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A comparative ultrastructure study of storage cells in the eutardigrade Richtersius coronifer in the hydrated state and after desiccation and heating stress
Kristianstad University, Faculty of Natural Science, Research environment Man & Biosphere Health (MABH). Kristianstad University, Faculty of Natural Science, Avdelningen för miljö- och biovetenskap. Charles University, Prague.
Poland.
Poland.
Kristianstad University, Faculty of Natural Science, Research environment Man & Biosphere Health (MABH). Kristianstad University, Faculty of Natural Science, Avdelningen för miljö- och biovetenskap.ORCID iD: 0000-0002-1732-0372
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2018 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 8Article in journal (Refereed) Published
Abstract [en]

Tardigrades represent an invertebrate phylum with no circulatory or respiratory system.Their body cavity is filled with free storage cells of the coelomocyte-type, which are responsible for important physiological functions. We report a study comparing the ultrastructure of storage cells in anhydrobiotic and hydrated specimens of the eutardigrade Richtersius coronifer. We also analysed the effect of temperature stress on storage cell structure. Firstly, we verified two types of ultrastructurally different storage cells, which differ in cellular organelle complexity, amount and content of reserve material and connection to oogenetic stage. Type I cells were found to differ ultrastructurally depending on the oogenetic stage of the animal. The main function of these cells is energy storage. Storage cells of Type I were also observed in the single male that was found among the analysed specimens. The second cell type, Type II, found only in females, represents young undifferentiated cells, possibly stem cells. The two types of cells also differ with respect to the presence of nucleolar vacuoles,which are related to oogenetic stages and to changes in nucleolic activity during oogenesis. Secondly, this study revealed that storage cells are not ultrastructurally affected by six months of desiccation or by heating following this desiccation period. However, heating of the desiccated animals (tuns) tended to reduce animal survival, indicating that longterm desiccation makes these animals more vulnerable to heat stress. We confirmed the degradative pathways during the rehydration process after desiccation and heat stress. Our study is the first to document two ultrastructurally different types of storage cells in tardigrades and reveals new perspectives for further studies of tardigrade storage cells.

Place, publisher, year, edition, pages
2018. Vol. 13, no 8
Keywords [en]
tardigrades, Richtersius coronifer, storage cells, ultrastructure
National Category
Zoology
Identifiers
URN: urn:nbn:se:hkr:diva-18475DOI: 10.1371/journal.pone.0201430ISI: 000441308500017OAI: oai:DiVA.org:hkr-18475DiVA, id: diva2:1238053
Available from: 2018-08-11 Created: 2018-08-11 Last updated: 2018-08-30Bibliographically approved

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Publisher's full textCzernekova et al. 2018_PLOS ONE

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Jönsson, K. Ingemar
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Research environment Man & Biosphere Health (MABH)Avdelningen för miljö- och biovetenskap
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