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
Biofertilizer as a Supplement of Chemical Fertilizer for Yield Maximization of Rice
TL;DR: In this paper, a study was conducted to determine the effect of bio-organic fertilizer with reduced chemical fertilizer for rice yield maximization, and the results showed that N and P (50%) with bio-fertilizer (10 t ha -1 ) increased the number of tillers (29), panicle length (28 cm), weight of 1000 grain (21.31 g), and produced the highest grain yield (7.26 t ha-1 ).
Solubilization of calcium and iron phosphate and in vitro production of Indoleacetic acid by Endophytic isolates of Hyptis marrubioides Epling (Lamiaceae )
Luciana Cristina Vitorino,Fabiano Guimarães Silva,Marcos Antônio Soares,Edson Luiz Souchie,Alan Carlos Costa,William Cardoso Lima +5 more
TL;DR: The capacity of endophytic isolates from the root of Hyptis marrubioides Epling to solubilize calcium phosphate in GELP medium and iron phosphate in modified Reyes basal medium was characterized and strainsRF18, RG9, RF13 and RG24 were notable for their significant production of this phytohormone under test conditions.
Journal ArticleDOI
Response of some varieties of canola plant (Brassica napus L.) cultivated in a newly reclaimed desert to plant growth promoting rhizobacteria and mineral nitrogen fertilizer
M.A. El-Howeity,M.M. Asfour +1 more
TL;DR: Addition of any of the PGPR significantly improved microbial activities in the rhizosphere soil of canola plants, represented by dehydrogenase activity and CO 2 evolution.
Journal ArticleDOI
Cultivable bacteria isolated from apple trees cultivated under different crop systems: Diversity and antagonistic activity against Colletotrichum gloeosporioides.
João Frederico Mangrich dos Passos,Pedro Beschoren da Costa,Murilo Dalla Costa,Gilmar Roberto Zaffari,Gilberto Nava,José Itamar da Silva Boneti,Andreia Mara Rotta de Oliveira,Luciane Maria Pereira Passaglia +7 more
TL;DR: How anthropogenic activity is affecting the bacterial communities in soil associated with apple tree crop systems is inferred, and an isolate that was able to delay the emergence of an important disease for this culture is obtained.
REVIEW: PART OF A SPECIAL ISSUE ON MATCHING ROOTS TO THEIR ENVIRONMENT Enhancing phosphorus and zinc acquisition efficiency in rice: a critical review of root traits and their potential utility in rice breeding
Terry J. Rose,Juan Pariasca-Tanaka,Asako Mori,S. Heuer,S. E. Johnson-Beebout,M. Wissuwa,Metro Manila,Ohwashi Tsukuba +7 more
TL;DR: A review of root traits that have been linked to P and Zn uptake in rice, including traits that increase mobilization of P/Zn from soils, increase the volume of soil explored by roots or root surface area to recapture solubilized nutrients, and whole-plant traits that affect root growth and nutrient capture, is presented in this article.
References
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Journal ArticleDOI
Phosphate solubilizing bacteria and their role in plant growth promotion
Hilda Rodríguez,Reynaldo Fraga +1 more
TL;DR: Genetic manipulation of phosphate-solubilizing bacteria to improve their ability to improve plant growth may include cloning genes involved in both mineral and organic phosphate solubilization, followed by their expression in selected rhizobacterial strains.
Journal ArticleDOI
The enhancement of plant growth by free-living bacteria
TL;DR: The ways in which plant growth promoting rhizobacteria facilitate the growth of plants are considered and discussed and the possibility of improving plant growth promotion by specific genetic manipulation is critically examined.
Journal ArticleDOI
Microbial interactions and biocontrol in the rhizosphere
TL;DR: Multiple microbial interactions involving bacteria and fungi in the rhizosphere are shown to provide enhanced biocontrol in many cases in comparison with biocOntrol agents used singly.
Journal ArticleDOI
Soil Fertility and Fertilizers
TL;DR: Soil fertility and fertilizers, Soil fertility, fertilizers and soil fertility and fertility, this paper, soil fertility, soil fertility, fertility, and fertilization, etc.
Journal ArticleDOI
A Model For the Lowering of Plant Ethylene Concentrations by Plant Growth-promoting Bacteria
TL;DR: It is argued that the simplest explanation for the observed biological activity of plant growth promoting rhizobacteria relates to the relative amounts of 1-aminocyclopropane-1-carboxylate deaminase and 1-amino-2-car boxylate oxidase in the system under consideration.
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