Elsevier

Applied Soil Ecology

Volume 5, Issue 1, January 1997, Pages 1-20
Applied Soil Ecology

Review
Deleterious rhizosphere bacteria: an integrating perspective

https://doi.org/10.1016/S0929-1393(96)00124-2Get rights and content

Abstract

The rhizosphere of plants is usually occupied by both deleterious rhizobacteria (DRB), which may inhibit plant growth, and plant growth moting rhizobacteria (PGPR). Root exudates play a key rolein determining host specific interactions with, and the composition of, the rhizobacterial population. A degree of coevolution between rhizobacteria and plants is implied. DRB have been implicated in yield declines associated with continuous monoculture. DRB inhibit growth primarily through production of phytotoxins but phytohormone production, competition for nutrients and inhibition of mycorrhizal function may also occur. The effect of individual isolates of rhizobacteria on plants can fluctuate from growth inhibition to growth promotion, according to environmental conditions, the host genotype and mycorrhizal status. Furthermore, rhizobacteria have the potential to act as both DRB and PGPR through simultaneous inhibition of plant growth and control of fungal plant pathogens. Therefore classification of rhizobacteria as either DRB or PGPR is somewhat equivocal and should be based upon their net effects on plant growth according to circumstance. The capacity for fluctuation in the phytogenic function of rhizobacteria presents a challenge for management of DRB and manipulation of the rhizosphere to improve the sustainability of agriculture.

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