KEMAMPUAN EKSTRAK SENYAWA AKTIF BAKTERI ENDOFIT DALAM MENGHAMBAT PERTUMBUHAN Fusarium oxysporum f.sp. PADA KELAPA SAWIT

Ability of Active Compound Extract of Endophytic Bacteria to Inhibit the Growth of Fusarium oxysporum f.sp. in Oil Palm ABSTRACTWilt vessels disease in oil palm plants is caused by Fusarium oxysporum f.sp. This disease is very harmful because of its ability to kill the infected oil palm plant in less than a year. Endophytic bacteria are likely to be biological controllers for the disease because of their ability to produce bioactive antifungal compounds. Isolation of endophytic bacteria from oil palm plant and activity test of their active compounds against F. oxysporum f.sp. in vitro had been done. Antagonistic test of endophytic bacterial isolates against F. oxysporum f.sp. was carried out using a double culture method. The potential endophytic bacterial isolates were extracted using ethyl acetate solvent for their active compounds, which were then tested for its activity in inhibiting the growth of F. oxysporum f.sp. The results showed that the active compound extract of B11 endophytic bacteria with the incubation time of 24 and 54 hours gave the growth inhibition of F. oxysporum f.sp. at the level of 29.23% and 43.85%, respectively.Keywords: antagonistic test, bioactive compound, endophytic bacteria, F. oxysporum f.sp., oil palm ABSTRAKPenyakit layu pembuluh pada tanaman kelapa sawit disebabkan oleh Fusarium oxysporum f.sp. Penyakit ini menjadi penyebab kematian tanaman kelapa sawit yang telah terinfeksi dalam waktu kurang dari setahun. Bakteri endofit asal tanaman kelapa sawit dimungkinkan menjadi pengendali hayati bagi penyakit ini karena kemampuan bakteri tersebut memproduksi senyawa bioaktif yang bersifat antifungi. Isolasi bakteri endofit dari tanaman kelapa sawit dan uji aktivitas senyawa aktifnya terhadap F. oxysporum f.sp. secara in vitro telah dilakukan. Uji antagonis isolat bakteri endofit terhadap jamur patogen F. oxysporum f.sp. menggunakan metode kultur ganda. Isolat bakteri endofit potensial diekstrak senyawa aktifnya dengan menggunakan pelarut etil asetat, kemudian senyawa aktif ini diuji aktivitasnya dalam menghambat pertumbuhan jamur patogen F. oxysporum f.sp. Hasil penelitian menunjukkan bahwa ekstrak senyawa aktif bakteri endofit B11 dengan waktu inkubasi 24 dan 54 jam memberikan daya hambat terhadap F. oxysporum f.sp. sebesar masing-masing 29,23% dan 43,85%.Kata Kunci: bakteri endofit, F. oxysporum f.sp., kelapa sawit, senyawa aktif, uji antagonis

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ASAI KEMAMPUAN BAKTERI ENDOFIT DARI KACANG TANAH DALAM MENGHAMBAT PERTUMBUHAN Sclerotium sp. PADA KECAMBAH KACANG TANAH

JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA ◽

10.23960/j.hptt.214178-186 ◽

2020 ◽

Vol 14 (2) ◽

pp. 178-186

Author(s):

Lisa Novita Arios ◽

Dwi Suryanto . ◽

Kiki Nurtjahja . ◽

Erman Munir .

Keyword(s):

Endophytic Bacteria ◽

Culture Method ◽

Dry Weight ◽

Dual Culture ◽

Seedling Height ◽

Bacterial Isolates ◽

Peanut Seed ◽

Number Of Leaves

Assay on ability of endophytic bacteria isolated from peanut to inhibit Sclerotium sp. growth in peanut seedlings. A study on assay of ability of endophytic bacteria to inhibit Sclerotium sp. in peanut seedling has been done. The bacteria were isolated from peanut healthy plants, while Sclerotium sp. was isolated from infected peanaut plant. Antagonistic assay was conducted by dual culture method. In vivo assay of inhibiting Sclerotium sp. was conducted by dipping peanut seed in bacterial solution, and planting the seed in soil:compost (3:1) growing media. Six endophytic bacterial isolates showed to inhibit the growth of Sclerotium sp. in vitro. LN1 seemed to inhibit more of Sclerotium sp., while LN5 showed to inhibit less. Two potential isolates LN1 of gram-negative and LN2 of gram-positive using for further study showed to decrease more of dumping off. It also seemed that the isolates increased the seedling height, number of leaves, and dry weight.

