Science · 6 pages · 12 min
Why legumes host bacteria that fix nitrogen
Legumes house rhizobia in nodules that turn nitrogen gas into ammonia the plant can use.
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From the opening
Legumes host rhizobia, bacteria that live in nodules on the roots and convert nitrogen gas into ammonia the plant can use. The plant builds the nodule and feeds the bacteria carbon, and the bacteria supply fixed nitrogen the plant cannot make alone. The opening covers rhizobia inside a root nodule, why the cut nodule is pink, and carbon traded for ammonia.
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Inside
- Rhizobia inside a root nodule
- Why the cut nodule is pink
- Carbon traded for ammonia
- Residues feed the next crop
- Where the idea stops applying
- A distinction worth keeping
Sources
- The legume-rhizobia symbiosis
- Nitrogenase and leghemoglobin in root nodules