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KMID : 0368420210640060501
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Journal of Plant Biology
2021 Volume.64 No. 6 p.501 ~ p.510
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Allelopathic Inhibition Effects of Myriophyllum spicatum on Growths of Bloom-Forming Cyanobacteria and Other Phytoplankton Species in Coexistence Experiments
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Jeong Seon-Ah
Yang Dong-Woo
Joo Sung-Bae
Park Sang-Kyu
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Abstract
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Many studies have attempted to find measures for control of cyanobacterial harmful algal blooms (cyanoHABs) caused by Microcystis, Anabaena, and other bloom-forming plankton species. We have investigated allelopathic inhibition of the submerged macrophyte Myriophyllum spicatum on four phytoplankton species of two taxonomic groups: Chlorophyta Selenastrum capricornutum, Scenedesmus obliquus, and cyanobacteria Microcystis aeruginosa (different strains for toxic, non-toxic, the North Han River originated (NHR) and colonies) and Anabaena circinalis. Inhibitions of unicellular cyanobacteria M. aeruginosa were over 50% for three consecutive days from the 3rd to the 5th day of the coexistence. M. spicatum even inhibited M. aeruginosa at a high initial concentration (1.1 mg L?1 Chl-a). Moreover, M. aeruginosa in a mixture of four phytoplankton species (S. capricornutum, S. obliquus, M. aeruginosa and A. circinalis) was selectively inhibited by M. spicatum. The inhibition of toxic, non-toxic, and NHR of Microcystis by M. spicatum were not significantly different. Colonial cyanobacteria strains were mostly not inhibited by M. spicatum.
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KEYWORD
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Allelopathy, Myriophyllum spicatum, Microcystis aeruginosa, Harmful algal bloom, Cyanobacteria, Phytoplankton
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