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Combined Effects of Temperature and Nutrient Availability on Growth and Phlorotannin Concentration of the Brown Alga Sargassum patens (Fucales; Phaeophyceae)

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DOI: 10.4236/ajps.2013.412A2002    3,546 Downloads   4,931 Views   Citations

ABSTRACT

Global warming is predicted to affect plant-herbivore interactions. However, little is known about the effects of temperature on marine plant secondary chemistry and how these effects may impact plant-herbivore interactions. As marine macroalgae can become physiologically stressed due to warm water temperatures and nutrient-poor conditions during summer, we conducted a culture experiment to test the combined effects of temperature (10°C, 20°C, 30°C) and nutrient availability (seawater enriched with 25% PESI medium and non-enriched seawater) on relative growth rate (RGR) and concentration of phlorotannins (i.e., defensive compounds) in the upper and lower parts of shoots of the brown alga Sargassum patens. RGR was affected by temperature but not by nutrient availability. Phlorotannnin concentration was affected by nutrient availability but not by temperature, although there was a significant interaction between temperature and part of the shoots. Correlations between RGR and phlorotannin concentration were significant for the upper part of the shoots but not for the lower part. These correlations were slightly positive in the nutrient-enriched medium but negative in the non-enriched medium. These results suggest that temperature affects phlorotannin concentration of S. patens indirectly via changes in the growth rate and that its effect depends on the part of the shoot and nutrient availability.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

H. Endo, K. Suehiro, J. Kinoshita, X. Gao and Y. Agatsuma, "Combined Effects of Temperature and Nutrient Availability on Growth and Phlorotannin Concentration of the Brown Alga Sargassum patens (Fucales; Phaeophyceae)," American Journal of Plant Sciences, Vol. 4 No. 12B, 2013, pp. 14-20. doi: 10.4236/ajps.2013.412A2002.

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