Abstract
The present study aimed to explore the feedback mechanism of M. aeruginosa under the stress of I. pseudacorus L.. by determining the polysaccharide composition and microcystins (MCs) synthesis and release of M. aeruginosa through co-cultivation of I. pseudacorus L. and M. aeruginosa. The results of our investigation and observation have shown that, under the stress of 20 or 40 g/L of I. pseudacorus L., the contents of intracellular and extracellular MC-LR, and the intracellular polysaccharide (IPS), the bound extracellular polysaccharide (bEPS) of M. aeruginosa increased at first and then began to decrease gradually afterwards. And the maximum contents were (71.03±10.20) fg/cell, (0.66±0.07) fg/cell, (1.84±0.10) pg/cell, (1.11±0.11) pg/cell and (70.33±8.62) fg/cell, (0.64±0.10) fg/cell, (1.74± 0.17) pg/cell, (0.90± 0.12) pg/cell. I. pseudacorus L. had an adsorption-enrichment effect on MCs. The content of MC-LR in the roots were (8.37±1.58) ng/g and (4.33±1.31) ng/g when I. pseudacorus L. was 20 or 40 g/L, respectively.
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