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.
Faculty of Science, University of Zagreb, Department of Zoology, Croatia. goran@zg.biol.pmf.hr
Goran
G
Kovacević
Mirjana
M
Kalafatić
Nikola
N
Ljubesić
D000818:Animals; D048408:Chlorella vulgaris / Q000502:physiology / Q000648:ultrastructure; D017523:Croatia; D006829:Hydra / Q000502:physiology* / Q000648:ultrastructure; D013559:Symbiosis / Q000502:physiology