Abstract:

Microcystisaeruginosa, a common dominant species of blooms, was used as a test material to study the effects of differentconcentrations, three organic acids such as succinic acid, vanillic acid and cinnamic acid on the growth and photosynthetic pigments ofMicrocystisaeruginosa. The results showed that the inhibition effect of organic acids on the growth of Microcystisaeruginosaincreased with the increase of the treatment concentration, and the maximum inhibition rates of succinic acid, vanillic acid and cinnamic acid on Microcystisaeruginosareached 98. 63%, 48. 06% and 96. 70%, respectively, but in general, the order for inhibition was cinnamicacid> succinic acid> vanillic acid; under the action of succinic acid, vanillic acid and cinnamic acid, the content of chlorophyll a andmicrobial protein of Microcystisaeruginosawere all damaged, and the damage to phycocyanin and allophycocyanin was heavier than that of phycoerythrin. Organic acids acted on the reaction center of the algae photosynthesis system II to inhibit the photosynthesis of algae,thereby inhibiting the algae growth. In the practical application of organic acid algae control, attention should be paid to the type andconcentration of organic acid applied.

Key words: succinic acid, vanillic acid, cinnamic acid, inhibition;Microcystisaeruginosa, photosynthetic pigment