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International Journal of Medicinal Mushrooms
IF: 1.423 5-Year IF: 1.525 SJR: 0.431 SNIP: 0.716 CiteScore™: 2.6

ISSN Print: 1521-9437
ISSN Online: 1940-4344

International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushrooms.2017024280
pages 817-827

Brown Mycelial Mat as an Essential Morphological Structure of the Shiitake Medicinal Mushroom Lentinus edodes (Agaricomycetes)

Elena Vetchinkina
Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov, Russia
Vladimir Gorshkov
Kazan Institute of Biochemistry and Biophysics, Kazan Science Center, Russian Academy of Sciences, Kazan, Russia; Kazan Federal University, Kazan, Russia
Marina Ageeva
Kazan Institute of Biochemistry and Biophysics, Kazan Science Center, Russian Academy of Sciences, Kazan, Russia
Yuri Gogolev
Kazan Institute of Biochemistry and Biophysics, Kazan Science Center, Russian Academy of Sciences, Kazan, Russia; Kazan Federal University, Kazan, Russia
Valentina E. Nikitina
Laboratory of Microbiology, Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov, Russia

ABSTRACT

We show here, to our knowledge for the first time, that the brown mycelial mat of the xylotrophic shiitake medicinal mushroom, Lentinus edodes, not only performs a protective function owing to significant changes in the ultrastructure (thickening of the cell wall, increased density, and pigmentation of the fungal hyphae) but also is a metabolically active stage in the development of the mushroom. The cells of this morphological structure exhibit repeated activation of expression of the genes lcc4, tir, exp1, chi, and exg1, coding for laccase, tyrosinase, a specific transcription factor, chitinase, and glucanase, which are required for fungal growth and morphogenesis. This study revealed the maximum activity of functionally important proteins with phenol oxidase and lectin activities, and the emergence of additional laccases, tyrosinases, and lectins, which are typical of only this stage of morphogenesis and have a regulatory function in the development and formation of fruiting bodies.


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