Trichormus variabilis 9RC Genome sequencing and assembly. Trichormus variabilis 9RC

Anabaena variabilis 9RC is a photosynthetic, nitrogen-fixing cyanobacterium that was isolated as a possible cyanobiont from the fresh-water fern Azolla caroliniana. This free-living, filamentous strain forms heterocysts in the absence of combined nitrogen and fixes nitrogen using one of three nitrogenase systems, Nif1, Nif2, or Vnf. A. variabilis 9RC is chemoheterotrophic and can use sugars as a carbon source. A. variabilis 9RC is nearly identical to A. variabilis ATCC 29413 (NCBI:txid240292), a free-living strain that is capable of infecting the liverwort Blasia. However, unlike A. variabilis ATCC 29413 and other similar strains, A. variabilis 9RC lacks the 37.1 kb tRNA-cys incision element.