Farmers’ perceptions of climate change and its implication on livestock production in mixed-farming system areas of Bale highlands, Southeast Ethiopia; Challenges and extents of Soil and Water Conservation measures in Guba-Lafto Woreda of North Wollo, Ethiopia; Evaluation of milk production performance of lactating Fogera cows fed with urea and effective micro-organisms treated rice straw as basal diet.

E3 Journal of Agricultural Research and Development

E3 Journal of Agricultural Research and Development Vol. 5 (2) pp. 0108-0119, June 2015; © E3 Journals; ISSN 2276-9897


Plant growth promoting Rhizobacteria (PGPR): a review

Chaitanya Kumar Jha 1 * , Meenu Saraf 1
1 Department of Microbiology, Government Science College, Vankal, Mangrol, Surat-394430, Gujarat, India
2 Department of Microbiology and Biotechnology, University School of Science, Gujarat University, Ahmedabad-380 009, Gujarat, India
*Corresponding Author E-mail: jha_chaitanya@rediffmail.com
Accepted 20 March 2015

Abstract

Soil microbial communities are often difficult to characterize, mainly because of their immense phenotypic and genotypic diversity. In the last ten years, a number of PGPR that have been identified has seen a great boost, mainly because the role of the rhizosphere as an ecological unit has gained importance in the functioning of the biosphere and also because mechanisms of action of PGPR have been deeply studied. A putative PGPR qualifies as PGPR when it is able to produce a positive effect on the plant upon inoculation, hence demonstrating good competitive skills over the existing rhizosphere communities. PGPR influence direct growth promotion of plants by fixing atmospheric nitrogen, Solubilizing insoluble phosphates, secreting hormones such as IAA, GAs, and Kinetins besides ACC (1-Aminocycloprapane-1-carboxylic acid) deaminase production, which helps in regulation of ethylene. Induced systemic resistance (ISR), antibiosis, competition for nutrients, parasitism, production of metabolites (hydrogen cyanide, siderophores) suppressive to deleterious rhizobacteria are some of the mechanism that indirectly benefit plant growth.

Keywords: Plant growth-promoting rhizobacteria bacteria / IAA / ACC deaminase / Phosphate solunilization / Rhizosphere / Diversity

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