Legumes, such as alfalfa, clover, peas, and soybeans, have a special affinity with bacteria, in that they allow them to “infect ” their root systems. But instead of harming the plants, the bacteria stimulate the roots to grow tiny nodules.
Kaunviljade, nagu lutsern, ristik, hernes ja sojauba, ning bakterite vahel valitseb eriline vastastikune tõmme, sest need viljad võimaldavad bakteritel juurestikku tungida ja seal elutseda.