The role of the soil bacteria on the plant immunity

Abstract

Root bacteria construct the majority of microorganisms that are in a
colonized state in the roots of plants and are in a symbiotic connection with plants and
are considered as biocompatible organisms to increase the yield. Microorganisms
generally live on the surface on the plants but when they are applied to the seed and the
soil, they start colonizing the root surface and internal tissues of the plant and in turn
they stimulate the plant growth through different mechanisms. Rhizobacteria (PGPR)
that enhance the plant development are known as soil bacteria that occupy the perimeter
or surface of the root. PGPR bacteria’s type, and availability of different nutrients and
elements for these bacteria affect their nitrogen fixing capacity which eventually affects
the plant growth rates and yield. Moreover, these bacteria can also stimulate the plant
resistance by either strengthening the plant immunity or by producing secondary
metabolites that in turn fight against the pathogenic microorganisms. In the studies that
we are reviewing we will be discussing PGPR bacteria, their mechanism of action and
their potential to be utilized as fertilizers or plant growth stimulants.