Diversity of A mating type in Lentinula edodes and mating type preference in the cultivated strains

Byeongsuk Ha; Sinil Kim; Minseek Kim; Yoon Jung Moon; Yelin Song; Jae-San Ryu; Hojin Ryu; Hyeon-Su Ro

doi:10.1007/s12275-018-8030-6

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Diversity of A mating type in Lentinula edodes and mating type preference in the cultivated strains: Byeongsuk Ha ¹, Sinil Kim ¹, Minseek Kim ¹, Yoon Jung Moon ¹, Yelin Song ¹, Jae-San Ryu ², Hojin Ryu ³, Hyeon-Su Ro ^1,4; Journal of Microbiology 2018;56(6):416-425.
DOI: https://doi.org/10.1007/s12275-018-8030-6
Published online: June 1, 2018

¹Division of Applied Life Science and Research Institute of Life Sciences, Gyeongsang National University, Jinju 52828, Republic of Korea, ²Department of Mushroom, Korea National College of Agriculture and Fisheries, Jeonju 54874, Republic of Korea, ³Department of Biology, Chungbuk National University, Cheongju 28644, Republic of Korea, ⁴Division of Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea¹Division of Applied Life Science and Research Institute of Life Sciences, Gyeongsang National University, Jinju 52828, Republic of Korea, ²Department of Mushroom, Korea National College of Agriculture and Fisheries, Jeonju 54874, Republic of Korea, ³Department of Biology, Chungbuk National University, Cheongju 28644, Republic of Korea, ⁴Division of Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea

Corresponding author: Hyeon-Su Ro , Tel: +82-55-772-1328;,

Received: 22 January 2018 • Revised: 2 April 2018 • Accepted: 12 April 2018

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Abstract

Diversity of A mating type in Lentinula edodes has been assessed by analysis of A mating loci in 127 strains collected from East Asia. It was discovered that hypervariable sequence region with an approximate length of 1 kb in the A mating locus, spanning 5􍿁􀁇region of HD2-intergenic region-5􍿁􀁇region of HD1, could represent individual A mating type as evidenced by comprehensive mating analysis. The sequence analysis revealed 27 A mating type alleles from 96 cultivated strains and 48 alleles from 31 wild strains. Twelve of them commonly appeared, leaving 63 unique A mating type alleles. It was also revealed that only a few A mating type alleles such as A1, A4, A5, and A7 were prevalent in the cultivated strains, accounting for 62.5% of all A mating types. This implies preferred selection of certain A mating types in the process of strain development and suggests potential role of A mating genes in the expression of genes governing mushroom quality. Dominant expression of an A mating gene HD1 was observed from A1 mating locus, the most prevalent A allele, in A1-containing dikaryons. However, connections between HD1 expression and A1 preference in the cultivated strains remain to be verified. The A mating type was highly diverse in the wild strains. Thirty-six unique A alleles were discovered from relatively small and confined area of mountainous region in Korean peninsula. The number will further increase because no A allele has been recurrently observed in the wild strains and thus newly discovered strain will have good chances to contain new A allele. The high diversity in small area also suggests that the A mating locus has evolved rapidly and thus its diversity will further increase.

Keywords: diversity;lentinula;mating;nucleus;preference

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Diversity of A mating type in Lentinula edodes and mating type preference in the cultivated strains

J. Microbiol. 2018;56(6):416-425. Published online June 1, 2018

DOI: https://doi.org/10.1007/s12275-018-8030-6

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