scholarly journals Bacillus spp. as Biocontrol Agents of Root Rot and Phytophthora Blight on Ginseng

2004 ◽  
Vol 20 (1) ◽  
pp. 63-66 ◽  
Author(s):  
Yeoung-Seuk Bae ◽  
Kyungseok Park ◽  
Choong-Hoe Kim
Keyword(s):  
Root Rot ◽  
Biocontrol Agents ◽  
Phytophthora Blight ◽  
Bacillus Spp

Exploration of Endophytes from Alfalfa (Medicago sativa L.) as Biocontrol Agents

2020 ◽  
pp. 1-8
Author(s):  
Beilei Wu ◽  
Beilei Wu ◽  
Mei Li ◽  
Xiaoli Chen ◽  
Xiliang Jiang ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Root Rot ◽  
Agricultural Production ◽  
Biocontrol Agents ◽  
Bacillus Spp ◽  
Medicago Sativa L ◽  
The Common ◽  
Seedling Germination ◽  
Germination Experiments ◽  
Alfalfa Root

Endophytes are increasingly investigated as biocontrol agents for agricultural production. The identification of new endophytes with high effectiveness against plant disease is very important. A total of 362 strains of endophytes, including fungi, bacteria, and actinomycete, were isolated from alfalfa (Medicago sativa L.) collected in Hebei, Inner Mongolia and Ningxia provinces of China. The three strains of endophytic bacteria (NA NX51R-5, NA NX90R-8, and NA NM1S-1) with strong biocontrol capability with >50% effectiveness were screened against the common alfalfa root rot pathogen Fusarium oxysporum F. sp. medicaginis in alfalfa seedling germination experiments on MS medium and pot experiments. Using phylogenetic analysis, the isolates of NA NM1S-1 and NA NX51R-5 were identified as Bacillus spp. by 16S rDNA, while NA NX90R-8 was found to be Pseudomonas sp.

scholarly journals In-vitro compatibility assay of indigenous Trichoderma and Pseudomonas species and their antagonistic activities against black root rot disease (Fusarium solani) of faba bean (Vicia faba L.)

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Alemayehu Dugassa ◽  
Tesfaye Alemu ◽  
Yitbarek Woldehawariat
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Pseudomonas Fluorescens ◽  
Faba Bean ◽  
Fusarium Solani ◽  
Root Rot ◽  
Mycelial Growth ◽  
Biocontrol Agents ◽  
Black Root Rot ◽  
Root Rot Disease ◽  
Rot Disease

Abstract Background Faba bean (Vicia faba L.) cultivation is highly challenged by faba bean black root rot disease (Fusarium solani) in high lands of Ethiopia. To ensure sustainable production of faba beans, searching for eco-friendly disease management options is necessary to curb the progress of the disease timely. The indigenous biocontrol agents that suit local environments may effectively strive with in-situ microorganisms and suppress local pathogen strains. This study aimed to screen antagonistic indigenous compatible Trichoderma and Pseudomonas strains against Fusarium solani. In the pathogenicity test, soil-filled pots were arranged in complete random block design and sown with health faba bean seeds. The effect of some fungicides was evaluated against Fusarium by food poisoning methods to compare with the biocontrol agents. The antagonistic efficacy of biocontrol agents and their compatibility was investigated on Potato dextrose agar medium. Results Fusarium solani AAUF51 strain caused an intense root rotting in faba bean plant. The effect of Mancozeb 80% WP at 300 ppm was comparable with Trichoderma and Pseudomonas strains against Fusarium. The mycelial growth of test the pathogen was significantly (P ≤ 0.05) reduced to 86.67 and 85.19% by Trichoderma harzianum AAUW1 and Trichoderma viridae AAUC22 strains in dual culture, respectively. The volatile metabolites of Pseudomonas aeruginosa AAUS31 (77.78%) found the most efficient in reducing mycelial growth of Fusarium followed by Pseudomonas fluorescens AAUPF62 (71.11%) strains. The cell-free culture filtrates of Pseudomonas fluorescens AAUPF62 and Pseudomonas aeruginosa AAUS31 were more efficient than the Trichoderma strain in reducing the growth of Fusarium isolates. There was no zone of inhibition recorded between Trichoderma harzianum AAUW1, Trichoderma viridae AAUC22, Pseudomonas aeruginosa AAUS31, and Pseudomonas fluorescens AAUPF62 strains, hence they were mutually compatible. Conclusions The compatible Trichoderma and Pseudomonas strains showed antagonistic potentiality that could be explored for faba bean protection against black root rot disease and might have a future dual application as biocontrol agents.

scholarly journals Rhizospheric bacteria as potential biocontrol agents against Fusarium wilt and crown and root rot diseases in tomato

2021 ◽  
Author(s):  
Md. Masudur Rahman Khalil ◽  
Rosario Alicia Fierro-Coronado ◽  
Ofelda Peñuelas-Rubio ◽  
Alma Guadalupe Villa-Lerma ◽  
Rigoberto Plascencia-Jatomea ◽  
...  
Keyword(s):  
Fusarium Wilt ◽  
Root Rot ◽  
Biocontrol Agents ◽  
Rhizospheric Bacteria ◽  
Crown And Root Rot

Promising biocontrol agents isolated from medicinal plants rhizosphere against root-rot fungi

