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
Identification of lumichrome as a sinorhizobium enhancer of alfalfa root respiration and shoot growth
Donald A. Phillips,Cecillia M. Joseph,Guo-Ping Yang,Esperanza Martínez-Romero,James R. Sanborn,Hanne Volpin,Hanne Volpin +6 more
TL;DR: Sinorhizobium meliloti-alfalfa associations, which ultimately form symbiotic N2-reducing root nodules, may be favored at an early developmental stage by lumichrome, a previously unrecognized mutualistic signal.
Book ChapterDOI
Siderophores of Pseudomonas putida as an iron source for dicot and monocot plants
TL;DR: Iron uptake from ferrated (59Fe) pseudobactin (PSB), a Pseudomonas putida siderophore, by various plant species was studied in nutrient solution culture under short term and long term conditions.
Book ChapterDOI
Association of nitrogen-fixing, plant-growth-promoting rhizobacteria (PGPR) with kallar grass and rice
Kauser A. Malik,Rakhshanda Bilal,Samina Mehnaz,Ghulam Rasul,Muhammad Sajjad Mirza,Sikander Ali +5 more
TL;DR: An agronomically significant amount of nitrogen is being fixed in soil of leptochloa fusca (L.) Kunth (kallar grass) using 15N isotopic dilution method to determine the level of biological nitrogen fixation.
Journal ArticleDOI
Niches for bacterial endophytes in crop plants: a plant biologist's view
TL;DR: It is suggested that many bacterial endophytes' may not have colonized living tissues, but are living in protective niches in dead surface tissues or closely adhering soil of rhizosheaths.
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