The effects of vegetative and generative shoots of Ajuga Chamaecistus, A. austro-iranica against some bactria and fungi strains

Subject Areas : microbiology

Farkhondeh Rezanejad ¹ , Sedigheh Mehrabian ²

1 - Professor, biology Group, Shahid Bahounar University, Kerman, Iran
2 - Professor, biology Group, Kharazmi University,Tehran, Iran.

Received: 2020-07-06 Accepted : 2020-10-07 Published : 2020-09-22

Keywords: gram positive, anti microbial effects, Fungi and bacteria, Ajuga, Vegetative and generative structures, gram negative,

Abstract :

Objectives: Study of antimicrobial effects of aqueous and methanolic extracts of vegetative and reproductive structures of A. Chamaecistus and A. austro-iranica on several fungi and bacteria Materials and Methods: Aquatic and methanolic extracts prepared from Ajuga Chamaecistus, A. austro-iranica were tested for antibacterial activity against gram positive (Satphyloccocus aureous and Streptococus pyogenes) and gram negative (Pseudomonas aeroginosa and Proteus vulgaris) bacteria and Aspergillus niger and fusarium solani. The vegetative and generative shoots of plants were powdered, sterilized, and extracted at 4°C with methanol and water. The concentrations of 50, 100 and 200 mgml-1 of methanolic and aquatic extracts were used to detect the minimum inhibitory concentration (MIC). All experiments were tested three times. The antibacterial effects were evaluated using the cup-plate and antifugal activity using cup-plate and pour plate Results: The antibacterial effect of aqueous extracts showed that only the leaf extract (vegetative extract) of A. chamaecistus is effective on S. aureus showing that in gram-negative bacteria, the presence of a lipopolysaccharide wall causes greater resistance. Methanolic extracts of both species were more active than aqueous extracts and had antimicrobial effects on all tested bacteria as well as A. niger. In both species, the extracts of the generative parts showed a stronger antifungal effect. In different species of this genus, the presence of phenolic compounds, tannins and terpenoids that have antimicrobial properties confirms the antimicrobial properties of this species. However, the amount of their effect depends on plant and microbe species, the tested parts (plant organs), the extracts concentration, the sampling season, the sample age and soil type.    

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