Growth promotion of the freshwater microalga Chlorella vulgaris by the nitrogen-fixing,plant growth-promoting bacterium Bacillus pumilus from arid zone soils |
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| Authors: | Juan-Pablo Hernandez Luz E de-Bashan D Johana Rodriguez Yaneth Rodriguez Yoav Bashan |
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| Institution: | 1. Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), La Paz, B.C.S., Mexico;2. Department of Soil, Water and Environmental Science, University of Arizona, Tucson, Arizona, USA;3. Department of Biology, Universidad del Tolima, Ibagué, Colombia;4. Faculty of Agronomy, Universidad Nacional de Colombia, Bogota, Colombia |
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| Abstract: | Immobilization of Bacillus pumilus ES4 from arid land soils, a plant growth-promoting bacterium and the freshwater, green microalga Chlorella vulgaris enhanced microalgal growth only in the absence of combined nitrogen in synthetic growth medium (SGM), but not in medium with combined nitrogen. B. pumilus was able to fix nitrogen in N-free SGM and its growth yielded an accumulation of ammonium in the medium. On its own, B. pumilus is a poor agent for removing nitrogen and phosphorus from wastewater, while C. vulgaris is a capable microorganism. By jointly immobilizing the two microorganisms, the capacity to remove nitrogen and phosphorus from the medium by the microalgae culture was not enhanced, but, at the cell level, removal of these nutrients was significantly enhanced. It appears that growth promotion induced by B. pumilus on C. vulgaris is related to nitrogen fixation. |
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