The effective antagonistic potential of plant growth-promoting rhizobacteria against Alternaria solani-causing early blight disease in tomato plant

2020 ◽  
Vol 266 ◽  
pp. 109289 ◽  
Author(s):  
Mohamed S. Attia ◽  
Gharieb S. El-Sayyad ◽  
M. Abd Elkodous ◽  
Ahmed I. El-Batal
Keyword(s):  
Plant Growth ◽  
Tomato Plant ◽  
Early Blight ◽  
Alternaria Solani ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting ◽  
Antagonistic Potential ◽  
Growth Promoting ◽  
Blight Disease

scholarly journals Role of biochar, compost and plant growth promoting rhizobacteria in the management of tomato early blight disease

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mujahid Rasool ◽  
Adnan Akhter ◽  
Gerhard Soja ◽  
Muhammad Saleem Haider
Keyword(s):  
Plant Growth ◽  
Early Blight ◽  
Alternaria Solani ◽  
Plant Growth Promoting Rhizobacteria ◽  
Application Rate ◽  
Growth Media ◽  
Soil Substrate ◽  
Plant Growth Promoting ◽  
Growth Promoting

AbstractThe individual role of biochar, compost and PGPR has been widely studied in increasing the productivity of plants by inducing resistance against phyto-pathogens. However, the knowledge on combined effect of biochar and PGPR on plant health and management of foliar pathogens is still at juvenile stage. The effect of green waste biochar (GWB) and wood biochar (WB), together with compost (Comp) and plant growth promoting rhizobacteria (PGPR; Bacillus subtilis) was examined on tomato (Solanum lycopersicum L.) physiology and Alternaria solani development both in vivo and in vitro. Tomato plants were raised in potting mixture modified with only compost (Comp) at application rate of 20% (v/v), and along with WB and GWB at application rate of 3 and 6% (v/v), each separately, in combination with or without B. subtilis. In comparison with WB amended soil substrate, percentage disease index was significantly reduced in GWB amended treatments (Comp + 6%GWB and Comp + 3%GWB; 48.21 and 35.6%, respectively). Whereas, in the presence of B. subtilis disease suppression was also maximum (up to 80%) in the substrate containing GWB. Tomato plant growth and physiological parameters were significantly higher in treatment containing GWB (6%) alone as well as in combination with PGPR. Alternaria solani mycelial growth inhibition was less than 50% in comp, WB and GWB amended growth media, whereas B. subtilis induced maximum inhibition (55.75%). Conclusively, the variable impact of WB, GWB and subsequently their concentrations in the soil substrate was evident on early blight development and plant physiology. To our knowledge, this is the first report implying biochar in synergism with PGPR to hinder the early blight development in tomatoes.

scholarly journals Induction of resistance in chili against Sclerotium rolfsii by plant-growth-promoting rhizobacteria and Anagallis arvensis

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Warda Sharf ◽  
Arshad Javaid ◽  
Amna Shoaib ◽  
Iqra Haider Khan
Keyword(s):  
Plant Growth ◽  
Fungal Pathogen ◽  
Sclerotium Rolfsii ◽  
Plant Growth Promoting Rhizobacteria ◽  
Positive Control ◽  
Plant Survival ◽  
Southern Blight ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Blight Disease

Abstract Background Sclerotium rolfsii is a soil-borne fungal pathogen causing diseases in more than 500 plant species. It causes southern blight disease in chili. Chemical fungicides are used to control this disease, which also pollute the environment. The present study was designed to assess the potential of two species of plant-growth-promoting rhizobacteria (PGPR) viz. Bacillus megaterium and Pseudomonas fluorescence, and an allelopathic weed, Anagallis arvensis L., for the control of southern blight disease of chili. Results Initially, three PGPR strains, viz. B. megaterium OSR3, B. megaterium ZMR6, and P. fluorescence PF-097, were selected for their in vitro antagonistic assessment against S. rolfsii by dual culture technique on potato dextrose agar medium. OSR3 showed the highest antagonistic potential (68%), followed by PF-097 (54%) and ZMR6 (33%). In a pot experiment, the two best strains of PGPR, namely OSR3 and PF-097, and dried biomass of A. arvensis (DBA) in different concentrations (1, 2 and 3%) were used to manage southern blight disease of chili. In positive control treatment (S. rolfsii only), plant survival was low (73%) than the negative control (100%). OSR3, PF-097, OSR3 + 2% DBA, and PF-097 + 2% DBA significantly enhanced plant survival over positive control. The highest increase in chili growth over positive control was recorded due to OSR3, followed by PF-097 inoculations. Contents of carotenoid and chlorophyll were significantly decreased due to the fungal pathogen and improved due to PGPR strains. Application of the two PGPR strains and different concentrations of A. arvensis distinctly increased the catalase (CAT), peroxidase (POX), and polyphenol peroxidase (PPO) activities over positive control. Conclusions The present study concluded that PGPR strains B. megaterium OSR3 and P. fluorescence PF-097 can control southern blight disease effectively and increase growth and yield of chili.

