Mechanistic insights on plant root colonization by bacterial endophytes: a symbiotic relationship for sustainable agriculture

2018 ◽  
Vol 1 (1) ◽  
pp. 25-38 ◽  
Author(s):  
Prameela Jha ◽  
Jitendra Panwar ◽  
Prabhat Nath Jha
Keyword(s):  
Sustainable Agriculture ◽  
Root Colonization ◽  
Plant Root ◽  
Symbiotic Relationship ◽  
Bacterial Endophytes

scholarly journals Deletion of Rap‐Phr systems in Bacillus subtilis influences in vitro biofilm formation and plant root colonization

2021 ◽  
Vol 10 (3) ◽  
Author(s):  
Mathilde Nordgaard ◽  
Rasmus Møller Rosenbek Mortensen ◽  
Nikolaj Kaae Kirk ◽  
Ramses Gallegos‐Monterrosa ◽  
Ákos T. Kovács
Keyword(s):  
Bacillus Subtilis ◽  
Biofilm Formation ◽  
Root Colonization ◽  
Plant Root

scholarly journals Microfluidics: Quantifying the Spatiotemporal Dynamics of Plant Root Colonization by Beneficial Bacteria in a Microfluidic Habitat (Adv. Biosys. 6/2018)

2018 ◽  
Vol 2 (6) ◽  
pp. 1870051 ◽  
Author(s):  
Jayde A. Aufrecht ◽  
Collin M. Timm ◽  
Amber Bible ◽  
Jennifer L. Morrell-Falvey ◽  
Dale A. Pelletier ◽  
...  
Keyword(s):  
Root Colonization ◽  
Plant Root ◽  
Spatiotemporal Dynamics ◽  
Beneficial Bacteria

Competitiveness in root colonization by Pseudomonas putida requires the rpoS gene

2001 ◽  
Vol 47 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Charles D Miller ◽  
Young-Cheol Kim ◽  
Anne J Anderson
Keyword(s):  
Pseudomonas Putida ◽  
Culture Medium ◽  
Wild Type Strain ◽  
Root Colonization ◽  
Plant Root ◽  
Wild Type ◽  
Rpos Gene ◽  
Activated Oxygen ◽  
Increased Sensitivity ◽  
Dose Dependent

The rpoS gene in Pseudomonas putida was essential for plant root colonization under competitive conditions from other microbes. The RpoS- mutant survived less well than the wild-type strain in culture medium, and unlike the wild-type, failed to colonize the roots in a peat matrix containing an established diverse microflora. The RpoS-deficient P. putida isolate was generated by insertion of a glucuronidase-npt cassette into the rpoS gene. The RpoS- mutant had dose-dependent increased sensitivity to oxidative stress and produced Mn-superoxide dismutase activity earlier than the parent. While extracts from wild-type P. putida stationary-phase cells contained three isozymes of catalase (CatA, CatB, and CatC), the σ38-deficient P. putida lacked CatB. These results are consistent with previous findings that CatB is induced in stationary-phase.Key words: catalase, starvation, activated oxygen species.

scholarly journals Trichoderma-Plant Root Colonization: Escaping Early Plant Defense Responses and Activation of the Antioxidant Machinery for Saline Stress Tolerance

2013 ◽  
Vol 9 (3) ◽  
pp. e1003221 ◽  
Author(s):  
Yariv Brotman ◽  
Udi Landau ◽  
Álvaro Cuadros-Inostroza ◽  
Tohge Takayuki ◽  
Alisdair R. Fernie ◽  
...  
Keyword(s):  
Plant Defense ◽  
Stress Tolerance ◽  
Root Colonization ◽  
Plant Root ◽  
Defense Responses ◽  
Saline Stress ◽  
Plant Defense Responses ◽  
Antioxidant Machinery

scholarly journals Identification of Root-Secreted Compounds Involved in the Communication Between Cucumber, the Beneficial Bacillus amyloliquefaciens, and the Soil-Borne Pathogen Fusarium oxysporum

