Definition

Noun 1. A genus of bacteria: Rhizobium is the type genus of the family Rhizobiaceae. These bacteria are notable for their symbiotic relationship with certain plants. 2. A nitrogen-fixing bacterium: Rhizobium bacteria are commonly found in the root nodules of leguminous plants (legumes), where they convert atmospheric nitrogen into a form the plant can use.

Usage Examples

• Noun:
  • The presence of Rhizobium in the soil is crucial for the health of crops like soybeans and peas.
  • Farmers often inoculate seeds with Rhizobium to improve soil fertility naturally.
  • Scientists study the symbiotic relationship between Rhizobium and legume roots.

Advanced Usage

• The term is often used in agricultural, biological, and environmental science contexts to discuss natural fertilization and sustainable farming practices.
• While is a specific genus, the term is sometimes used more loosely to refer to similar nitrogen-fixing bacteria (rhizobia) in a general sense within non-technical discussions.

Variants and Related Words

• Rhizobia (plural noun): A common term for bacteria, including those from the genus, that fix nitrogen in root nodules.
• Rhizobial (adjective): Relating to or characteristic of rhizobia bacteria. (e.g., rhizobial infection of the root).

Synonyms

• Nitrogen-fixing bacteria
• Symbiotic bacterium (in the context of legumes)

Notes on Meaning

• The core meaning of is taxonomic, referring to a specific scientific genus. Its defining characteristic is its ability to form nodules on legume roots and perform biological nitrogen fixation, which is its primary functional meaning in broader contexts.

Noun

1. the type genus of Rhizobiaceae; usually occur in the root nodules of legumes; can fix atmospheric oxygen