Abstract
Marine plants are considered as a source of bioactive compounds as they are able to produce a great variety of secondary metabolites characterized by a broad spectrum of biological activities. Compounds with antioxidant, antiviral, antifungal and antimicrobial activities have been detected in mangroves, seaweeds and seagrasses. Marine plants are the source of amino acids, terpenoids, phlorotannins, steroids, phenolic compounds, halogenated ketones and alkanes and cyclic polysulphides. In this study, the antibacterial activity of flowering seagrass species viz., Syringodium isoetifolium and Cymodocea serrulata and non-flowering seaweeds viz., Amphiroa anceps, Gracilaria corticata, Sargassum wightii, Padina pavonica, Ulva lactuca, and Valaniopsis pachynema were tested. Interestingly it is found that, most of the ethanolic algal extracts controls all the pathogens of antibiotic resistant organism, fish pathogens, poultry pathogens and human ophthalmic pathogens. The antibacterial activity of halophytic plant extracts were evaluated by the well diffusion assay and the zone of inhibition ranged between 6mm to 14mm. The maximum activity was recorded with the marine algal ethanolic extract of V. pachynema against almost to all the pathogens selected for the study.

1503022.Antimicrobial activity of marine flowering and non-flowering halophytic plants…pdf.