scholarly journals Enterobacteria isolated from an agricultural soil of Argentina promote plant growth and biocontrol activity of plant pathogens

2019 ◽  
Vol 118 (2) ◽  
pp. 022
Author(s):  
Silvina López ◽  
Graciela Pastorino ◽  
Ismael Malbran ◽  
Pedro Balatti
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Agricultural Soil ◽  
Plant Pathogens ◽  
Buenos Aires ◽  
Indol Acetic Acid ◽  
Biocontrol Activity ◽  
The Media ◽  
Promote Plant Growth ◽  
Tres Arroyos

Bacteria promote growth by different mechanisms like phosphate (Pi) solubilization, Indol Acetic Acid (IAA) synthesis and siderophores production. The purpose of this study was to isolate bacteria that promote the growth of plants and may also act as antagonistic organisms of plant pathogens. Pi solubilizing microorganisms that were isolated from the soils of Tres Arroyos, Buenos Aires; were also able to synthesize IAA and produce siderophores. The ability of these bacteria to solubilize Pi was directly related with the synthesis of organic acids that lowered the pH and was not related with phosphatase activity. The ability of the organisms to solubilize Pi was indirectly related with the amount of soluble Pi present in the media. Though Pi solubilizing microorganisms are mainly associated with the rhizoplane exudates, in this case did not induce Pi solubilization. In addition to promote plant growth, these bacteria proved to be antagonistic of plant pathogens such as Fusarium graminearum and F. solani.

The entomopathogenic fungi Metarhizium brunneum and Beauveria bassiana promote systemic immunity and confer resistance to a broad range of pests and pathogens in tomato

2021 ◽  
Author(s):  
Rupali Gupta ◽  
Ravindran Keppanan ◽  
Meirav Leibman-Markus ◽  
Dalia Rav David ◽  
Yigal Elad ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Plant Growth ◽  
Beauveria Bassiana ◽  
Entomopathogenic Fungi ◽  
Plant Pathogens ◽  
Plant Immunity ◽  
Systemic Immunity ◽  
Metarhizium Brunneum ◽  
Promote Plant Growth ◽  
Arthropod Pests

Biocontrol agents can control pathogens by re-enforcing systemic plant resistance through systemic acquired resistance (SAR) or induced systemic resistance (ISR). Trichoderma spp. can activate the plant immune system through ISR, priming molecular mechanisms of defense against pathogens. Entomopathogenic fungi (EPF) can infect a wide range of arthropod pests, and play an important role in reducing pests' population. Here, we investigated the mechanisms by which EPF control plant diseases. We tested two well studied EPF, Metarhizium brunneum isolate Mb7 and Beauveria bassiana as the commercial product Velifer, for their ability to induce systemic immunity and disease resistance against several fungal and bacterial phytopathogens, and their ability to promote plant growth. We compared the activity of these EPF to an established biocontrol agent, T. harzianum T39, a known inducer of systemic plant immunity and broad disease resistance. The three fungal agents were effective against several fungal and bacterial plant pathogens and arthropod pests. Our results indicate that EPF induce systemic plant immunity and disease resistance by activating the plant host defense machinery, as evidenced by increases in reactive oxygen species (ROS) production and defense gene expression, and that EPF promote plant growth. EPF should be considered as control means for Tuta absoluta. We demonstrate that, with some exceptions, biocontrol in tomato can be equally potent by the tested EPF and T. harzianum T39, against both insect pests and plant pathogens. Taken together, our findings suggest that EPF may find use in broad-spectrum pest and disease management and as plant growth promoting agents.

scholarly journals Actinomycetes, promising tools to control plant diseases and to promote plant growth

2005 ◽  
Vol 82 (3) ◽  
pp. 85-102 ◽  
Author(s):  
C.L. Doumbou ◽  
M.K. Hamby Salove ◽  
D.L. Crawford ◽  
C. Beaulieu
Keyword(s):  
Plant Growth ◽  
Plant Pathogens ◽  
Soil Microbial Biomass ◽  
Extracellular Enzymes ◽  
Control Plant ◽  
Plant Diseases ◽  
Soil Microbial ◽  
Plant Growth Promoting ◽  
Promote Plant Growth ◽  
Growth Promoting

