The Effects of NO3− Supply on Mazzaella laminarioides (Rhodophyta, Gigartinales) from Southern Chile. (30th October 2014)

• Record Type: Journal Article
• Authors: Navarro, Nelso P.; Figueroa, Félix L.; Korbee, Nathalie; Mansilla, Andrés; Matsuhiro, Betty; Barahona, Tamara; Plastino, Estela M.
• Is Part Of: Photochemistry and photobiology. Volume 90:Number 6(2014:Nov./Dec.)
• Page Start: 1299
• Page End: 1307
• Publication Date: 2014-10-30
• Subjects: Photochemistry -- Periodicals; Light -- Physiological effect -- Periodicals; 541.35
• DOI: 10.1111/php.12344
• Languages: English
• ISSNs: 0031-8655

Abstract

<abstract abstract-type="main" id="php12344-abs-0001"> <title>Abstract</title> <p>The effects of nitrate supply on growth, pigments, mycosporine‐like amino acids (MAAs), C:N ratios and carrageenan yield were investigated in <italic>Mazzaella laminarioides</italic> 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 <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh2cqjrcv4" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:00318655:media:php12344:php12344-math-0002" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>NO</mml:mtext><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mo>−</mml:mo></mml:msubsup></mml:math></alternatives></inline-formula> concentrations (0, 0.09, 0.18, 0.38 and 0.75 m<sc>m</sc>) during 18 days. Although phycoerythrin and phycocyanin content, as well as C:N ratios, were reduced in the control treatment (without <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh2cqjrcwp" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:00318655:media:php12344:php12344-math-0003" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>NO</mml:mtext><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mo>−</mml:mo></mml:msubsup></mml:math></alternatives></inline-formula> supply), when compared to <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh2cqjrcx7" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:00318655:media:php12344:php12344-math-0004" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>NO</mml:mtext><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mo>−</mml:mo></mml:msubsup></mml:math></alternatives></inline-formula> 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 m<sc>m</sc> of nitrate. These results indicate that exposure to high <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh2cqjrczs" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:00318655:media:php12344:php12344-math-0005" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mtext>NO</mml:mtext><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mo>−</mml:mo></mml:msubsup></mml:math></alternatives></inline-formula> 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 <italic>M. laminarioides</italic>, a late successional species from Chile.</p> </abstract>