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Amino Acid Content of Zooxanthellae Freshly Isolated from Pocillopora damicornis

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Title:Amino Acid Content of Zooxanthellae Freshly Isolated from Pocillopora damicornis
Authors:McAuley, P.J.
Date Issued:Jul 1994
Publisher:University of Hawaii Press
Citation:McAuley PJ. 1994. Amino acid content of zooxanthellae freshly isolated from Pocillopora damicornis. Pac Sci 48(3): 247-253.
Abstract:Total amino-N content and glutamine to glutamate ratios
(gln: glu) were determined in zooxanthellae freshly isolated from colonies of
the coral Pocillopora damicornis (Linnaeus) incubated in ambient seawater or in
seawater supplemented with ammonium to give a final concentration of 20 or
50 uM. Addition of ammonium did not change total amino-N content but did
increase gln: glu from 0.25 to 0.47-0.48, suggesting that ammonium was directly
utilized by the symbiotic zooxanthellae. Gln: glu in zooxanthellae from
corals maintained in seawater "stripped" of ammonium fell to 0.18. Sizes of
pools of most free amino acids in zooxanthellae from P. damicornis were
roughly two to five times those of zooxanthellae from the temperate sea
anenome Anemonia viridis, but the latter, which is not believed to be N-limited,
exhibited higher gln: glu ratios. These data indicate that gln: glu is a sensitive
measure of the response of symbiotic zooxanthellae to exogenous dissolved
nitrogen, but despite an increase in gln: glu when seawater is supplemented
with ammonium, it cannot be concluded that individual zooxanthellae are
normally N-limited.
Appears in Collections: Pacific Science Volume 48, Number 3, 1994

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