Occurrence and ultrastructural characterization of bacteria in association with and isolated from Azolla caroliniana.
AUTOR(ES)
Nierzwicki-Bauer, S A
RESUMO
The occurrence and ultrastructure of bacteria in leaf cavities of symbiotic Azolla caroliniana were examined by transmission electron microscopy. Bacteria were observed in all leaf cavities of Azolla cultures. Five ultrastructurally distinct types of bacteria were observed in each individual leaf cavity. Features used to characterize the bacteria included morphology, cell wall structure, and cytoplasmic organization. At least one gram-positive and as many as four gram-negative types of bacteria reside in leaf cavities of A. caroliniana. The morphological and ultrastructural characteristics of the gram-positive bacterium suggest that it is an Arthrobacter sp. The gram-negative bacteria could not be cultured; therefore, they have not been classified further. Bacterial cell shape and cell wall structure were similar in leaf cavities of different ages, but cell size and cytoplasmic composition varied. The relative contributions of each bacterial type to the total community within individual leaves was determined. Ultrastructural characteristics of bacterial isolates cultured from A. caroliniana in a free-living state were also examined.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=184024Documentos Relacionados
- Ultrastructural Changes in Bacteria Isolated from Cases of Leprosy
- Ecotoxicidade de herbicidas para a macrófita aquática (Azolla caroliniana)
- Phytoremediation of arsenic-contaminated water: the role of antioxidant metabolism of Azolla caroliniana Willd. (Salviniales)
- Performance de Azolla caroliniana Willd. e Salvinia auriculata Aubl. em efluente de piscicultura
- Association of metal tolerance with multiple antibiotic resistance of bacteria isolated from drinking water.