Actinomycetes represent a high proportion of the soil microbial biomass and have the capacity to produce a wide variety of antibiotics and of extracellular enzymes. Several strains of actinomycetes have been found to protect plants against plant diseases. This review focuses on the potential of actinomycetes as (a) source of agroactive compounds, (b) plant growth promoting organisms, and (c) biocontrol tools of plant diseases. This review also addresses examples of biological control of fungal and bacterial plant pathogens by actinomycetes species which have already reached the market or are likely to be exploited commercially within the next few years.

scholarly journals A Community Effort: Combining Functional Amplicon Sequencing and Metagenomics Reveals Potential Biosynthetic Gene Clusters Associated with Protective Phenotypes in Rhizosphere Microbiomes

mSystems ◽  
2021 ◽  
Author(s):  
Jaclyn M. Winter
Keyword(s):  
Plant Growth ◽  
Plant Pathogens ◽  
Gene Clusters ◽  
Amplicon Sequencing ◽  
Plant Roots ◽  
Biosynthetic Gene ◽  
Biosynthetic Gene Clusters ◽  
First Line ◽  
Community Effort ◽  
Promote Plant Growth

Soil-dwelling microorganisms associated with plant roots carry out essential processes that promote plant growth and productivity. In addition to these beneficial functions, the rhizosphere microbiome also serves as the first line of defense against many plant pathogens.

Promotion of plant growth and inhibition of enzymic degradation of indole-3-acetic acid by metabolites of carbofuran, a carbamate insecticide

1977 ◽  
Vol 55 (5) ◽  
pp. 574-579 ◽  
Author(s):  
T. T. Lee
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Inhibitory Action ◽  
Critical Level ◽  
Growth Promotion ◽  
Stem Segment ◽  
Stem Tissue ◽  
Carbamate Insecticide ◽  
Promote Plant Growth ◽  
Indole 3 Acetic Acid

The carbamate insecticide carbofuran (2,2-dimethyl-2,3-dihydrobenzofuranyl-7-N-methyl carbamate) and three of its metabolites (7-hydroxy-2,2-dimethyl-2,3-dihydrobenzofuran (III), 3,7-dihydroxy-2,2-dimethyl-2,3-dihydrobenzofuran (IV), and 3-keto-7-hydroxy-2,2-dimethyl-2,3-dihydrobenzofuran (V)) stimulated growth in the pea stem segment assay in the presence, but not absence, of a low concentration of indole-3-acetic acid (IAA). The metabolites were more active than carbofuran itself. The synergistic effect on growth was specific with IAA since it was not observed in the presence of other auxins.Metabolites III, IV, and V and, to a lesser degree, carbofuran were found to be inhibitory to IAA degradation catalyzed by pea stem tissue or purified horseradish peroxidase (EC 1.11.1.7). Comparison of the relative activities of the compounds in the inhibition of IAA degradation and in the promotion of plant growth suggests a causal relationship. The implication is that carbofuran may promote plant growth through the inhibitory action of its metabolites on enzymic breakdown of IAA, thus preserving a critical level of IAA required for growth promotion.

scholarly journals Possible roles of both abscisic acid and indol-acetic acid in controlling grape berry ripening process

OENO One ◽  
2007 ◽  
Vol 41 (3) ◽  
pp. 141 ◽  
Author(s):  
Christelle Deytieux-Belleau ◽  
Séverine Gagne ◽  
Annie L'Hyvernay ◽  
Bernard Donèche ◽  
Laurence Geny
Keyword(s):  
Acetic Acid ◽  
Abscisic Acid ◽  
Plant Growth ◽  
Growth Regulators ◽  
Grape Berry ◽  
Ripening Process ◽  
Hormonal Profile ◽  
Indol Acetic Acid ◽  
Berry Ripening ◽  
Grape Berry Ripening

<p style="text-align: justify;"><strong>Aims</strong>: The objective was to better understand the mechanisms involved in grape ripening that brings about important changes in the physiology and chemistry of the fruit. So we focused on the involvement of two growth regulators: abscisic acid (ABA) and indol-acetic acid (IAA) in controlling grape berry ripening process.</p><p style="text-align: justify;"><strong>Methods and results</strong>: We described the evolution of the two plant growth regulators during the development of cv. Merlot grapes (Vitis vinifera L.). In order to better understand the role of ABA and IAA in the ripening control, these two growth regulators were applied on the grapes at the onset of veraison. The hormonal profile was established on treated berries and different physiological parameters were assayed to evaluate the effects of both applications. The partitioning of both plant growth regulators in nontreated berries showed that ABA and IAA accumulated at the onset of ripening. Moreover, it appeared that endogenous ABA decreased progressively in the flesh while accumulated in the skin from the beginning of the colour change to maturity. The hormonal treatments modified the hormonal profile and several physiological parameters: sugar, acidity, colour, and Botrytis sensibility.</p><p style="text-align: justify;"><strong>Conclusion</strong>: These findings suggest that both treatments have modified the ripening process. Exogenous ABA has induced advancement in grape ripening, while IAA application has delayed this process. These observations support the view that the grape ripening process may be influenced by the hormonal status.</p><p style="text-align: justify;"><strong>Significance and impact of study</strong>: This study gives new information about the ripening control of the non-climacteric fruits. In grape berries, it provides evidence of a possible co-involvement of ABA and IAA in controlling ripening process.</p>

