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Article title

Specific ultrastructure of the leaf mesophyll cells of Deschampsia antarctica Desv. (Poaceae)

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Przy użyciu standardowej metody przygotowywania materiału, badano ultrastrukturę komórek mezofilu liści Deschampsia antarctica Desv. (Poaceae) w mikroskopie elektronowym transmisyjnym (TEM). Badane liście zostały zebrane z okazów śmiałka antarktycznego rosnącego w mikrośrodowisku tundrowym, reprezentujących kseromorficzne cechy morfologiczne i anatomiczne. Ogólne cechy anatomiczne komórek mezofilu są podobne do komórek liści innych traw. Obserwacjeultrastruktury komórek wykazały, że organelle komórek mezofilowych występują blisko siebie w stosunkowo niewielkiej ilości cytoplazmy lub ściśle przylegają do siebie. Organelle takie jak mitochondria, peroksysomy, aparaty Golgiego, a także osmofilne materiały gromadzą się w pobliżu chloroplastów. Chloroplasty komórek mezofilu D. antarctica często mają wklęsłości wypełnione cytoplazmą. Takie zachowanie i budowa ultrastrukturalna organelli ułatwia wymianę/przepływ różnych substancji zaangażowanych w aktywność metaboliczną między współdziałającymi organellami komórki.
The ultrastucture of mesophyll cells of Deschampsia antarctica Desv. (Poaceae) leaves was investigated using the standard method of preparing material for examination in transmission electron microscopy (TEM). The investigated leaves were collected from the Antarctic hairgrass growing in a tundra microhabitat and representing xermorphic morphological and anatomical features. The general anatomical features of mesophyll cells are similar to those in cells of another grass leaves. The observations of the ultrastructure of mesophyll cells have shown that the organelles are located close to each other in a relatively small amount of the cytoplasm or closely adhere to each other. Organelles such as mitochondria, peroxisomes, and Golgi apparatus, as well as osmiophilic materials are gathered close to the chloroplasts. The chloroplast of the mesophyll cells of the D. antarctica leaf can form concavities filled with the cytoplasm. Such behaviour and ultrastructure of organelles facilitate exchange/flow of different substances engaged in the metabolic activity of the cell between cooperating organelles.
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18 - 07 - 2015
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