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A SNP-based high-density linkage map of zoysiagrass (Zoysia japonica Steud.) and its use for the identification of QTL associated with winter hardiness

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Abstract

Zoysia japonica Steud. (2n = 4× = 40) is a C4 turfgrass well-adapted for the warm-humid and transitional climatic zones of the USA. Its use is limited to warmer climates because of a relative lack of winter hardiness compared to C3 grasses. Molecular markers associated with this trait would be useful for effective selection of winter hardy germplasm before field testing. A pseudo-F2 mapping population of 175 individuals was developed from crosses between Z. japonica cultivars “Meyer” (freeze-tolerant) and “Victoria” (freeze-susceptible) and used to generate a high-density genetic map of 104 SSR markers and 2359 sequencing-derived SNP markers. The map covers 324 Mbp and 2520 cM as well as the 20 chromosomes for the zoysiagrass haploid genome. Phenotypic data on winter injury, establishment, and turf quality collected in North Carolina and Indiana in 2014–2016 were used in conjunction with this map to identify quantitative trait loci (QTL) associated with winter hardiness. Fifty-six QTL associated with winter injury, establishment, and turf quality were identified over six environments. Twelve of those were identified in two or more environments. Furthermore, seven regions of interest were identified on chromosomes 8, 11, and 13 where co-location of QTL for three or more traits occurred. Within these regions, analysis with NCBI basic local alignment search tool (BLAST) identified proteins related to cold and other abiotic stresses tolerance. These QTL and associated markers could be valuable in implementing marker-assisted selection for winter hardiness in zoysiagrass breeding programs.

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Acknowledgements

The authors would like to thank the personnel at the Upper Mountain Research Station (Laurel Springs, NC) and the William H. Daniel Turfgrass Research and Diagnostic Center (West Lafayette, IN) for the help in maintaining research plots. The authors would also like to thank the NCSU Genomic Sciences Laboratory for generation and assembly of zoysiagrass sequencing data. This research was supported in part with funding provided by the North Carolina State University Plant Breeding Consortium, the NCSU Center for Turfgrass Environmental Research and Education, and the United States Golf Association.

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Correspondence to Susana R. Milla-Lewis.

Electronic supplementary material

Supplementary Table 1

Analysis of variance for winter injury, establishment, pre-freeze turf quality, and post-freeze turf quality in the Meyer × Victoria mapping population in Laurel Springs, NC and West Lafayette, IN environments from 2014 – 2016 (DOCX 12.9 kb)

Supplementary Table 2

Phenotypic correlations between winter injury, establishment, pre-freeze turf quality, and post-freeze turf quality evaluated in a Meyer × Victoria zoysiagrass mapping population at Laurel Springs, NC and West Lafayette, IN from 2014 – 2016 (DOCX 12.1 kb)

Supplementary Table 3

Single nucleotide polymorphism (SNP) and simple sequence repeat (SSR) marker distribution and coverage in the Meyer × Victoria mapping population. These markers cover all 20 Zoysia japonica chromosomes, totaling 2,463 markers, 324 Mbp and 2520 cM (DOCX 13.6 kb)

Supplementary Table 4

All QTL for zoysiagrass winter injury, establishment, pre-freeze turf quality, and post-freeze turf quality in environments in Laurel Spring, NC and West Lafayette, IN and the combined environments. All QTL were detected at a LOD threshold of 3.5 (DOCX 19.0 kb)

Supplementary Table 5

Distribution of QTL for zoysiagrass winter injury, establishment, pre-freeze turf quality, and post-freeze turf quality in environments in Laurel Spring, NC and West Lafayette, IN and the combined environments over the 20 chromosomes of the Z. japonica map. All QTL were detected at a LOD threshold of 3.5 (DOCX 13.8 kb)

Supplementary Table 6

QTL for zoysiagrass winter injury, establishment, pre-freeze turf quality, and post-freeze turf quality identified in two or more environments in Laurel Spring, NC and West Lafayette, IN or combined environments (DOCX 15.5 kb)

Supplementary Table 7

Annotated sequences identified using the NCBI’s basic local alignment search tool (BLAST) in regions on Z. japonica chromosomes 8, 11, and 13. These regions of interest on were examined using the BLASTx program, and protein coding sequences were identified in all of these regions with total score > 200, E values <10-20, and at least two BLAST hits (DOCX 35.2 kb)

Supplementary Figure 1

Physical map of 2359 SNP markers and 104 SSR markers covering 324 Mbp over the 20 chromosomes of the zoysiagrass genome. Positions (kbp) with multiple markers are condensed to single position (color reference) for better visualization. This condensed map contains 1008 markers (JPEG 155 kb)

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Holloway, H.M.P., Yu, X., Dunne, J.C. et al. A SNP-based high-density linkage map of zoysiagrass (Zoysia japonica Steud.) and its use for the identification of QTL associated with winter hardiness. Mol Breeding 38, 10 (2018). https://doi.org/10.1007/s11032-017-0763-0

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