scholarly journals Estimation levels of Indol acetic acid (IAA) and Gibberellic acid (GA3) from dry bakery yeast Saccharomyces cereviciae

2010 ◽  
Vol 4 (2) ◽  
pp. 94-100
Author(s):  
Arwa A Tawfiq
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Gibberellic Acid ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Indol Acetic Acid ◽  
Bakery Yeast

The level of endogenous free, bound and total auxin (Indol-3-acitic acid, IAA) and gibberellic acid (GA3) were examined in dry bakery yeast. For determination of the levels of these plant growth regulators level, used spectrophotometer. The results show that Saccharomyces cereviciae was produced IAA and GA3. IAA level was 29.86 µg/ml, 198 µg/ml at 222nm and 280nm wavelengths respectively and GA3 level was 799 µg/ml at 254nm.

scholarly journals Screening of Potential Plant Growth Promoting Properties of Bacillus Species Isolated from Different Regions of Nepal

2021 ◽  
Vol 9 (1) ◽  
pp. 79-84
Author(s):  
Enish Pathak ◽  
Arjun Sanjyal ◽  
Chhatra Raj Regmi ◽  
Saroj Paudel ◽  
Anima Shrestha
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Hydrogen Cyanide ◽  
Indole Acetic Acid ◽  
Agricultural Sector ◽  
Bacillus Species ◽  
Chemical Fertilizers ◽  
Plant Growth Promoting ◽  
Promote Plant Growth ◽  
Growth Promoting

The deleterious effects of intensive use of chemical fertilizers and pesticides in agriculture has led to the substantial research efforts on finding the alternatives to these agrochemicals. This study was aimed to isolate Bacillus species from soil of different regions of Nepal and screen for their ability to promote plant growth directly or indirectly by testing their ability to produce plant growth hormone indole acetic acid, hydrogen cyanide, ammonia and protease as well as phosphate solubilization. Thirty nine Bacillus strains were isolated from 25 soil samples of different regions of Kathmandu and Chitwan districts of Nepal. These isolates were tested for plant growth promoting traits in vitro. Among the total isolates, about 48.7% were indole acetic acid producers, 38.4% of the isolates showed the ability to solubilize the phosphate, 71.8% were able to produce ammonia and all the isolates had the ability to produce hydrogen cyanide and protease. The isolated strains showed positive results to maximum PGPR traits and exhibited a potential to be used as alternatives to chemical fertilizers and pesticides and could be used as low-cost bio-based technology to promote plant growth in the agricultural sector.

scholarly journals Potensi Bakteri Endofit Ubi Jalar (Ipomoea batatas L.) dalam Menghasilkan Hormon Indole Acetic Acid (IAA) dengan Penambahan L-triptofan

2020 ◽  
Vol 10 (1) ◽  
pp. 21
Author(s):  
Agustina Monalisa Tangapo
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Sweet Potato ◽  
Growth Regulators ◽  
Endophytic Bacteria ◽  
Ipomoea Batatas ◽  
Indole Acetic Acid ◽  
Iaa Production ◽  
Promote Plant Growth ◽  
Indole 3 Acetic Acid

