Plant growth promotion mediated by bacterial rhizosphere colonizers

Zablotowicz, Robert M.; Tipping, Elizabeth M.; Lifshitz, Ran; Kloepper, Joseph W.

doi:10.1007/978-94-011-3336-4_70

Cited by 92 publications

(21 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Drimalkova M. et al (2003) [8] have isolated different fungal species from infected parts of quinoa seedlings responsible for damping-off the quinoa seedlings growth. Now, it is well established that free-living and root-colonizing microorganisms, when applied to seeds or roots, improve plant growth, reduce damage caused by phytopathogens, and alleviate abiotic stresses [9]. These microorganisms play a key role in a large number of processes in distinct ecosystems, including the acquisition of plant nutrients [10].…”

Section: Introductionmentioning

confidence: 99%

Rhizospheric Phosphate Solubilizing Bacillus atrophaeus GQJK17 S8 Increases Quinoa Seedling, Withstands Heavy Metals, and Mitigates Salt Stress

et al. 2021

View full text Add to dashboard Cite

Introduction of quinoa (Chenopodium quinoa willd.), a gluten-free nutritious pseudo-cereal, outside its traditional growing areas exposed it to seedling damping-off. Here, we isolated eleven phosphate-solubilizing bacteria from the quinoa rhizosphere and assessed their effect on germination and seedlings growth. All isolates solubilized phosphate, produced indole3-acetic acid, hydrocyanic acid, siderophores, and ammonia. Genotypic analysis revealed that our strains are related to the genus of Bacillus, Pseudomonas, and Enterobacter. Strains Enterobacter asburiae (QD14, QE4, QE6, and QE16), Enterobacter sp. QE3, and Enterobacter hormaechei QE7 withstood 1.5 mg·L−1 of cadmium sulfate, 0.5 mg·mL−1 of nickel nitrate, and 1 mg·mL−1 of copper sulfate. Moreover, all strains solubilized zinc from ZnO; P. Stutzeri QD1 and E. asburiae QD14 did not solubilize Zn3(PO4)2 and CO3Zn, whereas CO3Zn was not solubilized by E. asburiae QE16. Bacillus atrophaeus S8 tolerated 11% NaCl. P. frederiksbergensis S6 and Pseudomonas sp. S7 induced biofilm formation. Anti-fusarium activity was demonstrated for E.asburiae QE16, P. stutzeri QD1, P. frederiksbergensis S6, Pseudomonas sp. S7, and B. atrophaeus S8. Lastly, inoculation of quinoa seeds with B. atrophaeus S8 and E. asburiae QB1 induced the best germination rate and seedling growth, suggesting their potential use as inoculants for salty and heavy metal or zinc contaminated soils.

show abstract

Section: Introductionmentioning

confidence: 99%

Rhizospheric Phosphate Solubilizing Bacillus atrophaeus GQJK17 S8 Increases Quinoa Seedling, Withstands Heavy Metals, and Mitigates Salt Stress

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Microorganisms that promote plant growth may be worth evaluating as a prospective tool to improve fertilizer use efficiency [11] [12] [13] [14] [15]. Plant growth-promoting rhizobacteria (PGPR) are free-living microbes that live on or around the roots [16] and that stimulate plant growth and enhance root development and architecture [17] [18] [19] [20]. Kumar et al [21] reported that applying Pseudomonas aeruginosa LES4 at half the recommended fertilizer rate resulted in growth of sesame (Sesamum indicum L.) that was equivalent to treatments at the full fertilizer rate, and that the oil yield increased 33.3%, and protein yield increased 47.5% compared to the full fertilizer rate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Plant Growth-Promoting Rhizobacteria at Various Nitrogen Rates on Corn Growth

