Role of plant growth-promoting rhizobacteria and their exopolysaccharide in drought tolerance of maize

By Hafsa Naseem, A. Bano. 2014

358 citations recorded by the source corpus.

The present study deals with the isolation and characterization of exopolysaccharides (EPS) produced by the plant growth-promoting rhizobacteria (PGPR) from arid and semiarid regions of Pakistan, and to investigate the drought tolerance potential of these PGPR on maize when used as bioinoculant alone and in combination with their respective EPS. Three bacterial strains Proteus penneri (Pp1), Pseudomonas aeruginosa (Pa2), and Alcaligenes faecalis (AF3) were selected as EPS-producing bacteria on the basis of mucoid colony formation. All these strains were gram negative, motile, and positive for catalase. Strain Pp1 was positive for oxidase test and was phosphate solubilizing, while Pa2 and AF3 were negative. The isolated strains were sequenced using 16SrRNA. Total soluble sugar, protein, uronic acid, emulsification activity, and Fourier-transformed infrared spectroscopy of EPS were determined. Drought stress had significant adverse effects on growth of maize seedlings. Seed bacterization of maize with EPS-producing bacterial strains in combination with their respective EPS improved soil moisture contents, plant biomass, root and shoot length, and leaf area. Under drought stress, the inoculated plants showed increase in relative water content, protein, and sugar though the proline content and the activities of antioxidant enzymes were decreased. The Pa2 strain isolated from semiarid region was most potent PGPR under drought stress. Consortia of inocula and their respective EPS showed greater potential to drought tolerance compared to PGPR inocula used alone.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/298355b58af9fe332546d8b2fb035025f6d09753

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Citations in the corpus

Rhizosphere Engineering With Plant Growth-Promoting Microorganisms for Agriculture and Ecological Sustainability (2021, background): “…et al., 2020 strains such as P. aeruginosa, Proteus penneri, and Alcaligenes faecalis produce sugar, proline, and protein content in maize plants, which helps to improve water potential, growth, and reduces water loss for inducing tolerance against drought conditions (Naseem and Bano, 2014).”
Enhancement of drought stress tolerance in crops by plant growth promoting rhizobacteria. (2016, background): “Decreased activity of APX, CAT and GPX enzymes was reported in maize plants inoculated with EPS-producing bacteria conferring stress tolerance to plants (Naseem and Bano 2014).”
Plant Growth‐Promoting Rhizobacteria (PGPR) Reduce Evaporation and Increase Soil Water Retention (2017, background): “Subsequently, PGPR was also found to increase resistance to water stress in tomatoes and peppers (Mayak et al., 2004), in common bean (Phaseolus vulgaris L.) (Figueiredo et al., 2008), in Arabidopsis (Bresson et al., 2013), in wheat (Timmusk et al., 2014, 2015), and in maize (Naseem & Bano, 2014).”
Plant Growth Promoting Rhizobacterial Mitigation of Drought Stress in Crop Plants: Implications for Sustainable Agriculture (2019, background): “Both strains, together with their EPS, also increased soil moisture by 68% and 67%, respectively [78].”
Plant growth promoting rhizobacteria are more effective under drought: a meta-analysis (2017, background): “Additionally, PGPR can physically make soils more drought adapted through the production of an extracellular matrix containing oligo- and polysaccharides that increase water retention capacity (Naseem and Bano 2014; Timmusk et al. 2014).”
Plant-growth-promoting rhizobacteria: drought stress alleviators to ameliorate crop production in drylands (2015, background): “Decreased activity of APX, CAT and GPX enzymes has also been reported in maize plants inoculated with EPS-producing bacteria, subsequently conferring stress tolerance to plants (Naseem and Bano 2014).”
Bacterial-mediated drought tolerance: Current and future prospects (2016, background): “Naseem and Bano (2014) Zea mays Maize Burkholderia phytofirmans strain PsJN Enterobacter sp. strain FD17 Experimental system: - Greenhouse studies -”
Characterization of actinomycetes isolates for plant growth promoting traits and their effects on drought tolerance in maize (2020, neutral): “In a similar study, exopolysaccharide producing bacterial strains Proteus penneri (Pp1), Pseudomonas aeruginosa (Pa2) and Alcaligenes faecalis (AF3) exhibited better tolerance to drought stress in maize compared to individual PGPB strains (Naseem and Bano 2014).”