Mycobiology

The Korean Society of Mycology (한국균학회)
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SNP-Based Genetic Linkage Map and Quantitative Trait Locus Mapping Associated with the Agronomically Important Traits of Hypsizygus marmoreus

  • Oh, Youn-Lee (Mushroom Science Division, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Choi, In-Geol (Department of Biotechnology, College of Life Science and Biotechnology, Korea University) ;
  • Jang, Kab-Yeul (Mushroom Science Division, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Kim, Min-Seek (Mushroom Science Division, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Oh, Min ji (Mushroom Science Division, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Im, Ji-Hoon (Mushroom Science Division, National Institute of Horticultural and Herbal Science, Rural Development Administration)
  • Received : 2021.08.30
  • Accepted : 2021.12.10
  • Published : 2021.12.31
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Abstract

White strains of Hypsizygus marmoreus are more difficult to cultivate than are brown strains; therefore, new white strain breeding strategies are required. Accordingly, we constructed the genetic map of H. marmoreus with 1996 SNP markers on 11 linkage groups (LGs) spanning 1380.49 cM. Prior to analysis, 82 backcrossed strains (HM8 lines) were generated by mating between KMCC03106-31 and the progenies of the F1 hybrid (Hami-18 × KMCC03106-93). Using HM8, the first 23 quantitative trait loci (QTLs) of yield-related traits were detected with high limit of detection (LOD) scores (1.98-9.86). The length, thickness, and hardness of the stipe were colocated on LG 1. Especially, length of stipe and thickness of stipe were highly correlated given that the correlation coefficients were negative (-0.39, p value ≤ .01). And a typical biomodal distribution was observed for lightness of the pileus and the lightness of the pileus trait belonged to the LG 8, as did traits of earliness and mycelial growth in potato dextrose agar (PDA) medium. Therefore, results for color traits can be suggested that color is controlled by a multi-gene of one locus. The yield trait was highly negatively correlated with the traits for thickness of the stipe (-0.45, p value ≤ .01). Based on additive effects, the white strain was confirmed as recessive; however, traits of mycelial growth, lightness, and quality were inherited by backcrossed HM8 lines. This new genetic map, finely mapped QTLs, and the strong selection markers could be used in molecular breeding of H. marmoreus.

Keywords

Acknowledgement

This project, titled "Development of new mushroom cultivars for export to expand the mushroom market" was funded by the Rural Development Administration [PJ01419601], Republic of Korea.

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