Arabidopsis thaliana: a model for studies of colonization by non-pathogenic and plant-growth-promoting rhizobacteria

2001 ◽  
Vol 28 (9) ◽  
pp. 975
Author(s):  
Kenneth J. O'Callaghan ◽  
Richard A. Dixon ◽  
Edward C. Cocking
Keyword(s):  
Arabidopsis Thaliana ◽  
Plant Growth ◽  
Stress Responses ◽  
Plant Defence ◽  
Plant Growth Promoting Rhizobacteria ◽  
Molecular Data ◽  
Flavonoid Metabolism ◽  
Plant Growth Promoting ◽  
Plant Genes ◽  
Growth Promoting

This paper originates from an address at the 8th International Symposium on Nitrogen Fixation with Non-Legumes, Sydney, NSW, December 2000 Arabidopsis thaliana L. has many features favoring its use as a model in studies of plant-growth-promoting rhizobacteria (PGPR), such as diazotrophs. Several niches are colonized in the root system of Arabidopsis, including xylem, and intact colonized roots can be observed microscopically without sectioning of tissues. Studies of plant genes involved in colonization are facilitated by the ease with which plants are transformed and by the availability of mutant lines and other accessions obtainable from stock centers. Lines of Arabidopsis carrying reporter gene fusions are helping to reveal the pattern of expression of previously cloned plant genes induced by rhizobacteria. Studies utilizing indole-3-acetic acid (IAA)-producing PGPR and Arabidopsis that contain an auxin-responsive GUS fusion suggest that plants perceive IAA released by bacteria in the rhizosphere. The role of flavonoids in the colonization of non-legumes is being assessed using transgenic Arabidopsis with altered flavonoid metabolism and using tt mutants, which lack functional versions of specific genes for flavonoid metabolism. Studies of plant defence and of stress responses are producing molecular data on plant genes induced by inoculation of Arabidopsis roots with non-pathogens.

scholarly journals Genomic Analysis of Serratia plymuthica MBSA-MJ1: A Plant Growth Promoting Rhizobacteria That Improves Water Stress Tolerance in Greenhouse Ornamentals

2021 ◽  
Vol 12 ◽  
Author(s):  
Nathan P. Nordstedt ◽  
Michelle L. Jones
Keyword(s):  
Water Stress ◽  
Plant Growth ◽  
Stress Tolerance ◽  
Stress Responses ◽  
Plant Growth Promoting Rhizobacteria ◽  
Serratia Plymuthica ◽  
Water Stress Tolerance ◽  
Plant Growth Promoting ◽  
Growth Promoting

Water stress decreases the health and quality of horticulture crops by inhibiting photosynthesis, transpiration, and nutrient uptake. Application of plant growth promoting rhizobacteria (PGPR) can increase the growth, stress tolerance, and overall quality of field and greenhouse grown crops subjected to water stress. Here, we evaluated Serratia plymuthica MBSA-MJ1 for its ability to increase plant growth and quality of Petunia × hybrida (petunia), Impatiens walleriana (impatiens), and Viola × wittrockiana (pansy) plants recovering from severe water stress. Plants were treated weekly with inoculum of MBSA-MJ1, and plant growth and quality were evaluated 2 weeks after recovery from water stress. Application of S. plymuthica MBSA-MJ1 increased the visual quality and shoot biomass of petunia and impatiens and increased the flower number of petunia after recovery from water stress. In addition, in vitro characterizations showed that MBSA-MJ1 is a motile bacterium with moderate levels of antibiotic resistance that can withstand osmotic stress. Further, comprehensive genomic analyses identified genes putatively involved in bacterial osmotic and oxidative stress responses and the synthesis of osmoprotectants and vitamins that could potentially be involved in increasing plant water stress tolerance. This work provides a better understanding of potential mechanisms involved in beneficial plant-microbe interactions under abiotic stress using a novel S. plymuthica strain as a model.

scholarly journals Characterization of Selected Plant Growth-Promoting Rhizobacteria and Their Non-Host Growth Promotion Effects

2021 ◽  
Author(s):  
Di Fan ◽  
Donald L. Smith
Keyword(s):  
Arabidopsis Thaliana ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Content Type ◽  
Host Growth ◽  
Plant Growth Promoting ◽  
Growth Promoting

There are pressing needs to reduce the use of agrochemicals, and PGPR are receiving increasing interest in plant growth promotion and disease protection. This study follows up our previous report that the four newly isolated rhizobacteria promote the growth of Arabidopsis thaliana .

scholarly journals The Plant-Growth-Promoting Rhizobacterium Paenibacillus polymyxa Induces Changes in Arabidopsis thaliana Gene Expression: A Possible Connection Between Biotic and Abiotic Stress Responses

