Biocontrol Potential Against Fusarium oxysporum f. sp. lycopersici and Alternaria solani and Tomato Plant Growth Due to Plant Growth–Promoting Rhizobacteria

2017 ◽  
Vol 23 (4) ◽  
pp. 294-303 ◽  
Author(s):  
Parasuraman Paramanandham ◽  
Jobina Rajkumari ◽  
Subhaswaraj Pattnaik ◽  
Siddhardha Busi
Keyword(s):  
Plant Growth ◽  
Fusarium Oxysporum ◽  
Tomato Plant ◽  
Alternaria Solani ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Biocontrol Potential

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 Screening and Biocontrol Potential of Rhizobacteria Native to Gangetic Plains and Hilly Regions to Induce Systemic Resistance and Promote Plant Growth in Chilli against Bacterial Wilt Disease

Plants ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2125
Author(s):  
Abhijeet Kashyap ◽  
Nazia Manzar ◽  
Mahendra Rajawat ◽  
Amit Kesharwani ◽  
Ravinder Singh ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Plant Growth ◽  
Bacterial Wilt ◽  
Ralstonia Solanacearum ◽  
Growth Parameters ◽  
Plant Growth Promoting Rhizobacteria ◽  
Wilt Disease ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Biocontrol Potential

Plant growth-promoting rhizobacteria (PGPR) is a microbial population found in the rhizosphere of plants that can stimulate plant development and restrict the growth of plant diseases directly or indirectly. In this study, 90 rhizospheric soil samples from five agro climatic zones of chilli (Capsicum annuum L.) were collected and rhizobacteria were isolated, screened, and characterized at morphological, biochemical, and molecular levels. In total, 38% of rhizobacteria exhibited the antagonistic capacity to suppress Ralstonia solanacearum growth and showed PGPR activities such as indole acetic acid production by 67.64% from total screened rhizobacteria isolates, phosphorus solubilization by 79.41%, ammonia by 67.75%, HCN by 58.82%, and siderophore by 55.88%. We performed a principal component analysis depicting correlation and significance among plant growth-promoting activities, growth parameters of chilli, and rhizobacterial strains. Plant inoculation studies indicated a significant increase in growth parameters, and PDS1 strain showed maximum 71.11% biocontrol efficiency against wilt disease. The best five rhizobacterial isolates demonstrating both plant growth-promotion traits and biocontrol potential were characterized and identified as PDS1—Pseudomonas fluorescens (MN368159), BDS1—Bacillus subtilis (MN395039), UK4—Bacillus cereus (MT491099), UK2—Bacillus amyloliquefaciens (MT491100), and KA9—Bacillus subtilis (MT491101). These rhizobacteria have the potential natural elicitors to be used as biopesticides and biofertilizers to improve crop health while warding off soil-borne pathogens. The chilli cv. Pusa Jwala treated with Bacillus subtilis KA9 and Pseudomonas fluorescens PDS1 showed enhancement in the defensive enzymes PO, PPO, SOD, and PAL activities in chilli leaf and root tissues, which collectively contributed to induced resistance in chilli plants against Ralstonia solanacearum. The induction of these defense enzymes was found higher in leave tissues (PO—4.87-fold, PP0—9.30-fold, SOD—9.49-fold, and PAL—1.04-fold, respectively) in comparison to roots tissue at 48 h after pathogen inoculation. The findings support the view that plant growth-promoting rhizobacteria boost defense-related enzymes and limit pathogen growth in chilli plants, respectively, hence managing the chilli bacterial wilt.

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