New observations on green hydra symbiosis.
New observations on green hydra symbiosis are described. Herbicide norflurazon was chosen as a "trigger" for analysis of these observations. Green hydra (Hydra viridissima Pallas, 1766) is a typical example of endosymbiosis. In its gastrodermal myoeptihelial cells it contains individuals of Chlorella vulgaris Beij. (KESSLER & HUSS 1992). Ultrastructural changes were observed by means of TEM. The newly described morphological features of green hydra symbiosis included a widening of the perialgal space, missing symbiosomes and joining of the existing perialgal spaces. Also, on the basis of the newly described mechanisms, the recovery of green hydra after a period of intoxication was explained. The final result of the disturbed symbiosis between hydra and algae was the reassembly of the endosymbiosis in surviving individuals.
Kovacević
Goran
G
Faculty of Science, University of Zagreb, Department of Zoology, Croatia. goran@zg.biol.pmf.hr
Kalafatić
Mirjana
M
Ljubesić
Nikola
N
D000818:Animals; D048408:Chlorella vulgaris / Q000502:physiology / Q000648:ultrastructure; D017523:Croatia; D006829:Hydra / Q000502:physiology* / Q000648:ultrastructure; D013559:Symbiosis / Q000502:physiology