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Unraveling the Metabolite Signature of Endophytic Bacillus velezensis Strain Showing Defense Response Towards Fusarium oxysporum

Agronomy ◽

10.3390/agronomy11040683 ◽

2021 ◽

Vol 11 (4) ◽

pp. 683

Author(s):

Yang Cao ◽

Wei Ding ◽

Chang Liu

Keyword(s):

Fusarium Oxysporum ◽

Inhibitory Activity ◽

Defense Response ◽

Endophytic Bacteria ◽

Rice Seedling ◽

Seedling Blight ◽

Bacillus Velezensis ◽

Secondary Bile Acid ◽

Pathogen Inhibition

Seedling blight, caused by the fungus Fusarium oxysporum, significantly lowers rice production globally. Earlier reports have opined that endophytic bacteria strains could be possible biocontrol agents, but the mechanistic actions involved are still unclear. Therefore, this study aimed to isolate the endophytic bacteria with high inhibitory activity and elucidate its possible mechanisms for inducing resistance by metabolomics. The results showed that mdj-36 had the strongest in vitro pathogen inhibition of F. oxysporum, while mdj-34 displayed the lowest inhibitory activity identified as Bacillus velezensis strains. Metabolomic analyses demonstrated that B. velezensis mdj-36 growth medium could produce higher organic acids, terpenes, and diterpene than B. velezensis mdj-34. Further investigation revealed that ‘secondary bile acid biosynthesis’ and ‘glycerophospholipid metabolism’ pathways played essential roles in defense response towards F. oxysporum. This study’s findings provide a credible theoretical basis for the possible use of the B. velezensis strain against rice seedling blight.

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MEKANISME PARASITISME TRICHODERMA HARZIANUM TERHADAP FUSARIUM OXYSPORUM PADA SEMAI ACACIA MANGIUM

JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA ◽

10.23960/j.hptt.11572-80 ◽

2015 ◽

Vol 15 (1) ◽

pp. 72

Author(s):

Susanti Tasik ◽

Siti Muslimah Widyastuti ◽

Harjono .

Keyword(s):

Fusarium Oxysporum ◽

Trichoderma Harzianum ◽

Acacia Mangium ◽

Culture Method ◽

Inhibition Mechanism ◽

Dual Culture ◽

In Planta ◽

Know How ◽

Soil Borne Fungi

Mechanism of parasitism of Trichoderma harzianum on Fusarium oxysporum on Acacia mangium seedlings. Fusarium oxysporum is one of the most important soil-borne fungi the causal agent of damping-off disease. Detailed information it needed to know how the pathogen can be inhibited by Trichoderma harzianum. The objective of this research was to investigate the inhibition mechanism of T. harzianum on F. oxysporum in vitro and in planta. Green Flourescent Protein (GFP) T. harzianum was used as biocontrol agent of F. oxysporum. An in vitro inhibition test of T. harzianum was performed using dual culture method. In the in planta inhibition tests, seedlings of A. mangium were applied with GFP T. harzianum two days before inoculation of F. oxysporum; GFP T. harzianum was simultaneously applied with F. oxysporum and GFP T. harzianum was applied two days after inoculation of F. oxysporum. The inhibition effect of T. harzianum GFP was observed at seven days incubation, indicated by attachment of T. harzianum to F. oxysporum hyphae. GFP T. harzianum hyphae covered the colonies of F. oxysporum at 12 days after incubation. The highest life percentage of A. mangium seedlings was found on the treatment of GFP T. harzianum two days before inoculation of F. oxysporum (82.22%), whereas the lowest life percentage was found on seedling applied with GFP T. harzianum two days after inoculation of F. oxysporum (64.44%).

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Antagonisme Fungi Endofit Daun Jarak Pagar (Jatropha curcas) terhadap Fusarium oxysporum C2 Penyebab Busuk Umbi pada Bawang Merah in Vitro

Agrotechnology Research Journal ◽

10.20961/agrotechresj.v4i1.41351 ◽

2020 ◽

Vol 4 (1) ◽

pp. 47

Author(s):

Fauziyyah Nahdah ◽

Noorkomala Sari ◽

Akhmad Rizali ◽

Rabiatul Wahdah

Keyword(s):

