The paper describes anatomical and physiological features of photobionts and mycobionts in Bryoria forsteri
Olech & Bystrek, Caloplaca regalis (Vain.) Zahlbr., Cetraria aculeata (Schreb.) Fr., Ramalina terebrata Hook
f. & Taylor, Sphaerophorus globosus (Huds.) Vain. and Usnea antarctica Du Rietz, collected in the Antarctic
under varied weather conditions. Green algae from the genera Lobosphaera and Trebouxia were gathered in
depressions of the cortex under the more resistant mycobiont hyphae. In photobiont cells a large amount of highly
osmiophilic electron-dense PAS-negative material, lipid-like in character, was of particular interest. Similar
material also filled certain areas of the aerial apoplast. A star-shaped chromatophore with central and lateral
pyrenoids encompassed most of the photobiont protoplast in all the studied species. Regularly arranged thylakoids
with evenly widened lumina along their entire length and osmiophilic lipid droplets adhering to their
outer surfaces were visible within the pyrenoid. Inside the chloroplast, large protein inclusions tightly joined with
the thylakoids were observed. The mycobionts were closely attached to each other another and with the photobionts
by means of an outer osmiophilic wall layer, and formed intramural haustoria. Their protoplasts were
filled with PAS-positive polysaccharides and a large amount of lipid-like substances. The photobionts were physiologically
active and produced a large amount of electron-dense osmiophilic material, and PAS-positive starch
grains were visible around their pyrenoids in the thalli collected in different weather conditions. The permanent
reserves of nutritive materials deposited in the thalli enable these organisms to quickly begin and continue
indispensable physiological processes in the extreme Antarctic conditions.
Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies
Informacja
SZANOWNI CZYTELNICY!
UPRZEJMIE INFORMUJEMY, ŻE BIBLIOTEKA FUNKCJONUJE W NASTĘPUJĄCYCH GODZINACH:
Wypożyczalnia i Czytelnia Główna: poniedziałek – piątek od 9.00 do 19.00