Comparison of plant growth-promoting rhizobacteria in a pine forest soil and an agricultural soil

Soil Research ◽  
2018 ◽  
Vol 56 (4) ◽  
pp. 346 ◽  
Author(s):  
Víctor M. Flores-Núñez ◽  
Enriqueta Amora-Lazcano ◽  
Angélica Rodríguez-Dorantes ◽  
Juan A. Cruz-Maya ◽  
Janet Jan-Roblero
Keyword(s):  
Plant Growth ◽  
Physicochemical Properties ◽  
Forest Soil ◽  
Agricultural Soil ◽  
Bacterial Species ◽  
Plant Growth Promoting Rhizobacteria ◽  
Pine Forest ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Pine Forest Soil

The load and diversity of plant growth-promoting rhizobacteria (PGPR) are used as biomarkers to evaluate the health and quality of the soil. In the present study, the diversity of PGPRs and the physicochemical properties of the soil were used as comparative biomarkers in two adjacent soils (a pine forest soil and an agricultural soil) of the same region in Mexico City in order to investigate the effects of land use change. Bacterial diversity and physicochemical properties differed between the two soils. In the pine forest soil, PGPR were distributed at similar proportions in the Proteobacteria (29.41%), Actinobacteria (29.41%) and Firmicutes (35.29%) phyla, whereas the remaining PGPR were in Bacteroidetes (5.88%). In the agricultural soil, most PGPR belonged to the Phylum Firmicutes (50%), with the remaining belonging to Proteobacteria (22.73%), Actinobacteria (18.18%) and Bacteroidetes (9.09%). Percentages of bacteria producing indole acetic acid (90.91%) and siderophores (40.91%) were higher in agricultural soil. A canonical correspondence analysis (CCA) was used to correlate PGPR with the physicochemical characteristics of the soils. The CCA revealed that differences between both soils and the physicochemical properties of the soils affected isolated bacterial species and their distribution. These results demonstrate that the PGPR are correlated with the physicochemical properties of the soil, exhibiting differences between an agricultural soil and a pine forest soil.

scholarly journals Induced systemic resistance impacts the phyllosphere microbiome through plant-microbe-microbe interactions

2021 ◽  
Author(s):  
Anna Sommer ◽  
Marion Wenig ◽  
Claudia Knappe ◽  
Susanne Kublik ◽  
Baerbel Foesel ◽  
...  
Keyword(s):  
Plant Growth ◽  
Induced Systemic Resistance ◽  
Bacterial Species ◽  
Plant Growth Promoting Rhizobacteria ◽  
Systemic Resistance ◽  
Bacillus Thuringiensis Israelensis ◽  
Plant Growth Promoting ◽  
Microbe Interactions ◽  
Growth Promoting ◽  
Dramatic Shift

Both above- and below-ground parts of plants are constantly confronted with microbes, which are main drivers for the development of plant-microbe interactions. Plant growth-promoting rhizobacteria enhance the immunity of above-ground tissues, which is known as induced systemic resistance (ISR). We show here that ISR also influences the leaf microbiome. We compared ISR triggered by the model strain Pseudomonas simiae WCS417r (WCS417) to that triggered by Bacillus thuringiensis israelensis (Bti) in Arabidopsis thaliana. In contrast to earlier findings, immunity elicited by both strains depended on salicylic acid. Both strains further relied on MYC2 for signal transduction in the plant, while WCS417-elicited ISR additionally depended on SAR-associated metabolites, including pipecolic acid. A metabarcoding approach applied to the leaf microbiome revealed a significant ISR-associated enrichment of amplicon sequence variants with predicted plant growth-promoting properties. WCS417 caused a particularly dramatic shift in the leaf microbiota with more than 50% of amplicon reads representing two bacterial species: WCS417 and Flavobacterium sp.. Co-inoculation experiments using WCS417 and At-LSPHERE Flavobacterium sp. Leaf82, suggest that the proliferation of these bacteria is influenced by both microbial and plant-derived factors. Together, our data connect systemic immunity with leaf microbiome dynamics and highlight the importance of plant-microbe-microbe interactions for plant health.

scholarly journals Effects of Plant Growth Promoting Rhizobacteria Microbial Inoculants on the Growth, Rhizosphere Soil Properties, and Bacterial Community of Pinus sylvestris var. mongolica Annual Seedlings

2020 ◽  
Author(s):  
Qian Song ◽  
Xiaoshuang Song ◽  
Xun Deng ◽  
Jiayu Luo ◽  
Junkai Wang ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Plant Growth ◽  
Physicochemical Properties ◽  
Plant Biomass ◽  
Soil Nutrient ◽  
Plant Growth Promoting Rhizobacteria ◽  
Inorganic Phosphorus ◽  
Nutrient Index ◽  
Plant Growth Promoting ◽  
Growth Promoting