scholarly journals Antagonism of plant growth promoting rhizobacteria against the causal agent of the vascular wilting of tomato

2020 ◽  
Vol 22 (2) ◽  
pp. 35-43
Author(s):  
Narmer Fernando Galeano Vanegas ◽  
Sandra Maria Marulanda Moreno ◽  
Beatriz Elena Padilla Hurtado ◽  
Javier Guillermo Mantilla Afanador ◽  
Nelson Ceballos Aguirre ◽  
...  
Keyword(s):  
Plant Growth ◽  
Burkholderia Cepacia ◽  
Growth Promotion ◽  
Selection Index ◽  
Plant Growth Promoting Rhizobacteria ◽  
Antagonistic Effect ◽  
Agricultural Systems ◽  
Plant Growth Promoting ◽  
Antagonistic Potential ◽  
Growth Promoting

Use of biotechnological potential of native microorganisms as bio-inputs is having a great impact on agricultural systems. Plant Growth Promoting Rhizobacteria (PGPR), in addition to their beneficial effect on plant growth and on the availability of soil elements, also have an antagonistic effect against different pathogens. In this study, growth promotion mechanisms with emphasis on the antagonism of PGPR isolated from sugarcane and tomato crops were evaluated. Antagonism against Fusarium oxysporum f.sp lycopersici (Fol) was determined by dual tests, inhibition of germination and production of chitinases and endoglucanases. 52 isolates were evaluated and according to their results in dual tests 10 were selected for further analysis. Isolate GIBI127 showed the best percentage of Inhibition Germination (IG) of Fol (59.29%). Then, a selection index was calculated using results from gi, dual tests and growth promotion mechanisms to select five best isolates. Finally, these bacteria were evaluated for chitinases and endoglucanases production using Miller´s method. As a result, strain GIBI419 (Burkholderia cepacia) showed a higher production of these enzymes. Selected isolates have antagonistic potential along with plant growth promotion characteristics, which can be used for the development of microbial inoculants which allow the establishment of agricultural systems for tomato cultivation that are sustainable, efficient, and environmentally friendly.

scholarly journals COMPARATIVE EFFECTS OF SOIL SOLARIZATION AND OTHER AGRIPLASTIC MULCH SYSTEMS ON INCREASED GROWTH RESPONSE AND REDUCTION OF EARLY BLIGHT DISEASE OF FLORADADE TOMATO

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 732f-732
Author(s):  
C. Stevens ◽  
V. A. Khan ◽  
M.A. Wilson ◽  
D. J. Collins ◽  
J. E. Brown ◽  
...  
Keyword(s):  
Growth Response ◽  
Early Blight ◽  
Plant Growth Promoting Rhizobacteria ◽  
Bare Soil ◽  
Tomato Plants ◽  
Tomato Yield ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Blight Disease ◽  
Increased Growth Response

Agriplastic black mulch (BM), row cover (spunbonded) plus black mulch (RBM) and solarized soil treatments plus black mulch (SBM). row cover plus black mulch on solarized soil (RSBM) and row cover plus solar&d soil (RSBS) increased Floradade tomato yield from 56 to 285%. number of tomatoes and plant height compared to the non-solarized bare soil (BS). When comparing increased growth response (IGR) of the plants grown in the solarized soil with no row cover agriplastic treatments, there was no significant differences among them. When comparing the IGR parameters of tomato plants grown under SBS, BM, and RBS there were no significant differences among them. Spunbonded row cover treatments increased IGR of tomatoes over all treatments without row cover. A significant increase in plant growth promoting rhizobacteria (PGPR) was observed in the rhizosphere soil of Floradade tomatoes grown in solarized soil alone and in those other agriplastic treatments compared to bare soil. There appear to be no differences in PGPR population among SBS and all agriplastic treatments.

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