Rhizosphere
Videos
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. Soil pores in the rhizosphere
Some rhizosphere processes in the soil (A) Root system architecture is concerned with structural features of the root and responds to with environmental stimuli. (B) The rhizosphere produces photosynthetically fixed carbon that exudes into the soil and influences soil physicochemical gradients. (C) Free-living or parasitic nematodes interact with the rhizosphere via signaling interactions. (D) Mycorrhizal fungi create intimate relationships with the roots and engage in nutrient exchange. (E) Bacterial composition is distinct upon different parts, age, type of the roots.
Communication in the rhizosphere Actors and interactions in the rhizosphere: Inter-kingdom and intra-kingdom communication involving plants and microbes in the rhizosphere, including the consistent role of rhizobia. VOCs = volatile organic compounds; PGP = plant growth promoting; AMF = arbuscular mycorrhizal fungi
Root nodules, each containing billions of Rhizobiaceae bacteria
Growth chamber designs for studying rhizosphere interactions (A) Rhizotron/Rhizobox set up, (B) Rhizobox with side-compartment, (C) vertical root mat chambers; a modular option is show where the plant can be pre-grown in a separate compartment and transplanted afterward onto the main examination chamber, inset shows a modular set up option, (D) horizontal root mat in rhizobox, (E) Mycorrhizal compartments, (F) split-root systems shown here in a rhizobox set up; (G) Nylon bag to separate root and root-free soil; roots may be restricted in the bag or the soil may be protected from root penetration by the bag.
The common symbiosis signaling pathway is a highly conserved signaling cascade in plants that allows them to interact with symbiotic microbes. It corresponds to an ancestral pathway that plants use to
A LysM Domain
A TEM section of root nodule showing symbiosome made by Rhizobia, a kind of nitrogen fixing bacteria, in this case Bradyrhizobium japonicum in soybean root.