Others, such as nitrogen-fixing legumes, benefit from symbiotic relationships with rhizobia that create ammonia from atmospheric nitrogen.
22.
For example, nodules in " Acacia senegal " can contain seven species of rhizobia belonging to three different genera.
23.
Instead the rhizobia simply needed to evolve mechanisms to take advantage of the symbiotic signaling processes already in place from endomycorrhizal symbiosis.
24.
Some plants, called legumes, can form simultaneous symbiotic relationships with both AM fungi and the nitrogen-fixing bacteria Rhizobia.
25.
Several cultivars are available for agricultural use, and as for some other legume crops, rhizobia can be added to the seed.
26.
If rhizobia were perfect cooperators, choosy hosts would suffer adverse fitness consequences if, as with legumes, choice carries energy costs.
27.
Kalo exploited the claimed invention by selling multi-purpose packages containing a mixture of different species of Rhizobia suitable for different plants.
28.
Examples of organisms that do this are rhizobia and " Frankia " ( in symbiosis ) and " Azospirillum ".
29.
They contain symbiotic bacteria called rhizobia within the nodules, producing nitrogen compounds that help the plant to grow and compete with other plants.
30.
This mutually beneficial relationship is true of all of the rhizobia, of which the " Rhizobium " genus is a typical example.
