The effect of phosphite on the growth and photosynthesis of Microcystis aeruginosa
Reduced phosphorous phosphite (+3 valence) has recently aroused great concern about its possibility as a P source due to recent recognition of its vital role in early earth and its widespread use in the environment. An investigation has been carried out into whether phosphite can be an alternative P source for Microcystis aeruginosa 7806, which is one of the advantageous species in fresh waters. Results from batch cultures indicate that phosphite is not a suitable P source for cells grown in phosphite medium but it can boost cell number and Chlorophyll a (Chl-a) content as long as phosphate is provided in the medium Especially, Chl-a production increases sharply when 0.5 mg P/L phosphate is supplied. Analysis of the maxim yield of PSII with Chl-a fluorescence indicates that this increase is closely related with the stimulating effect of phosphite on photosynthesis of cells. Besides, the determination of phosphite shows that it is more readily assimilated into cells in P-deficient medium than that in P -sufficient medium. Alkaline phosphatase activity (APA) analysis indicates that phosphite, unlike organic P, inhabits the response of cells to deficient Pi status especially under Pi-deprived condition.
J.Zhang J.J.Geng A.Q.Zhang X.R.Wang
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China
国际会议
武汉
英文
56
2011-04-05（万方平台首次上网日期，不代表论文的发表时间）