Abstract [Objective] Determine the ability of three plant growth promoting rhizobacteria (PGPR) strains (Pseudomonas Mandelli A36, Serratia plymuthica A13 and Pseudomonas koreensis A20) to promote plant growth, evaluate the effect of inoculation with PGPR strains on seedling biomass, root structure, nutrient index, and enzyme activity, and assess the effect of PGPR inoculation on soil nutrient index, enzyme activity, and the soil microecological environment.[Method] The ability of the three PGPR strains to secrete indole-3-acetic acid (IAA), dissolve inorganic phosphorus, and produce siderophore and hydrolase was determined by the medium color change method, pot experiment to determine the effects of three PGPR strains on plant biomass, physicochemical properties, soil physicochemical properties and microbial diversity. [Result] The three PGPR strains had the ability to secrete IAA, solubilize inorganic phosphorus, and produce siderophore, the results of the pot experiment showed that inoculation with PGPR strain had a significant effect on plant biomass, root index, nutrient index and enzyme activity, as well as soil nutrient index, enzyme activity and bacterial diversity. [Conclusion] This study provides basic data references for PGPR strains to improve the soil microecological environment and promote the growth and development of Pinus sylvestris var. Mongolica seedlings.

scholarly journals Genome Sequences of Two Azospirillum sp. Strains, TSA2S and TSH100, Plant Growth-Promoting Rhizobacteria with N2O Mitigation Abilities

2019 ◽  
Vol 8 (32) ◽  
Author(s):  
Nan Gao ◽  
Weishou Shen ◽  
Tomoyasu Nishizawa ◽  
Kazuo Isobe ◽  
Yong Guo ◽  
...  
Keyword(s):  
Plant Growth ◽  
Paddy Soil ◽  
Agricultural Soil ◽  
Plant Growth Promoting Rhizobacteria ◽  
Genome Sequences ◽  
Content Type ◽  
Plant Growth Promoting ◽  
Growth Promoting

Azospirillum sp. strains TSA2S and TSH100 are plant growth-promoting rhizobacteria with the capacity to mitigate N2O from agricultural soil. They were isolated from the rhizosphere of paddy soil in Tokyo, Japan. Here, we present the genome sequences of these two strains.

Bioprospection of native psychrotolerant plant-growth-promoting rhizobacteria from Peruvian Andean Plateau soils associated with Chenopodium quinoa

2020 ◽  
Vol 66 (11) ◽  
pp. 641-652
Author(s):  
Carolina Chumpitaz-Segovia ◽  
Débora Alvarado ◽  
Katty Ogata-Gutiérrez ◽  
Doris Zúñiga-Dávila
Keyword(s):  
Plant Growth ◽  
Low Temperatures ◽  
Crop Production ◽  
Bacterial Species ◽  
Chenopodium Quinoa ◽  
Plant Growth Promoting Rhizobacteria ◽  
Production Plant ◽  
Pseudomonas Plecoglossicida ◽  
Plant Growth Promoting ◽  
Growth Promoting

The Peruvian Andean Plateau, one of the main production areas of native varieties of Chenopodium quinoa, is exposed to abrupt decreases in environmental temperature, affecting crop production. Plant-growth-promoting rhizobacteria that tolerate low temperatures could be used as organic biofertilizers in this region. We aimed to bioprospect the native psychrotolerant bacteria of the quinoa rhizosphere in this region that show plant-growth-promoting traits. Fifty-one strains belonging to the quinoa rhizosphere were characterised; 73% of the total could grow at low temperatures (4, 6, and 15 °C), whose genetic diversity based on DNA amplification of interspersed repetitive elements (BOX) showed 12 different profiles. According to the 16S rRNA sequence, bacterial species belonging to the classes Beta- and Gammaproteobacteria were identified. Only three (6%) isolates identified as nonpathogenic bacteria exhibited plant-growth-promoting activities, like IAA production, phosphate solubilization, growth in a nitrogen-free medium, and ACC deaminase production at 6 and 15 °C. ILQ215 (Pseudomonas silesiensis) and JUQ307 (Pseudomonas plecoglossicida) strains showed significantly positive plant growth effects in aerial length (about 50%), radicular length (112% and 79%, respectively), and aerial and radicular mass (above 170% and 210%, respectively) of quinoa plants compared with the control without bacteria. These results indicate the potential of both psychrotolerant strains to be used as potential organic biofertilizers for quinoa in this region.

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