Lin¹,

Watts²,

Kloepper³

et al. 2019

Self Cite

View full text Add to dashboard Cite

Plant growth-promoting rhizobacteria (PGPR) colonize plant roots and promote plant growth by producing and secreting various chemical regulators in the rhizosphere. With the recent interest in sustainable agriculture, an increasing number of researchers are investigating ways to improve the efficiency of PGPR use to reduce chemical fertilizer inputs needed for crop production. Accordingly, greenhouse studies were conducted to evaluate the impact of PGPR inoculants on biomass production and nitrogen (N) content of corn (Zea mays L.) under different N levels. Treatments included three PGPR inoculants (two mixtures of PGPR strains and one control without PGPR) and five N application levels (0%, 25%, 50%, 75%, and 100% of the recommended N rate of 135 kg N ha −1). Results showed that inoculation of PGPR significantly increased plant height, stem diameter, leaf area, and root morphology of corn compared to no PGPR application under the same N levels at the V6 growth stage, but few differences were observed at the V4 stage. PGPR with 50% of the full N rate produced corn biomass and N concentrations equivalent to or greater than that of the full N rate without inoculants at the VT stage. In conclusion, mixtures of PGPR can potentially reduce inorganic N fertilization without affecting corn plant growth parameters. Future research is needed under field conditions to determine if these PGPR inoculants can be integrated as a bio-fertilizer in crop production nutrient management strategies.

show abstract

“…Examples of direct growth promotion mechanisms include nitrogen fixation [ 16 ]; phosphate solubilization or iron mobilization by microbial siderophores [ 17 ]; and provision of hormones such as indole acetic acid, cytokinin, and gibberellin [ 18 – 21 ]. Indirect plant growth-promotion occurs when PGPR increase plant growth by suppressing the growth or activity of plant pathogens and deleterious rhizosphere inhabiting microorganisms [ 22 – 26 ]. This can occur through the production of antibiotics and lytic enzymes, competition for nutrients, or induced systemic resistance against pathogens [ 4 , 15 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation ofBacillusStrains for Plant Growth Promotion and Predictability of Efficacy byIn VitroPhysiological Traits

Akinrinlola

Yuen

Drijber

et al. 2018

International Journal of Microbiology

132

View full text Add to dashboard Cite

Bacilli are commonly used as plant growth-promoting agents but can be limited in effectiveness to certain crop and soil environments. The objectives of this study were to (1) identify Bacillus strains that can be consistent in promoting the growth of corn, wheat, and soybean and (2) determine whether physiological traits expressed in vitro can be predictive of growth promotion efficacy/consistency and be used for selecting effective strains. Twelve Bacillus strains isolated from wheat rhizospheres were evaluated in greenhouse pot tests with nonsterile soil for their effects on the growth of corn, soybean, and wheat. The strains also were assessed in vitro for multiple physiological traits. All 12 strains increased corn growth significantly compared to the controls. The four most efficacious strains on corn—Bacillus megaterium R181, B. safensis R173, B. simplex R180, and Paenibacillus graminis R200—also increased the growth of soybean and wheat. No set of traits was a predictor of growth promotion efficacy. The number of traits expressed by a strain also was not an indicator of efficacy as strain R200 that was positive for only one trait showed high growth promotion efficacy. Effective strains can be identified through pot tests on multiple crop plants, but in vitro physiological assays are unreliable for strain selection.

show abstract

Plant growth promotion mediated by bacterial rhizosphere colonizers

Cited by 92 publications

References 32 publications

Rhizospheric Phosphate Solubilizing Bacillus atrophaeus GQJK17 S8 Increases Quinoa Seedling, Withstands Heavy Metals, and Mitigates Salt Stress

Rhizospheric Phosphate Solubilizing Bacillus atrophaeus GQJK17 S8 Increases Quinoa Seedling, Withstands Heavy Metals, and Mitigates Salt Stress

Effect of Plant Growth-Promoting Rhizobacteria at Various Nitrogen Rates on Corn Growth

Evaluation ofBacillusStrains for Plant Growth Promotion and Predictability of Efficacy byIn VitroPhysiological Traits

Contact Info

Product

Resources

About