Fusarium Oxysporum ◽

Jatropha Curcas ◽

Linear Trend ◽

Culture Method ◽

Fungal Endophyte ◽

Dual Culture ◽

Antimicrobial Substances ◽

Spss Software

Basal plate rot is a major disease on shallot caused by Fusarium oxysporum. Endophytic fungi is promising to use as antagonist agent to the pathogen. Endophyte is microbes that are living in plant cells and have an asymptomatic characteristic. Nowadays, fungal endophyte is believed to produce antimicrobial substances similar with their plant host's natural product. Jatropha curcas is one of the plants containing secondary metabolites that have antifungal activities. The research aimed to study the ability of endophyte from Jatropha curcas to inhibit the growth of Fusarium oxysporum. The dual culture method was used in this research and the data were analyzed by SPSS software. This antagonism test was conducted by 9 isolates endophyte and each plate consisted of 3 replicates. The result revealed endophyte fungal obtaining 9 isolates with the radial growth of 4,5 cm/2 days. Endophytes of Jatropha curcas L. were able to inhibit the growth of Fusarium oxysporum C2. The percentage of inhibition of Fusarium oxysporum causing of root blight diseases was controlled by up 38.27 - 74.48%. The highest percentage of inhibition is gained by B4b and the lowest of it is A2b. Our observations showed that each endophyte has a consistent linear trend. B4b still leaded as the highest strength to inhibit the growth of pathogen on the monitoring of 3, 5, and 7 days. Moreover, the ability of fungi endophyte from Jatropha curcas as antagonist agent to Fusarium oxysporum needs to be further examined by the in vivo method.

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Exploring the mechanism of the anti-hypertension properties of Morinda citrifolia through a bioinformatics approach

Kuwait Journal of Science ◽

10.48129/kjs.v48i3.9141 ◽

2021 ◽

Vol 48 (3) ◽

Author(s):

Dian Laila Purwaningroom ◽

◽

Sholihatul Maghfirah ◽

Muhaimin Rifai ◽

Widodo ◽

...

Keyword(s):

Blood Pressure ◽

Active Compound ◽

Ace Inhibitor ◽

Methanol Extract ◽

Bioinformatic Analysis ◽

Morinda Citrifolia ◽

Dependent Manner ◽

Active Compounds

Traditionally, noni (Morinda citrifolia L.) has been used to treat hypertension in tropical countries. The noni extract was proven to reduce blood pressure and relatively safe to the liver and kidney in the animal model. This extract could inhibit angiotensin-converting enzyme (ACE) and plays a pivotal role in controlling blood pressure. However, the active compound of the extract that has function as the ACE inhibitor is still unknown. Therefore, the objective of this study was to examine the mechanism of anti-hypertension of noni methanol extract as well as its active compound that acts as the ACE inhibitor by using a bioinformatics approach. An enzyme activity analysis showed that noni methanol extract inhibits ACE activity based on a dose-dependent manner. Further analysis using bioinformatic analysis suggested that three active compounds of Morinda citrifolia, namely linoleic acid, palmitate, and oleic acid, might be bound to PPARA and NOS3 protein. The two targeted protein is predicted as a regulator of blood pressure through the PPARA pathway. The findings showed that M. citrifolia has numerous active compounds containing multiple protein targets, which regulate blood pressure. However, in vitro and in vivo research should be conducted to provide evidence for the mechanism.

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KARAKTERISASI BAKTERI DARI PERAKARAN Nepenthes mirabilis UNTUK PENGENDALIAN HAYATI Fusarium oxysporum

Buletin Penelitian Tanaman Rempah dan Obat ◽

10.21082/bullittro.v31n1.2020.48-58 ◽

2020 ◽

Vol 31 (1) ◽

pp. 48

Author(s):

NFN Mardhiana ◽

Muh. Adiwena ◽

Ankardiansyah Pandu Pradana

Keyword(s):

Fusarium Oxysporum ◽

Plant Protection ◽

Physiological Activity ◽

Physiological Characteristic ◽

Dual Culture ◽

Antagonistic Bacteria ◽

Bacterial Isolates ◽

Chitinolytic Enzyme ◽

Physiological Tests

Phytopathogenic fungi Fusarium oxysporum causes significant yield losses in various spices plants. The fungus can be controlled with numerous types of antagonistic bacteria. This study aimed to determine the physiological characteristic and antagonistic properties of the bacterial from the roots of Nepenthes mirabilis, as a biological control to F. oxysforum. The study was conducted at the Plant Protection Laboratory, Faculty of Agriculture, the University of Borneo, Tarakan, from October to November 2017. Nutrient Agar medium was used to isolate antagonistic bacteria from the roots of N. mirabilis. Biosafety test against plants and mammals were conducted using hypersensitive and hemolysis analysis. The bacterial isolates passed from those tests were characterized further for their phenotype and physiological properties as well as their ability to inhibit the growth of F. oxysporum in a dual culture test in vitro. The results showed that there were 10 out of26 bacterial isolates originated from N. mirabilis roots that were safe for plants and mammals. Physiological tests showed that four isolates could produce the proteolytic enzyme, five isolates produced the chitinolytic enzyme, six isolates were able to dissolve phosphate, and four isolates could produce HCN. Furthermore, three isolates (Mrb2, Mrb6, and Mrb16) showed inhibitory activity against Fusarium spp. There were differences in the phenotype character and physiological activity between the Mrb2, Mrb6, and Mrb16 isolates, but all three have the potential to inhibit F. oxysporum.

