Variations of antioxidant efficiency and presence of endosymbiotic diatoms in the Antarctic porifera Haliclona dancoi.
The role of endosymbiotic diatoms as pro-oxidant stressors in porifera has been investigated in the Antarctic sponge Haliclona dancoi in which the presence of diatoms is influenced by marked seasonal variations during the austral summer. Both chlorophaeopigments and frustules were absent in sponge tissues sampled in early November at the beginning of the summer and increased from the mid of December with slightly shifted temporal trends. The efficiency of antioxidant defenses in the sponge showed a marked response to symbionts with clearly enhanced values corresponding to the peak of diatoms.
Regoli
F
F
Istituto Biologia e Genetica, Università Politecnica delle Marche, Via Ranieri Monte D'Ago, Ancona 60100, Italy. regoli@univpm.it
Nigro
M
M
Chierici
E
E
Cerrano
C
C
Schiapparelli
S
S
Totti
C
C
Bavestrello
G
G
D000704:Analysis of Variance; D000818:Animals; D000864:Antarctic Regions; D002374:Catalase / Q000096:biosynthesis; D003600:Cytosol / Q000378:metabolism; D017377:Diatoms; D004790:Enzyme Induction / Q000187:drug effects; D016166:Free Radical Scavengers / Q000378:metabolism*; D005978:Glutathione / Q000378:metabolism; D005980:Glutathione Reductase / Q000096:biosynthesis; D005982:Glutathione Transferase / Q000096:biosynthesis; D018384:Oxidative Stress / Q000187:drug effects*; D010860:Pigments, Biological / Q000378:metabolism; D011161:Porifera / Q000201:enzymology*; D017382:Reactive Oxygen Species / Q000633:toxicity*; D012621:Seasons; D013053:Spectrophotometry; D013482:Superoxide Dismutase / Q000096:biosynthesis; D013559:Symbiosis
D016166:Free Radical Scavengers; D010860:Pigments, Biological; D017382:Reactive Oxygen Species; D002374:Catalase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; D005982:Glutathione Transferase; D005978:Glutathione