Rhizobium Enhances Algal Biomass through Mutualistic Interaction
September 18, 2014http://www.sciencedirect.com/science/article/pii/S0961953414003481
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Rhizobium plays a pivotal role in symbiotic interactions with plants. However, the study by researchers from Korea Research Institute of Bioscience and Biotechnology extends this mutualism to several species of green algae.
Denaturing gradient gel electrophoresis (DGGE) and gene clone library experiments of Chlamydomonas reinhardtii, Chlorella vulgaris, Scenedesmus sp., and Botryococcus braunii revealed that the dominant bacteria hosted by these green algae were Rhizobium, Mesorhizobium, Shinella, Flavobacterium, and Pseudomonas.
Rhizobium promoted algal cell count by about 72% when co-cultured with green algae. The growth rates of algae and Rhizobium increased by an average of 11% and 110%, respectively, confirming mutualistic interaction. Since Rhizobium sp. was found in several green algae, it must be a major mutualistic relationship among green algae. This interaction could be utilized in enhancing microalgal biomass to improve their bioenergy productivity.
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