Green beans are a legume plant See the little balls fixated to the root – this is a root nodule. Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria.[1] Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia.[2] This process has evolved multiple times within the legumes, as well as in other species found within the Rosid clade.[3] Legume crops include beans, peas, and soybeans.

Leave a Reply