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Nitric oxide (NO) is a non-traditional regulator of the growth of plants and phytoplankton. Here, the growth of five marine phytoplankton species, Platymonas helgolandica var. tsingtaoensis, Platymonas subcordiformis, Skeletonema costatum, Gymnodinium sp., and Prorocentrum donghaiense, was monitored, and carbonate system parameters in the culture media were determined after adding different concentrations of NO and sodium nitroprusside (SNP, NO donor) solutions. The two dietary algae (P. helgolandica var. tsingtaoensis and P. subcordiformis) and three red tide algae (S. costatum, Gymnodinium sp., and P. donghaiense) showed different responses to the same NO concentration. The red tide algae were more sensitive to exogenous NO than the dietary algae. NO with a concentration of 1.4 x 10.sup.-6 mol L.sup.-1 had the optimal stimulatory effect on the growth of the microalgae and increased the cell density by 9.8-38.3%. SNP solution with a concentration of 100 [mu]mol L.sup.-1 inhibited the growth of the two dietary algae, and the cell density decreased by 38.8-84.3%. The addition of 10 [mu]mol L.sup.-1 SNP solution to the three red tide algae decreased the cell density by 95.3-99.9%. Low concentrations of SNP (0.1 [mu]mol L.sup.-1 for the two dietary algae and 0.01 [mu]mol L.sup.-1 for the red tide algae) slightly promoted the growth of microalgae. High concentrations of NO (100 [mu]mol L.sup.-1 SNP) inhibited CO.sub.2 assimilation, whereas low concentrations of NO (0.01-1.0 [mu]mol L.sup.-1 SNP) promoted CO.sub.2 assimilation, indicating that NO participates in the regulation of photosynthesis., Author(s): Pei-Feng Li [sup.1] , Min Zhao [sup.1] , Chun-Ying Liu [sup.1] [sup.2] , Gui-Peng Yang [sup.1] [sup.2] Author Affiliations: (1) grid.4422.0, 0000 0001 2152 3263, Frontiers Science Center for [...]