Toxic oligopeptides in the cyanobacterium Planktothrix agardhii-dominated blooms and their effects on duckweed (Lemnaceae) development | Knowledge and Management of Aquatic Ecosystems

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Table 3

Comparison of toxic effects of different cyanobacterial extracts obtained from the equal cyanobacterial biomasses on S. polyrhiza, showing independence of MC concentration.

Extract code	Cyanobacterial biomass (Chl-a mg L⁻¹)	MCs total concentration (mg L⁻¹)	Number of oligopeptides (MCs + others)	Growth inhibition (%)

				S. polyrhiza biomass	Number of roots
Pa-A	3.0	1.136	14 (4 + 10)	34 ± 8.1	45 ± 8.5
Pa-B	3.0	0.021	17 (3 + 14)	32 ± 7.6	48 ± 8.1

Data concerning growth inhibition are expressed as means ± SE, n = 5. Plant biomass and root number in controls were set as 100%.

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