Potensi Bakteri Endofit Ubi Jalar (Ipomoea batatas L.) dalam Menghasilkan Hormon Indole Acetic Acid (IAA) dengan Penambahan L-triptofan(Potential of endophytic bacteria of sweet potato (Ipomoea batatas L.) in producing Indole Acetic Acid (IAA) with the addition of L-tryptophan) Agustina Monalisa TangapoProgram Studi Biologi FMIPA Universitas Sam RatulangiJl. Kampus Unsrat, Manado 95115*Email korespondensi:[email protected] (Article History: Received 5-01-2019; Revised 15-01-2020; Accepted 05-02-2020) ABSTRAKAsosiasi bakteri-tanaman, dapat mempengaruhi produktivitas tanaman secara langsung dan tidak langsung. Secara langsung, salah satunya yaitu bakteri dapat memproduksi dan menyekresikan zat pengatur tumbuh indole-3-acetic acid (IAA, auksin). Penelitian ini bertujuan untuk menguji kemampuan bakteri endofit ubi jalar dalam menghasilkan IAA. Metode analisis IAA dilakukan dengan metode kolorimetri. Analisis produksi IAA dilakukan dengan penambahan dan tanpa penambahan L-triptofan. Hasil penelitian menunjukkan bahwa tanpa penambahan L-triptofan, diperoleh sejumlah 19 jenis yang menghasilkan IAA dengan kisaran konsentrasi 0,29-7,21 mg/L. Dengan penambahan L-triptofan, jumlah jenis positif dan konsentrasi IAA yang dihasilkan meningkat signifikan. Jumlah jenis positif 20 jenis (91%) dan konsentrasi IAA yang dihasilkan mencapai kisaran 0,96-115,63 mg/L.Kata kunci: bakteri endofit; IAA; ubi jalar; L-triptofan ABSTRACTPlant-bacteria associations, can promote plant growth by both direct and indirect mechanisms. One of direct mechanisms is that bacteria can produce and secrete indole-3-acetic acid (IAA, auxin) growth regulators. This study aims to examine the ability of sweet potato endophytic bacteria to produce IAA. The detection of IAA production was conducted by colorimetric technique. IAA production analysis was carried out with addition and without addition of L-tryptophan. Without the addition of L-tryptophan, a total of 19 species produced IAA with a concentration range of 0.29-7.21 mg/L. With the addition of L-tryptophan, the number of positive species and the concentration of IAA produced increased significantly. The number of positive species was 20 species (91%) and the concentration of IAA produced reached a range of 0.96-115.63 mg/L.Keywords: endophytes bacterial; IAA; sweet potato; L-tryptophan

scholarly journals INDIGENOUS RHIZOBACTERIA SCREENING FROM TOMATO TO CONTROL Ralstonia syzigii subsp. indonesiensis AND PROMOTE PLANT GROWTH RATE AND YIELD

2019 ◽  
Vol 18 (2) ◽  
pp. 177
Author(s):  
Yulmira Yanti ◽  
Hasmiandy Hamid ◽  
Reflin Reflin
Keyword(s):  
Growth Rate ◽  
Plant Growth ◽  
Bacterial Wilt ◽  
Plant Pathogens ◽  
Wilt Disease ◽  
Growth Enhancement ◽  
Bacterial Wilt Disease ◽  
Promote Plant Growth ◽  
Phosphate Solubilizing ◽  
Selection Of

Indigenous rhizobacteria screening from tomato to control Ralstonia syzigii subsp. indonesiensis and promote plant growth rate and yield. Bacterial wilt is the most damaging vascular pathogen on tomato and many other crops in tropical, subtropical and warm temperate areas of the world which limits the production. Rhizobacteria have been concerned as potential biological control agents due to their ability to promote plant growth and health, and their role as antagonists of plant pathogens. The purpose of this research was to screen the best indigenous rhizobacteria (IRB) that able to control bacterial wilt disease and increase growth rate and yield of tomato plant. This research was conducted in 3 stages: (1) Isolation and selection of indigenous rhizobacteria as PGPR on tomato seedlings, consisted of 27 IRB isolates and a control, with triplications; (2) Selection of IRB isolates that control R. syzigii subsp. indonesiensis on tomato plants, which consisted of 8 treatments including 7 IRB and a control with 5 replications; (3) Characterization of IRB isolates ability to promote plant growth (indicated with IAA production & phosphate solubilizing). The variables observed were disease development, growth enhancement and IRB isolate ability to produce IAA and solubilize phosphate. The results showed that all IRB isolates were able to control bacterial wilt disease and increase the growth rate and yield of tomato. IR2.3.5, IR1.3.4 and IR1.4.2 were the best isolates in controlling R. syzigii subsp. indonesiensis and increasing the growth rate and yield by 81.25% and 68.72% respectively. All isolates showed various abilities to produce IAA, however, only isolates IR2.3.5 and IR1.3.4 that had abilities to solubilize phosphate.

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