Capacity of Heterosigma akashiwo to utilize organic nitrogen
WANG Zhao-hui, YANG Xue, LIANG Yu
College of Life Science and Technology, Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
Abstract:In order to understand the environmental conditions of the bloom occurrence of Heterosigma akashiwo growth responses of H. akashiwo to various dissoved organic nitrogen (DON) sources were assayed in laboratory experiments. H. akashiwo could utilize several kinds of DON, rank order of maximum cell number was: threonine > urea > alanine > glutamic acid > NO3->glycine. The maximum cell number and the maximum specific growth rate (μmax) in the medium of threonine, urea, alanine, and glutamic acid were superior to those in NO3-medium, with the relative maximum cell number of 125%~253% compared to NO3- medium. However, H. akashiwo could not maitain effective growth in serine and uric acid medium. H. akashiwo could not endure N-free or P-free or both nutrient free conditions. The results suggested that the high capasity of H. akashiwo to utilize DON made it predominance in phytoplanton competition, and eutrophication and orginc pollution in coastal areas provide basic nutrient demands for its bloom occurrence.
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