Assessment of the Potentially Algicidal Effects of Thymus Satureioides Coss. And Artemisia Herba Alba L. Against Microcystis Aeruginosa

Abstract

Abstract. In search of an ecofriendly algaecide, aqueous extracts of two medicinal plants, Thymus satureioides Coss. and Artemisia herba alba L., were assessed for antialgal activity against Microcystis aeruginosa. An experiment was designed using five treatments (1%, 0.75%, 0.5%,0.25% and 0.1%). The growth of M. aeruginosa, morphological modifications, and photosynthetic pigments (chlorophyll a and carotenoids) on exposure to the extracts were explored. Also, phytochemical parameters in the extracts were analyzed to reveal the potential allelochemical compounds.The results showed that both T. satureioides and A. herba alba extracts inhibited the growth of M. aeruginosa in a concentration-dependent way. After 8 days of treatment, the highest inhibition rates reached were 95%, 93% and 88.58%, and for T. satureioides and A. herba alba aqueous extracts, respectively. Chlorophyll a and carotenoid concentrations in cultures decreased especially in the 1% treatment group. Several morphological changes were observed in the treatment group compared to the controls. It was concluded that M. aeruginosa growth was suppressed by the potentially allelochemical compounds and probably by other allelochemical substances in aqueous extracts. Our results illustrated that both T. satureioides and A. herba alba extracts are able to control Microcystis blooms, and these may be recommended as a remedy for contamination of water bodies by harmful blooms.

Ethnopharmacology, Phytochemistry, and Pharmacological Properties of Thymus satureioides Coss.

“…In a recent study, Tebaa et al [ 59 ] showed that the aqueous extracts of T. satureioides aerial parts are rich in total polyphenols (285 ± 34.82 μ g gallic acid equivalent/mL aqueous extract), in total flavonoids (25.83 ± 4 μ g catechin equivalent/mL aqueous extract) and in total tannins (0.032 ± 0.002 μ g tannic acid equivalents/mL aqueous extract).…”

Inhibitory effect and mechanism of three macrophytes extract on Microcystis aeruginosa growth and physiology

“…In order to obtain pure isolates, a series of successive sub‐culturing was carried out in Z8 medium in a culture chamber under controlled conditions: light intensity of 63 micromole photon. m −2 s −1 using cool white fluorescent lamps, a light/dark photoperiod of 15:9 h and temperature of 25 ± 2°C (Tebaa et al ., 2018; Tazart et al ., 2019).…”

Allelopathic Efficiency of Plant Extracts to Control Cyanobacteria in Hydroponic Culture

“…There are various allelochemicals, including terpenes, phenolics, aromatics, tannins, alkaloids, and flavonoids [19][20][21][22][23]. Since the allelochemicals are derived from plants, many attempts have been conducted to use the allelochemicals or extracts containing the chemicals as eco-friendly algaecides [3,24,25]. However, these attempts have focused on controlling algae rather than considering their impact on hydroponic crops.…”