The Effects of NO3− Supply on Mazzaella laminarioides (Rhodophyta, Gigartinales) from Southern Chile
The effects of nitrate supply on growth, pigments, mycosporine‐like amino acids (MAAs), C:N ratios and carrageenan yield were investigated in Mazzaella laminarioides cultivated under solar radiation. This species is economically important in southern Chile where an increase of nitrogen in coastal wa...
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Published in | Photochemistry and photobiology Vol. 90; no. 6; pp. 1299 - 1307 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Blackwell Publishing Ltd
01.11.2014
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Subjects | |
Online Access | Get full text |
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Summary: | The effects of nitrate supply on growth, pigments, mycosporine‐like amino acids (MAAs), C:N ratios and carrageenan yield were investigated in Mazzaella laminarioides cultivated under solar radiation. This species is economically important in southern Chile where an increase of nitrogen in coastal waters is expected as a consequence of salmon aquaculture activity. Apical segments were cultivated in enriched seawater with five different NO3− concentrations (0, 0.09, 0.18, 0.38 and 0.75 mm) during 18 days. Although phycoerythrin and phycocyanin content, as well as C:N ratios, were reduced in the control treatment (without NO3− supply), when compared to NO3− treatments, total MAA concentration, carrageenan yield and growth rates were similar in all tested conditions. Nevertheless, during the experiment, an important synthesis of mycosporine‐glycine took place in a nitrate concentration‐dependent manner, with accumulation being saturated around 0.18 mm of nitrate. These results indicate that exposure to high NO3− concentration of more than 100 times the values observed in the nature did not impair the photoprotection system, as determined by MAAs, nor did it have a deleterious effect on growth or carrageenan yield of M. laminarioides, a late successional species from Chile.
The effect of NO3− on Mazzaella laminarioides was evident by the preferential accumulation of mycosporine‐glycine, rather than total MAAs. The fact that mycosporine‐glycine, but not total MAAs, was increased could have resulted from interconversions among different MAAs. Synthesis and accumulation of compounds with antioxidant activities, such as mycosporine‐glycine, could play an important ecological role. |
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Bibliography: | Spanish and Andalusian governments - No. CGL08-05407 C03-01; No. RNM5750 istex:803D4A7950DBBEB2525264A06440ABC74A398D11 ark:/67375/WNG-9RKJDJPV-K DICTY Universidad de Santiago de Chile ArticleID:PHP12344 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0031-8655 1751-1097 |
DOI: | 10.1111/php.12344 |