Bradyrhizobium japonicum

Bradyrhizobium japonicum

Bradyrhizobium japonicum is a species of bacteria from the family of Rhizobiales. As a nitrogen -fixing symbiont of soybean ( Glycine max) is one of the most economically important bacteria.

Features

Bradyrhizobium japonicum is a rod-shaped, gram - negative bacterium. Like other species of the genus Bradyrhizobium is growing the way only slowly in culture and produces alkaline medium without serum zone in litmus milk. The species is differentiated from other species of serum due to testing and DNA sequence. Only this type and the closely related Bradyrhizobium come ELKANI ago as symbionts of soybean. The systematic position and the separation of the two species are not fully understood. Since 2002 there is a sequence of the genome of B. japonicum. The genome size is 9.1 million base pairs, the GC content is 64.1 percent.

Symbiosis

Bradyrhizobium japonicum lives as a symbiont in root nodules of soybean. As a bacterial signal for nodulation Lipochitin formed after contact with plant flavonoids used. The bacteria are endocytosed and live as Bacteroide in a special organelle, the Symbiosom. There they fix nitrogen to ammonium for the plant and in return receive nutrients.

In root nodules, the Bacteroide are powered by leghemoglobin with oxygen for the energy-intensive nitrogen fixation. By binding the oxygen to the oxygen-sensitive enzymes leghaemoglobin the nitrogen fixation remain protected.

Swell

  • Herman P. Spaink, Adam Kondorosi, Paul JJ Hooykaas: The Rhizobiaceae: Molecular Biology of Model Plant -associated Bacteria. Springer, 1998, ISBN 9,780,792,351,801th
Alphaproteobacteria Bradyrhizobiaceae
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