rhizosphere

(redirected from rhizospheres)
Also found in: Dictionary, Encyclopedia.

rhizosphere

the particular area immediately surrounding the roots of plants in which their exudations affect the surrounding microbial flora. Many exudations are nutrients which the microorganisms utilize and include carbohydrates, vitamins and amino acids. Conversely, the plant roots may take up minerals released by the microorganisms. Bacteria may be present in the rhizosphere in numbers fifty times greater than in surrounding soil. Gram-negative rods predominate whereas Gram-positive forms are less common than in the surrounding soil. Fungi are usually present in the rhizosphere in similar quantities to those in the surrounding soil, though some plants encourage particular forms.
References in periodicals archive ?
The rhizosphere, which is defined as the part of soil which is adjacent to, and affected by plant root (SArensen, 1997), has frequently been used as a model environment for the isolation of potential biological control strains (Raaijmakers et al.
The rhizospheres of several species examined at multiple sites were NA positive regardless of habitat: Carex lacustris, Chamaedaphne calyculata, Typha angustifolia, and Vaccinium macracarpon (Table 1).
It is organised into: (1) a section on the ecology of the rhizosphere, and especially of perennial rhizospheres--the niches that successive generations of roots occupy in unploughed soil, how their properties differ from those of bulk soil, and how diverse the properties of the roots are when growing in field soil; (2) three case studies of major agronomic effects that are becoming explicable in terms of interactions between roots and soil organisms; and (3) future directions including an analysis of diagnostic tools, and prospects for novel ways of harnessing biological activity in the soil to improve the performance of crops.
was selected from the rhizosphere of the freshwater wetland plant Juncus effusus L.
Some critical features distinguish the rhizospheres of wetland plants from those of terrestrial plants.
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.
Rhizosphere soil was recovered from field plots three or four times throughout each season.
Wheeler and Edmeades (1997) reported an increase in N mineralisation due to the addition of lime, and in another study using several perennial plant rhizospheres, Kennedy et al.
The bacterium is widely distributed in the environment, including in plant rhizospheres (2).
Effect of Norwegian entomopathogenic fungal isolates against Otiorhynchus sulcatus larvae at low temperatures and persistence in strawberry rhizospheres.