Nostoc azollae

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Classification

Domain: Bacteria
Phylum: Cyanobacteria
Class: Cyanophyceae
Order: Nostocales
Family: Nostocaceae
Genus: Nostoc

Species

NCBI: Taxonomy

Nostoc azollae

Light micrograph of nostoc azollae strain 0708. Image from JGI Genome Portal

Description and Significance

Nostoc azollae, from the genus "Nostoc", is a cyanobacteria (1), meaning it is a phototrophic organism that creates its own energy through photosynthesis. N. azollae, like most of the Nostoc genus, inhabits freshwater, tropical, temperate, and polar terrestrial systems, but are rarely found in marine environments (2). The microbe grows as unbranched filaments and differentiates itself into three seperate types of cells. Heterocysts, which differentiate in response to nitrogen deficiencies, and act as sites of fixation for the environment. These make up anywhere from 3-10% of the microbe's cells. N. azollae is also capable of creating two other kinds of cells, hormongia, consisting of short filaments, and spore-like akinetes to make up for any limitations in the environment (2).

The significance of the microbe is found within its symbiosis with Azolla filiculoides, a type of plant native to warm tropical regions all across the globe (3). The fern possesses numerous small cavities all along its surface that house N. azollae and allow for the transfer of nutrients between the two symbionts (4).

Genome Structure

Describe the size and content of the genome. How many chromosomes? Circular or linear? Other interesting features? What is known about its sequence?

Cell Structure, Metabolism and Life Cycle

Interesting features of cell structure; how it gains energy; what important molecules it produces.

Ecology and Pathogenesis

Habitat; symbiosis; biogeochemical significance; contributions to environment.
If relevant, how does this organism cause disease? Human, animal, plant hosts? Virulence factors, as well as patient symptoms.