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Environ Toxicol

Title:		Physiological responses of Microcystis aeruginosa PCC7806 to nonanoic acid stress
Author(s):		Shao JH; Wu XQ; Li RH;
Address:		"Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, People's Republic of China"
Journal Title:		Environ Toxicol
Year:		2009
Volume:		24
Issue:		6
Page Number:		610 - 617
DOI:		10.1002/tox.20462
ISSN/ISBN:		1522-7278 (Electronic) 1520-4081 (Linking)
Abstract:		"A recent study has shown that nonanoic acid (NA) is one of the strongest allelochemicals to a cyanobacterium Microcystis aeruginosa, but the physiological responses of M. aeruginosa to NA stress remain unknown. In this study, physiological characters such as the growth rate, photosynthetic processes, phosphorus and nitrogen uptake kinetics, and the contents of intracellular microcystin of M. aeruginosa PCC7806 were studied under the NA stress. The results showed that the growth rates of M. aeruginosa PCC 7806 were significantly inhibited in all NA stress treatments during first 3 days after exposure, and the growth rate was recovered after 5-day exposure. After 2-day exposure, the contents of both phycocyanin and allophycocyanin per cell decreased at NA concentration of 4 mg L(-1), and oxygen evolution was inhibited even at the concentration of 0.5 mg L(-1), but carotenoid content per cell was slightly boosted in NA stress. Physiological recovery of M. aeruginosa PCC7806 was observed after 7-day exposure to NA. It was shown that NA stress had no effect on uptake of nitrogen, but could stimulate the uptake of phosphorus. The contents of intracellular microcystin have not been affected in all NA treatments in contrast with the control"
Keywords:		"Fatty Acids/*toxicity Marine Toxins Microcystins/metabolism Microcystis/*drug effects/growth & development/*metabolism Nitrogen/metabolism Oxygen/metabolism Pheromones/*toxicity Phosphorus/metabolism *Stress, Physiological Toxicity Tests;"
Notes:		"MedlineShao, Ji-Hai Wu, Xing-Qiang Li, Ren-Hui eng Research Support, Non-U.S. Gov't 2008/12/10 Environ Toxicol. 2009 Dec; 24(6):610-7. doi: 10.1002/tox.20462"