We assessed the algaicidal potential of mangrove plant Bruguiera gymnorrhiza on microalgae Phaeocystis globosa and Heterosigma akashiwo as target species. The aqueous leaf extracts of B. gymnorrhiza significantly inhibited themicroalgae growth. The inhibitory effects of B. gymnorrhiza on microalgae were algae species dependent. Peak inhibitory rates (IR) in microalgae P. globosa and H. akashiwo were 97.4% and 90.1%, respectively. The sensitivity of both microalgal species to B. gymnorrhiza allelopathy were variable, P. globosa was more sensitive than H. akashiwo. Heat treatment did not change the algicidal potential of B.gymnorrhiza extracts (P> 0.05). Microscopic observation showed that the extracts severely damaged the cell membranes of microalgae and the microalgal cells were expanded and ruptured.
|Number of pages||8|
|Publication status||Published - 2012|