Bradyrhizobium
Bradyrhizobium
Bradyrhizobium (pronunciation: bray-dee-rye-zoh-bee-uhm) is a genus of Gram-negative bacteria that are notable for their ability to form symbiotic relationships with leguminous plants, aiding in nitrogen fixation. The term "Bradyrhizobium" is derived from the Greek words "bradys" meaning slow, and "rhiza" meaning root, referring to the slow-growing nature of these bacteria on root nodules.
Etymology
The term "Bradyrhizobium" was first coined in the late 20th century. It is derived from the Greek words "bradys" (βραδύς), meaning slow, and "rhiza" (ῥίζα), meaning root. This name was chosen to reflect the slow-growing nature of these bacteria on root nodules.
Characteristics
Bradyrhizobium species are Gram-negative bacteria, meaning they do not retain the violet crystal violet stain used in the Gram stain procedure. Instead, they take up the red counterstain. They are also rod-shaped bacteria, and are typically motile due to the presence of flagella.
Symbiosis and Nitrogen Fixation
Bradyrhizobium species are known for their ability to form symbiotic relationships with leguminous plants. In these relationships, the bacteria infect the roots of the plants, forming nodules where they convert atmospheric nitrogen into a form that the plant can use, a process known as nitrogen fixation. In return, the plant provides the bacteria with nutrients and a protected environment.
Related Terms
External links
- Medical encyclopedia article on Bradyrhizobium
- Wikipedia's article - Bradyrhizobium
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