2017 ◽  
Vol 30 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Yunpeng Liu ◽  
Lin Chen ◽  
Gengwei Wu ◽  
Haichao Feng ◽  
Guishan Zhang ◽  
...  
Keyword(s):  
Fusarium Oxysporum ◽  
Root System ◽  
Root Exudates ◽  
Bacillus Amyloliquefaciens ◽  
Root Colonization ◽  
Plant Root ◽  
Root Exudation ◽  
Soil Borne Pathogens ◽  
Split Root System ◽  
Cucumber Roots

Colonization of plant growth–promoting rhizobacteria (PGPR) is critical for exerting their beneficial effects on the plant. Root exudation is a major factor influencing the colonization of both PGPR and soil-borne pathogens within the root system. However, the tripartite interaction of PGPR, plant roots, and soil-borne pathogens is poorly understood. We screened root exudates for signals that mediate tripartite interactions in the rhizosphere. In a split-root system, we found that root colonization of PGPR strain Bacillus amyloliquefaciens SQR9 on cucumber root was significantly enhanced by preinoculation with SQR9 or the soil-borne pathogen Fusarium oxysporum f. sp. cucumerinum, whereas root colonization of F. oxysporum f. sp. cucumerinum was reduced upon preinoculation with SQR9 or F. oxysporum f. sp. cucumerinum. Root exudates from cucumbers preinoculated with SQR9 or F. oxysporum f. sp. cucumerinum were analyzed and 109 compounds were identified. Correlation analysis highlighted eight compounds that significantly correlated with root colonization of SQR9 or F. oxysporum f. sp. cucumerinum. After performing colonization experiments with these chemicals, raffinose and tryptophan were shown to positively affect the root colonization of F. oxysporum f. sp. cucumerinum and SQR9, respectively. These results indicate that cucumber roots colonized by F. oxysporum f. sp. cucumerinum or SQR9 increase root secretion of tryptophan to strengthen further colonization of SQR9. In contrast, these colonized cucumber roots reduce raffinose secretion to inhibit root colonization of F. oxysporum f. sp. cucumerinum.

scholarly journals Potential Role of Flavobacterial Gliding-Motility and Type IX Secretion System Complex in Root Colonization and Plant Defense

2014 ◽  
Vol 27 (9) ◽  
pp. 1005-1013 ◽  
Author(s):  
Max Kolton ◽  
Omer Frenkel ◽  
Yigal Elad ◽  
Eddie Cytryn
Keyword(s):  
Plant Defense ◽  
Root Colonization ◽  
Plant Protection ◽  
Plant Root ◽  
Secretion System ◽  
Gliding Motility ◽  
Wild Type ◽  
In Planta ◽  
Clavibacter Michiganensis

Members of the Flavobacterium genus are often highly abundant in the rhizosphere. Nevertheless, the physiological characteristics associated with their enhanced rhizosphere competence are currently an enigma. Flavobacteria possess a unique gliding-motility complex that is tightly associated with a recently characterized Bacteroidetes-specific type IX protein secretion system, which distinguishes them from the rest of the rhizosphere microbiome. We hypothesize that proper functionality of this complex may confer a competitive advantage in the rhizosphere. To test this hypothesis, we constructed mutant and complement root-associated flavobacterial variants with dysfunctional secretion and gliding motility, and tested them in a series of in planta experiments. These mutants demonstrated significantly lower rhizosphere persistence (approximately 10-fold), plant root colonization (approximately fivefold), and seed adhesion capacity (approximately sevenfold) than the wild-type strains. Furthermore, the biocontrol capacity of the mutant strain toward foliar-applied Clavibacter michiganensis was significantly impaired relative to the wild-type strain, suggesting a role of the gliding and secretion complex in plant protection. Collectively, these results provide an initial link between the high abundance of flavobacteria in the rhizosphere and their unique physiology, indicating that the flavobacterial gliding-motility and secretion complex may play a central role in root colonization and plant defense.

scholarly journals Pseudomonas fluorescens F113 Can Produce a Second Flagellar Apparatus, Which Is Important for Plant Root Colonization

2016 ◽  
Vol 7 ◽  
Author(s):  
Emma Barahona ◽  
Ana Navazo ◽  
Daniel Garrido-Sanz ◽  
Candela Muriel ◽  
Francisco Martínez-Granero ◽  
...  
Keyword(s):  
Pseudomonas Fluorescens ◽  
Root Colonization ◽  
Plant Root ◽  
Flagellar Apparatus
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