title: Ultrastructural changes in the mycelium of Hericium erinaceum (Bull.; Fr.) Pers. under selenium-induced oxidative stress.
abstract: BACKGROUND
  In this study we examined the influence of various forms of selenium (organic and inorganic) on the vivacity of Hericium erinaceum mycelium and structural changes and ultrastructure occurring during its development in submerged culture.
  
  
  RESULTS
  The mycelium was grown on sodium selenite (Na₂SeO₃), Selol (with 20 and 50 g kg⁻¹ Se, respectively) and a mixture of Na₂SeO₃ and Selol. Samples of the mycelium were collected on day 3 and day 24 of the incubation and viewed under an electron microscope. Selol at concentration 20 g kg⁻¹ did not cause any damage to the cell ultrastructure, but it contributed to the thickening of the cell wall, which implied an influence on polysaccharide production. In the other cases, degradation changes appeared in the protoplasm and the thickness of the cell wall did not increase.
  
  
  CONCLUSIONS
  The nature of the effect exerted by various sources of selenium in the culture medium on the formation of polysaccharides probably results from the differences in their chemical composition and differences in the toxicity of these compounds towards the cells, but is also connected with the decomposition of the wall surrounding degraded fungal cells.
authors: Department of Ecology and Environmental Protection, Jan Kochanowski University, 25-406, Kielce, Poland.
authors: Joanna
authors: J
authors: Ślusarczyk
authors: Mieczysław
authors: M
authors: Kuraś
authors: Eliza
authors: E
authors: Malinowska
authors: Krystyna
authors: K
authors: Skalicka-Woźniak
authors: Kazimierz
authors: K
authors: Głowniak
mesh_terms: D001487:Basidiomycota / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D002473:Cell Wall / Q000378:metabolism / Q000648:ultrastructure; D003593:Cytoplasm / Q000378:metabolism / Q000648:ultrastructure; D019587:Dietary Supplements / Q000009:adverse effects; D063427:Food Quality; D005527:Food, Fortified / Q000009:adverse effects; D062610:Fungal Polysaccharides / Q000096:biosynthesis; D006868:Hydrolysis; D050296:Microbial Viability; D046529:Microscopy, Electron, Transmission; D025282:Mycelium / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D018384:Oxidative Stress; D011044:Poland; D018036:Selenium Compounds / Q000009:adverse effects / Q000378:metabolism*; D018038:Sodium Selenite / Q000009:adverse effects / Q000378:metabolism*
chemical_list: D062610:Fungal Polysaccharides; D018036:Selenium Compounds; C105370:selol; D018038:Sodium Selenite
keywords: Hericium erinaceum; Selol; polysaccharides; sodium selenite; ultrastructure of fungal cell