2018 ◽  
Vol 15 ◽  
pp. 11-18 ◽  
Author(s):  
Moustafa M. Zohair ◽  
Ahmed A. El-Beih ◽  
Mahmoud W. Sadik ◽  
Eman R. Hamed ◽  
Mohamed Z. Sedik
Keyword(s):  
Medicinal Plants ◽  
Root Rot ◽  
Biocontrol Agents

Bio-based and Reduced-Risk Strategies for the Management of Phytophthora Blight and Root Rot of Pepper

2016 ◽  
pp. 163-175
Author(s):  
Yan Ma ◽  
Qiujun Wang ◽  
Yun Cao ◽  
Guangfei Wang ◽  
Dejie Guo ◽  
...  
Keyword(s):  
Root Rot ◽  
Phytophthora Blight ◽  
Reduced Risk

scholarly journals The Significance of Bacillus spp. in Disease Suppression and Growth Promotion of Field and Vegetable Crops

2020 ◽  
Vol 8 (7) ◽  
pp. 1037 ◽  
Author(s):  
Dragana Miljaković ◽  
Jelena Marinković ◽  
Svetlana Balešević-Tubić
Keyword(s):  
Plant Growth ◽  
Plant Pathogens ◽  
Growth Promotion ◽  
Disease Suppression ◽  
Biocontrol Agents ◽  
Systemic Resistance ◽  
Steady Increase ◽  
Vegetable Crops ◽  
Wide Range ◽  
Bacillus Spp

Bacillus spp. produce a variety of compounds involved in the biocontrol of plant pathogens and promotion of plant growth, which makes them potential candidates for most agricultural and biotechnological applications. Bacilli exhibit antagonistic activity by excreting extracellular metabolites such as antibiotics, cell wall hydrolases, and siderophores. Additionally, Bacillus spp. improve plant response to pathogen attack by triggering induced systemic resistance (ISR). Besides being the most promising biocontrol agents, Bacillus spp. promote plant growth via nitrogen fixation, phosphate solubilization, and phytohormone production. Antagonistic and plant growth-promoting strains of Bacillus spp. might be useful in formulating new preparations. Numerous studies of a wide range of plant species revealed a steady increase in the number of Bacillus spp. identified as potential biocontrol agents and plant growth promoters. Among different mechanisms of action, it remains unclear which individual or combined traits could be used as predictors in the selection of the best strains for crop productivity improvement. Due to numerous factors that influence the successful application of Bacillus spp., it is necessary to understand how different strains function in biological control and plant growth promotion, and distinctly define the factors that contribute to their more efficient use in the field.

Yeasts and Bacillus spp. as potential biocontrol agents of Sclerotinia sclerotiorum in garlic

2020 ◽  
Vol 261 ◽  
pp. 108931 ◽  
Author(s):  
Vytória Piscitelli Cavalcanti ◽  
Neilton Antonio Fiusa Araújo ◽  
Natália Bernardes Machado ◽  
Paulo Sérgio Pedroso Costa Júnior ◽  
Moacir Pasqual ◽  
...  
Keyword(s):  
Sclerotinia Sclerotiorum ◽  
Biocontrol Agents ◽  
Bacillus Spp

scholarly journals Improvment Biocontrol of Damping-Off and Root Rot/Wilt of Faba Bean by Salicylic Acid and Hydrogen Peroxide

2013 ◽  
Vol 2 (1) ◽  
pp. 14-24
Author(s):  
Montaser F. Abdel-Monaim
Keyword(s):  
Hydrogen Peroxide ◽  
Salicylic Acid ◽  
Faba Bean ◽  
Root Rot ◽  
Yield Components ◽  
Growth Parameters ◽  
Biocontrol Agents ◽  
Damping Off ◽  
Chemical Inducers ◽  
Bean Plants

Rhizoctonia solani, Fusarium solani, F. oxysporum and Macrophomina phaseolina were found to be associated with root rot and wilt symptoms of faba bean plants collected from different fields in New Valley governorate, Egypt. All the obtained isolates were able to attack faba bean plants (cv. Giza 40) causing damping-off and root rot/wilt diseases. R. solani isolates 2 and 5, F. solani isolate 8, F. oxysporum isolate 12 and M. phaseolina isolate 14 were the more virulent ones in the pathogenicity tests. Biocontrol agents (Trichoderma viride, Bacillus megaterium) and chemical inducers (salicylic acid and hydrogen peroxide) individually or in combination were examined for biological control of damping-off and root rot/wilt and growth promotion of faba bean plants in vitro and in vivo. Both antagonistic biocontrol agents and chemical inducers either individually or in combination inhibited growth of the tested pathogenic fungi.Biocontrol agents combined with chemical inducers recorded the highest inhibited growth especially in case SA + T. viride and SA+ B. megaterium. Under green house and field conditions, all treatments significantly reduced damping-off and root rot/ wilt severity and increased survival of plants. Also, these treatments increased fresh and dry weights of the survived plants in pots compared with control.  The combination of biocontrol agents and chemical inducers were more effective than using them individually and SA+ T. viride was the best treatment in this respect. Under field conditions, all these treatments significantly increased growth parameters (plant height and No. of branches plant-1) and yield components (No. of pods and seedsplant-1, weight of 100 seeds and total yield feddan-1 and protein content in both seasons (2010-2011 and 2011-2012). Faba bean seeds soaked in SA+ T. viride and SA+ B. megaterium were recorded the highest growth parameters and yield components. Generally, the combination of biocontrol agents and chemical inducers recoded the best results for controlling damping-off and root rot/wilt diseases in greenhouse and field with addition improved plant growth and increased yield components in the field. 

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