1999 ◽  
Vol 12 (11) ◽  
pp. 951-959 ◽  
Author(s):  
Salme Timmusk ◽  
E. Gerhart H. Wagner
Keyword(s):  
Gene Expression ◽  
Arabidopsis Thaliana ◽  
Abiotic Stress ◽  
Plant Growth ◽  
Stress Responses ◽  
Biotic Stress ◽  
Paenibacillus Polymyxa ◽  
Mrna Levels ◽  
Plant Growth Promoting ◽  
Growth Promoting

This paper addresses changes in plant gene expression induced by inoculation with plant-growth-promoting rhizobacteria (PGPR). A gnotobiotic system was established with Arabidopsis thaliana as model plant, and isolates of Paenibacillus polymyxa as PGPR. Subsequent challenge by either the pathogen Erwinia carotovora (biotic stress) or induction of drought (abiotic stress) indicated that inoculated plants were more resistant than control plants. With RNA differential display on parallel RNA preparations from P. polymyxa- treated or untreated plants, changes in gene expression were investigated. From a small number of candidate sequences obtained by this approach, one mRNA segment showed a strong inoculation-dependent increase in abundance. The corresponding gene was identified as ERD15, previously identified to be drought stress responsive. Quantification of mRNA levels of several stress-responsive genes indicated that P. polymyxa induced mild biotic stress. This suggests that genes and/or gene classes associated with plant defenses against abiotic and biotic stress may be co-regulated. Implications of the effects of PGPR on the induction of plant defense pathways are discussed.

scholarly journals Evaluating the salt resistance of Arabidopsis thaliana induced by plant growth-promoting rhizobacteria (PGPR) isolated from Can Gio mangrove forest

2017 ◽  
Vol 1 (T2) ◽  
pp. 64-74
Author(s):  
Trinh Le Phuong Ngo ◽  
Thanh Nguyen Chu ◽  
Thanh Nguyen Chu ◽  
Minh Thi Thanh Hoang
Keyword(s):  
Arabidopsis Thaliana ◽  
Plant Growth ◽  
Seedling Growth ◽  
Mangrove Forest ◽  
Plant Growth Promoting Rhizobacteria ◽  
Climate Change Scenarios ◽  
Agricultural Practice ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Can Gio Mangrove

As soil salinization is a major concern of modern agriculture and an expected threat in climate change scenarios, special effort will be required for maintaining crop production under salt stress. The use of plant growth-promoting rhizobacteria (PGPR) is a promising agricultural practice to help less salt tolerant crops to maintain an acceptable level of productivity under higher salt concentrations. Here, we have isolated the PGPR from the rhizosphere soil in Can Gio Mangrove Forest, Vietnam. Fifteen isolates of bacteria were successfully isolated on medium containing 10 % NaCl. Subsequently, to investigate the effects of PGPR isolates on the growth of Arabidopsis thaliana, seeds were treated with the PGPR and observed the germination as well as the seedling growth. Under stress condition, all bacteria inhibited the germination, however, 02NP01, 04PP02 and 06NS01, identified as Bacillus thuringiensis, Vibrio and Halomonas elongata, respectively, could promote Arabidopsis thaliana seedling growth compared to the control. Further analysis found that three bacteria exhibited the ability to fix nitrogen, solubilize inorganic phosphorus and produce phytohormone-auxin. In addition, under normal condition, Bacillus and Vibrio significantly increased A. thaliana germination, after treatment with Bacillus and Vibrio the seed germination rate increased by 36.60 % and 69.76 % respectively compared to the control. Our research shows that isolated potential rhizobacterial strains may be used as an effective tool for enhancing Arabidopsis thaliana seedling growth under salinity stress.

scholarly journals Insights into Chemical Interaction between Plants and Microbes and its Potential Use in Soil Remediation

2019 ◽  
Vol 01 (04) ◽  
pp. 39-45
Author(s):  
Kaneez Fatima
Keyword(s):  
Plant Growth ◽  
Chemical Interaction ◽  
Plant Defence ◽  
Hydrolytic Enzymes ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Health ◽  
Degrading Bacteria ◽  
Plant Growth Promoting ◽  
Health Promoting ◽  
Growth Promoting

Soil bacteria are very vital and they are frequently used in production of crop. Chemical dialogues between bacteria and plant roots result in the proliferation and biofilm formation of plant growth promoting and contaminant degrading bacteria. Plant-bacterial interactions in the rhizosphere are the determinants of plant health and soil fertility. Plant growth promoting rhizobacteria (PGPR) which is also known as plant health promoting rhizobacteria (PHPR) or nodule promoting rhizobacteria (NPR). It can benefit the host plant directly by enhancing plant growth or indirectly by producing hydrolytic enzymes and by priming plant defence. This review elaborates the effect of plant and bacterial products on the remediation of contaminated soil.

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