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RISS 인기검색어
- 검색키워드
- 저자 : Ewa Sajnaga (검색결과 2 건)
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Envelope development and variation in Trachelomonas hispida (Euglenophyta)
Małgorzata Poniewozik,Emil Zięba,Ewa Sajnaga 한국조류학회I 2018 ALGAE Vol.33 No.4
In Trachelomonas hispida, the adult envelope that surrounds the monad is oval in shape and covered with spines. Developmentof the lorica is an interesting, but poorly known phenomenon. We observed in detail the formation of spinelessenvelopes of T. hispida using light microscopy and scanning electron microscopy. The results showed that youngcells formed delicate and net-like envelopes. The structure changed with age, and mature specimens had solid, thick loricaewith small pores. As the loricae aged, they changed their shape, and rope-like fibres from the external layer startedto unwind, progressing from the apical pore, exposing the underlying net-like structure. X-ray spectrometry showed thatFe was the major mineral component in young and mature loricae, whereas old loricae did not contain Fe salts, althoughthey did contain a high number of Mn compounds. We also noticed a different pattern of mineralization process in theenvelopes. Apart from the even distribution of mineral deposition over the entire lorica, we observed that it started fromthe apical pore and ended at the posterior end. There was considerable morphological variation in envelope shape andornamentation, which had collars and folds around the apical pore and process at the posterior end. This suggested thatmany varieties of T. hispida should be taxonomically reappraised. We also discuss a hypothetical role for the spines onlorica surfaces in aquatic ecosystems.
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Envelope development and variation in Trachelomonas hispida (Euglenophyta)
Poniewozik, Malgorzata,Zieba, Emil,Sajnaga, Ewa The Korean Society of Phycology 2018 ALGAE Vol.33 No.4
In Trachelomonas hispida, the adult envelope that surrounds the monad is oval in shape and covered with spines. Development of the lorica is an interesting, but poorly known phenomenon. We observed in detail the formation of spineless envelopes of T. hispida using light microscopy and scanning electron microscopy. The results showed that young cells formed delicate and net-like envelopes. The structure changed with age, and mature specimens had solid, thick loricae with small pores. As the loricae aged, they changed their shape, and rope-like fibres from the external layer started to unwind, progressing from the apical pore, exposing the underlying net-like structure. X-ray spectrometry showed that Fe was the major mineral component in young and mature loricae, whereas old loricae did not contain Fe salts, although they did contain a high number of Mn compounds. We also noticed a different pattern of mineralization process in the envelopes. Apart from the even distribution of mineral deposition over the entire lorica, we observed that it started from the apical pore and ended at the posterior end. There was considerable morphological variation in envelope shape and ornamentation, which had collars and folds around the apical pore and process at the posterior end. This suggested that many varieties of T. hispida should be taxonomically reappraised. We also discuss a hypothetical role for the spines on lorica surfaces in aquatic ecosystems.
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