Journal ArticleDOI
Plant growth promoting rhizobacteria as biofertilizers
TLDR
This review focuses on the known, the putative, and the speculative modes-of-action of PGPR, which include fixing N2, increasing the availability of nutrients in the rhizosphere, positively influencing root growth and morphology, and promoting other beneficial plant–microbe symbioses.Abstract:
Numerous species of soil bacteria which flourish in the rhizosphere of plants, but which may grow in, on, or around plant tissues, stimulate plant growth by a plethora of mechanisms. These bacteria are collectively known as PGPR (plant growth promoting rhizobacteria). The search for PGPR and investigation of their modes of action are increasing at a rapid pace as efforts are made to exploit them commercially as biofertilizers. After an initial clarification of the term biofertilizers and the nature of associations between PGPR and plants (i.e., endophytic versus rhizospheric), this review focuses on the known, the putative, and the speculative modes-of-action of PGPR. These modes of action include fixing N2, increasing the availability of nutrients in the rhizosphere, positively influencing root growth and morphology, and promoting other beneficial plant–microbe symbioses. The combination of these modes of actions in PGPR is also addressed, as well as the challenges facing the more widespread utilization of PGPR as biofertilizers.read more
Citations
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Journal ArticleDOI
The rhizosphere microbiome and plant health
TL;DR: In this article, the authors discuss evidence that upon pathogen or insect attack, plants are able to recruit protective microorganisms, and enhance microbial activity to suppress pathogens in the rhizosphere.
Journal ArticleDOI
Biological control of soil-borne pathogens by fluorescent pseudomonads
Dieter Haas,Geneviève Défago +1 more
TL;DR: Biocontrol strains of fluorescent pseudomonads produce antifungal antibiotics, elicit induced systemic resistance in the host plant or interfere specifically with fungal pathogenicity factors during root colonization.
Journal ArticleDOI
Plant growth-promoting rhizobacteria (PGPR): emergence in agriculture
TL;DR: The progress to date in using the rhizosphere bacteria in a variety of applications related to agricultural improvement along with their mechanism of action with special reference to plant growth-promoting traits are summarized and discussed in this review.
Journal ArticleDOI
The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms
TL;DR: The main functions of rhizosphere microorganisms and how they impact on health and disease are reviewed and several strategies to redirect or reshape the rhizospheric microbiome in favor of microorganisms that are beneficial to plant growth and health are highlighted.
Journal ArticleDOI
Mechanisms and applications of plant growth promoting rhizobacteria: Current perspective
TL;DR: The latest paradigms of applicability of these beneficial rhizobacteria in different agro-ecosystems have been presented comprehensively under both normal and stress conditions to highlight the recent trends with the aim to develop future insights.
References
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Journal ArticleDOI
The Ecology and Biogeography of Microorganisms on Plant Surfaces.
John H. Andrews,R. F. Harris +1 more
TL;DR: The vast surface of the plant axis, stretching from root tips occasionally buried deeply in anoxic sediment, to apical meristems held far aloft, provides an extraordinarily diverse habitat for microorganisms.
Journal ArticleDOI
Screening for plant growth-promoting rhizobacteria to promote early soybean growth
TL;DR: The results suggest that rhizobacteria able to produce ACC deaminase and, to a lesser extent, β-1,3-glucanase or siderophores or those able to solubilize P in vitro may increase early soybean growth in nonsterile soil.
Journal ArticleDOI
Soil microbial community structure: Effects of substrate loading rates
TL;DR: An experiment where a synthetic root exudate was applied continuously to a soil held at constant water potential indicated that microbial community structure changed consistently as substrate loading increased, and that fungi dominated over bacteria at high substrate loading rates.
Journal ArticleDOI
Potential of Rhizobium and Bradyrhizobium species as plant growth promoting rhizobacteria on non-legumes: Effect on radishes (Raphanus sativus L.)
TL;DR: The potential of nodule inducing bacteria to function as PGPR on non-legumes, was examined by using radish as a model plant and found Bradyrizobium japonicum strain Soy 213 was found to have the highest stimulatory effect and an arctic strain was the most deleterious, causing a 44% reduction in radish dry matter yield.
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