title: [Effect of salicylic acid on polysaccharide and microcystin contents in Microcystis aeruginosa PCC7806].
abstract: OBJECTIVE
  To study the variation of polysaccharide (PS), which can be classified as capsule polysaccharide (EPS) and extracellular polysaccharide (EPS), and microcystin-RR (MC-RR) content of Microsystis aeruginosa under the stress of salicylic acid (SA).
  
  
  METHODS
  0, 0.25, 0.50, 0.75 and 1.00 mmol/L SA were added into the culture of M. aeruginosa at logarithmic phase and the contents of PS and MC-RR were quantified by phenol-sulfuric acid method and high performance liquid chromatography (HPLC) method in the 6th and 12th day. Meanwhile the effect of SA on PS and MC-RR contents were discussed at both the level of single cell and that of whole culture medium.
  
  
  RESULTS
  CPS contents were increased with the increasing concentration of SA on the 6th day and decreases on the 12th day. The content of EPS and intracellular MC-RR first increases and then decreases with the increasing SA concentration in the whole stage.
  
  
  CONCLUSIONS
  The contents of CPS and MC-RR increase for the stress of SA in early days, and then the contents of MC-RR both inside and outside the cell are decrease.
authors.forename: Hao
authors.initials: H
authors.lastname: Yan
authors.forename: Shengjuan
authors.initials: S
authors.lastname: Zhang
authors.forename: Cheng
authors.initials: C
authors.lastname: Li
authors.forename: Lu
authors.initials: L
authors.lastname: Liu
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhang
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003470:Culture Media; D008387:Marine Toxins; D052998:Microcystins; D046931:Microcystis; D011134:Polysaccharides; D020156:Salicylic Acid / Q000494:pharmacology*
chemical_list: D003470:Culture Media; D008387:Marine Toxins; D052998:Microcystins; D011134:Polysaccharides; C078588:microcystin; C063855:microcystin RR; D020156:Salicylic Acid