Rhizosphere

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rhizosphere

[′rī·zə‚sfir]
(geology)
The soil region subject to the influence of plant roots and characterized by a zone of increased microbiological activity.

Rhizosphere

 

the layer of soil (2-3 mm) that surrounds the root of a plant and is inhabited by a large number of microorganisms.

The composition of the microflora of the rhizosphere depends on the soil type, ecological conditions, and the age of the plant. The surface of the root is inhabited by microorganisms predominantly of the epiphytic microflora of the seed. The microorganisms, which together are called the rhizoplane, play various roles: they convert certain compounds that are difficult for the plant to assimilate into readily assimilable ones, they synthesize biologically active substances, they enter into symbiosis with the plant, they excrete toxins, and they participate in the process of denitrification. Some representatives of the microflora parasitize plants.

References in periodicals archive ?
Enhancing crop growth, nutrients availability, economics and beneficial rhizosphere microflora through organic and biofertilizers.
A General Discriminant Analysis (GDA) was used to determine whether the rhizospheres of the four different species constituted distinct chemical environments in terms of Cd, Co, Cr, Cu, Fe, Mn, Ni, Zn, Ca, Mg, P, K and N concentrations.
Rotylenchulus reniformis was found in the rhizospheres of four out of the five fruit trees analyzed (Table 1).
Because the bacterium was originally isolated from a plant rhizosphere and the patient was hospitalized with an open wound in the foot and bacteremia, we speculate that the infection was the direct result of close extended contact between the wound and soil infected with the bacteria.
Table 2: Richness and diversity estimates of the bacterial 16S rRNA amplicon libraries constructed from the rhizosphere soil from a red pepper field
We tested 18 flowering plants and 1 Bryophyte inhabiting peatlands in this region of the United States for potential rhizosphere nitrogen fixation using the acetylene reduction technique.
In the field, rhizospheres are much more complex than in the laboratory (McCully 1999).
Enumeration and Characterization of Freshwater Wetland Microflora -- Rhizosphere sediments (10.
In the hostile anaerobic bulk soil the rhizospheres of wetland plants create oxidized oases for various benign and pest microorganisms (e.
The redox potentials below - 150 mV of the flooded seedlings indicate rhizosphere anoxia whereas the redox potentials above + 250 of the unflooded rhizospheres indicate oxygenated soils (Mitsch and Gosselink, 1993).
Samples of rhizosphere soil and roots were collected from commercial rice fields of cultivars Jaya, BR 2566 and HR-12 at ZARS, Mandya, Karnataka during 2014 rice growing season.