was found on chromosome 5, spanning 992 kb and containing 134 genes. Through gene annotation and single-locus haplotyping analysis of qFo-05 in a natural soybean population, we identified seven candidate genes significantly associated with 5MTHF and total folate content in multiple environments. RNA-seq analysis showed a unique expression pattern of a hemerythrin RING zinc finger gene, Glyma.05G237500, between both parental cultivars during seed development, which suggest the gene might regulate folate content in soybean. This is the first study to investigate QTL underlying folate content in soybean and provides new insight for molecular breeding to improve folate content in soybean.
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Data availability
The raw sequence data for RNA-seq reported in this paper have been deposited in the Genome Sequence Archive (Genomics, Proteomics & Bioinformatics 2021) at the National Genomics Data Center (Nucleic Acids Res 2022), China National Center for Bioinformation / Beijing Institute of Genomics, Chinese Academy of Sciences (GSA: CRA008483) that are publicly accessible at https://ngdc.cncb.ac.cn/gsa. The SNPs used for the single locus haplotyping of candidate genes in qFo-05 and for haplotype analysis of missense variants in Glyma.05G237500 were downloaded from the Soybean Functional Genomics & Breeding database (SoyFGB v2.0) (https://sfgb.rmbreeding.cn/).
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Acknowledgements
The authors would like to thank all and sundry who contributed their time and effort to this study.
Funding
This work was supported by the Ministry of Science and Technology (2021YFD1201605), National Natural Science Foundation of China (32161143033, 32272178 and 32001574), and CAAS (Chinese Academy of Agricultural Sciences) Agricultural Science and Technology Innovation Project (2060302–2).
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KGAB, SZ and RG contributed to the formal analysis, investigation; methodology, software, writing—original draft, review and editing and data curation. SZ, JQ, MA, CM, YL, MA, YF, HF, YL, and JL were involved in the investigation and methodology. LB, LQ and JS assisted in the conceptualisation, funding acquisition, project administration, supervision, resources, writing—review and editing.
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Fig. S1. Genetic linkage map of RIL population derived between ZH35 and ZH13. Fig. S2. Conserved protein domains of Glyma.05G237500 with homologs of other legumes and Arabidopsis. Table S1. Information on the linkage group of the RIL population derived from ZH35 and ZH13. Table S3. Protein sequences of candidate gene, Glyma.05G237500 and its homologs in other plants. Table S4. Folate content of parents, ZH35 and ZH13 across different environments. Table S5. QTL for soybean folate monoglutamates in RIL population across four environments. Table S6. List of gene models identified in qFo-05. Table S7. List of predicted transcription factors in qFo-05. Table S8. Seven genes with significant loci for 5MTHF and total folate across four environments. Table S9. Gene annotation of candidate genes. Table S10. Expression in transcripts per million (TPM) of candidate genes for parents, ZH35 and ZH13, during seed development. Table S11. Folate contents (µg/100g DW) of ZH13 at different stages of seed development. Sampling times, S1-S7, represent the different sampling time points in sequential order, from the beginning of seed filling to final maturity. Table S13. Modifier SNP and InDel variants in the promoter region of Glyma.05G237500. Table S14. Genotype and phenotype data of RIL population used in this study.
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Agyenim-Boateng, K.G., Zhang, S., Gu, R. et al. Identification of quantitative trait loci and candidate genes for seed folate content in soybean. Theor Appl Genet 136, 149 (2023). https://doi.org/10.1007/s00122-023-04396-w
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DOI: https://doi.org/10.1007/s00122-023-04396-w