Multiple exposures to high concentrations of selenate significantly improve selenate tolerability, red elemental selenium (Se) and selenoprotein biosynthesis in Herbaspirillum camelliae WT00C.

Herbaspirillum camelliae WT00C is a gram-negative endophyte isolated from the tea plant. It has an intact selenate metabolism pathway but poor selenate tolerability. In this study, microbiological properties of the strain WT00C were examined and compared with other three strains CT00C, NCT00C and NT00C, which were obtained respectively from four, six and eight rounds of 24-h exposures to 200 mM selenate.

Red elemental selenium (Se ) improves the immunoactivities of EPC cells, crucian carp and zebrafish against spring viraemia of carp virus.

Selenium, as an essential trace element, interferes through selenoproteins in many physiological processes of plants and mammals. Its antiviral activity has recently attracted much attention because selenium improves the antiviral capacity of animal cells against a few viruses relevant to human diseases. In this study, the red elemental selenium was purified from the fermentative culture of Herbaspirillum camelliae WT00C and then used to culture epithelioma papulosum cyprinid (EPC) cells or feed crucian carp and zebrafish.

Herbaspirillum camelliae sp. nov., a novel endophytic bacterium isolated from Camellia sinensis L.

Bacterial strain WT00C is an endophytic bacterium that was isolated from the tea plant (Camellia sinensis L.). The phylogenetic analysis of 16S rRNA genes demonstrated that strain WT00C was a member of the genus Herbaspirillum.

Bacterial growth, morphology, and cell component changes in Herbaspirillum sp. WT00C exposed to high concentration of selenate.

Selenium (Se) is a nonmetallic element of the chalcogens. It is primarily available in natural environments as selenate and selenite oxoanions. Although selenate/selenite reduction in many microbes is widely studied at low concentrations (<50 mM), the effects of high selenate stress on bacterial growth, morphology, and cell components have not yet been studied.