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The rhizosphere is the narrow region of soil or substrate that is directly influenced by root secretions and associated soil microorganisms known as the root microbiome.[2] The rhizosphere involving the soil pores contains many bacteria and other microorganisms that feed on sloughed-off plant cells, termed rhizodeposition,[3] and the proteins and sugars released by roots, termed root exudates.[4] This symbiosis leads to more complex interactions, influencing plant growth and competition for resources. Much of the nutrient cycling and disease suppression by antibiotics required by plants, occurs immediately adjacent to roots due to root exudates and symbiotic and pathogenic communities of microorganisms.[5] The rhizosphere also provides space to produce allelochemicals to control neighbours and relatives.[6] The plant-soil feedback loop and other physical factors occurring at the plant-root soil interface are important selective pressures for the communities and growth in the rhizosphere.[7]