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Volume 34 Issue 3
May  2015
Article Contents

Citation:

Capacity of Heterosigma akashiwo to utilize organic nitrogen

  • Received Date: 2014-02-26
    Accepted Date: 2014-04-29
  • 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 (max) 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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  • [1] 王年斌,周遵春,马志强,等.大连湾赤潮异弯藻赤潮的多元分析[J].海洋学报,2006,28(3):151-156.[9]尹翠玲,张秋丰,胡延忠,等.2006年夏季渤海湾赤潮重点监控区的赤潮生物[J].海洋湖沼通报,2008(1):114-119.[11]GUILLARD R R L.Division rates[M]//STEIN J R.Handbook of phycological methods:Culture methods and growth measurements.Cambridge:Cambridge University Press,1973:289-312.[14]欧美珊.东海原甲藻的氮营养生理[D].广州:暨南大学,2006.
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Capacity of Heterosigma akashiwo to utilize organic nitrogen

  • 1. 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 (max) 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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