PGPR mediated Zinc biofertilization of soil and its impact on growth and productivity of wheat

Abstract

Objectives: This study describes Zinc biofortification of wheat using a rhizospheric isolate, Pseudomonas fluorescens strain Psd.Methods: The strain was used as a bio-ionculant in soil deficient in zinc and the plant-growth promoting potential and biofortification was assessed using a number of physical and biochemical parameters. The enzymatic studies indicated towards the zinc supply mediated by the strain Result: This plant-growth-promoting strain, apart from the Zn accumulation potential, has the ability to solubilise Zn and was also able to leach out Zn from ore-tailings. The application of a Zn-laden biomass of the strain in soil resulted in increased growth and productivity of wheat crop as demonstrated by pot experiments. The beneficial effect was also reflected in increased activities of some enzymes. In addition, grain Zn 2+ content was enhanced by ~85% in comparison to wheat grown in Zn 2+ -deficient soil.

Reexamining intra and extracellular metabolites produced by Pseudomonas aeruginosa

“…Morley et al [26] and Sirohi et al [4] have reported that production of H+ and organic acids seem to be the most significant mechanisms for heterotrophic metal solubilization although some contribution may also arise from excretion of other metabolites, siderophores and CO 2 from respiration, the significance of all these processes being variable and dependent on the organisms and the growth conditions. Karamushka et al [27] suggested that the proton translocating ATPase of the plasma membrane generates the electrochemical gradients that are required for the acquisition of nutrients by active efflux of protons into the external medium.…”

“…Sometimes essential nutrients (or metal compounds) such as P and S are present in a microbial habitat only in insoluble form, so microorganisms have to solubilize such compounds before uptake in order to survive [4]. In addition to that, solubilization of insoluble salts by bacteria has many technological applications e.g.…”

“…In addition to that, solubilization of insoluble salts by bacteria has many technological applications e.g. recovery of metals from low-grade ores (bioleaching or biomining), as biofertilizers (phosphorus biofertilizers) [4]and bioremediation [5]. Insoluble metal forms may be solubilized by protons, chelate ligands, and by oxidation reduction systems at cell surfaces and membranes.…”

Assessment of a new bio-organic remediation as a bio-fungicide in fusarium-infested soils of watermelon monoculture areas from China

“…Another applied solution is the use of composted organic wastes as soil amendments (Calleja-Cervantes et al, 2015). Organic fertilizers not only supply organic matter to the soil, they also help: (1) form soil aggregates (Yazdanpanah et al, 2016); (2) improve soil porosity, bulk density and water holding capacity (Burrell et al, 2016); (3) conserve and increase the microbial diversity (Dignam et al, 2016); (4) remediate heavy metal and polycyclic aromatic compounds in contaminated soils (Chen et al, 2015); and, (5) promote crop growth (Sirohi et al, 2015;Debiase et al, 2016). Microbes introduced with organic fertilizers may inhibit plant pathogens (Wu et al, 2015;Ling et al, 2016).…”

Impact of Pseudomonas aeruginosa MAJ PIA03 affecting the growth and phytonutrient production of castor, a primary host-plant of Samia ricini

“…The ACC deaminase enzyme modulates the level of ethylene by hydrolyzing ACC in ammonia and α-ketobutyrate (Marques et al, 2010). Pseudomonas fluorescens strain Psd solubilizes inorganic zinc and produces nitrate reductase along with certain antioxidant enzymes such as glutathione reductase and peroxidase which eventually supports the growth of wheat (Sirohi et al, 2015).…”