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Are free amino acids responsible for the “host factor” effects on symbiotic zooxanthellae in extracts of host tissue?
| Title: | Are free amino acids responsible for the “host factor” effects on symbiotic zooxanthellae in extracts of host tissue?. |
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| Name(s): | Cook, Clayton B., creator | |
| Type of Resource: | text | |
| Genre: | Article | |
| Issuance: | single unit | |
| Date Issued: | 2001 | |
| Publisher: | Kluwer Academic Publishers | |
| Extent: | 9 p. | |
| Physical Description: | ||
| Language(s): | English | |
| Identifier: | 2783225 (digitool), FADT2783225 (IID), fau:5520 (fedora), 10.1023/A:1012785725378 (doi) | |
| Note(s): |
Symbiotic dinoflagellates (‘zooxanthellae’) typically release short-term photosynthetic products and have enhanced photosynthesis when exposed to extracts of host tissue. Published evidence has indicated that free amino acids (FAA) at concentrations exceeding 40 mMare responsible for these ‘host factor’ effects on zooxanthellae from sea anemones and corals. We have compared the ninhydrin-positive FAA concentrations of extracts of the symbiotic sea anemone Aiptasia pallida with their efficacy in eliciting these responses and found little effect on carbon release by freshly isolated A. pallida symbionts at concentrations up to 0.6 mM, the highest concentration of our samples. Extracts of the coral Montastraea annularis induced release from these algae at less than 0.1 mM FAA, but there was no correlation between total ninhydrin-positive FAA concentration and ‘host factor’ activity. However, all of these preparations stimulated photosynthesis. We tested a range of concentrations (≤50 mM) of glycine, alanine and glutamic acid with the isolated A. pallida symbionts. There was a significant increase in the release of fixed carbon with increasing alanine concentrations, but not with the other two amino acids. There were no effects on photosynthesis. Our observations support other reports indicating that other compounds , or specific amino acids such as taurine and the mycosporine-like amino acids, are responsible for ‘host factor’ effects. This manuscript is a version of an article with the final publication found online at http://www.springerlink.com and may be cited as: Cook, Clayton B. and Simon K. Davy (2001) Are free amino acids responsible for the ‘host factor’ effects on symbiotic zooxanthellae in extracts of host tissue? Marine Biology 461:71–78 DOI: 10.1023/A:1012785725378 Florida Atlantic University. Harbor Branch Oceanographic Institute contribution #1420. |
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| Subject(s): |
Dinoflagellates --Physiology Amino acids Zooxanthella Marine biology |
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| Persistent Link to This Record: | http://purl.flvc.org/FCLA/DT/2783225 | |
| Links: | http://dx.doi.org/10.1023/A:1012785725378 | |
| Restrictions on Access: | ©2001 Kluwer Academic Publishers. | |
| Host Institution: | FAU |
