Multiple Roles of Bamboo As A Regulator of Cyanobacterial Bloom In Aquatic Systems

To understand the potential roles of terrestrial bamboo on controlling cyanobacterial blooms in aquatic systems, growth rates of the cyanobacterium Microcystis aeruginosa and its competitor algae were examined under different concentrations of bamboo extract. In mono-species cultures with unicellular algal strains, 5.0 g L−1 extract treatment suppressed M. aeruginosa growth, while it had little effect on the growth of green alga Scenedesmus obliquus or promoted the growth of diatom Nitzschia palea. In co-species cultures, the extract treatment increased the effect of S. obliquus and N. palea on the growth of M. aeruginosa. Under the extract treatment with a field-collected M. aeruginosa population, its cell density declined and its colony was etiolated and sank, while co-cultured N. palea increased explosively by invading the colony. These results suggest that bamboo forest stands along banks and artificially installed bamboo poles can affect the aquatic environment for phytoplankton community. Enhancing the growth of competitors, especially diatoms that can invade cyanobacterial colonies, by using extracts or by providing substrates for growth, was suggested to be the major way of the bloom control by bamboo.

INTERAKSI MIKROALGA-BAKTERI DAN PERANANNYA DALAM PRODUKSI SENYAWA DALAM KULTUR MIKROALGA

MICROALGAE-BACTERIA INTERACTIONS AND THEIR ROLES ON METABOLITES PRODUCTION OF MICROALGAE CULTURE. During this time, bacteria existence in microalgae culture is considered as a negative thing. Recently, the interaction between bacteria and microalgae can also be a mutually beneficial relationship or not detrimental to the other party. The mutually beneficial relationship between bacteria and microalgae can be applied as basic knowledge to increase microalgae culture production, which can be used further as a control mechanism for bacterial-microalgae interactions and can help increase the biomass production and certain metabolites microalgae culture. Another application is such as in environmental technology for bioremediation and bloom control.