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Plant growth-promoting activity in bean plants of endophytic bacteria isolated from Echeveria laui

Acta Brasiliensis ◽

10.22571/2526-4338496 ◽

2021 ◽

Vol 5 (2) ◽

pp. 65

Author(s):

Anderson Emmer ◽

João Arthur Dos Santos Oliveira ◽

Andressa Domingos Polli ◽

Julio Cesar Polonio ◽

Leonardo Hamamura Alves ◽

...

Keyword(s):

Plant Growth ◽

Endophytic Bacteria ◽

Arid Environment ◽

Bacterial Isolates ◽

Phaseolus Vulgaris L ◽

Bean Plants ◽

Plant Growth Promoting ◽

Plant Growth Promoting Activity ◽

Growth Promoting

Echeveria laui (Crassulaceae) is commonly commercialized due to its drought-tolerance capacity and to its rosette-shaped aesthetics. Since endophytes associated with plants from a dry or arid environment have scarcely been analyzed as yet, current research comprises the isolation of leaf endophytic bacteria from E. laui (one five-year-old and one two-year-old plants) investigating plant growth-promoting endophytic bacteria which may solubilize phosphate, fix nitrogen, produce exopolysaccharides/IAA and antagonize phytopathogens. Isolation by the maceration methodology provided a colonization rate of 1.98 x109 CFU g-1 for the two-year-old plant and 1.14 x 1010 CFU g-1 for the five-year-old one. All 40 isolates evaluated showed in vitro plant growth-promoting agent’s abilities, with emphasis on EG04, ELG18, and ELP06. The capacity of the three best bacterial isolates were evaluated under greenhouse conditions in common and black bean (Phaseolus vulgaris L.) plants. Based on the sequencing of the 16S rRNA region and phylogenetic analysis, the three endophytes were identified as Pantoea sp. (ELG04 and ELG18) and Erwinia sp. (ELP06). Under greenhouse conditions, statistically significant differences were found among the plants treated with the three endophytes when compared to control plants for fresh and dry shoot, root biomass and length.

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Antagonistic Activity and Characterization of Indigenous Soil Isolates of Bacteria and Fungi Against Onion Wilt Incited by Fusarium sp

10.21203/rs.3.rs-250917/v1 ◽

2021 ◽

Author(s):

Hilda Karim ◽

Andi Asmawati ◽

Oslan Jumadi

Keyword(s):

Fusarium Oxysporum ◽

Evolutionary Relationship ◽

Antagonistic Activity ◽

Dual Culture ◽

Bacterial Isolates ◽

Gene Markers ◽

Culture Techniques ◽

Fungal Isolates ◽

Bacteria And Fungi

Abstract Tuber rot disease due to phytopathogen Fusarium oxysporum f. sp. cepae (Foc) infection is one of the main factors causing the decreasing amount of global shallot production. This study aims to find bacteria and fungi candidates which have Foc antagonistic activity through in vitro tests using dual culture techniques. A total of five bacterial isolates and three fungal isolates isolated from the rhizosphere of healthy onion plants showed the ability to inhibit Foc growth. B1 and B4 bacterial isolates had an average inhibitory capability of 65.93% and 72.27% respectively. Whereas C1 and C2 fungal isolates have the ability to inhibit the growth of Foc by as much as 74.82% and 67.76% respectively. The four tested microbial isolates were able to significantly inhibit Foc activity in vitro based on the ANOVA test, with values α = 0.05, and n = 3. Molecular analysis based on 16S-rRNA markers showed bacterial isolates B1 and B4 have an evolutionary relationship with B. subtilis. Whereas fungi C1 and C2 have evolutionary relationships with Aspergillus tubingensis and Trichoderma asperellum respectively, based on internal transcribed spacer (ITS) gene markers. The results of this study can be used to develop indigenous microbial consortiums as biological control agents for phytopathogenic fungi Fusarium oxysporum f. sp. cepae (Foc) on shallots.

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Bioprospecting of endophytic bacteria (Bacillus spp.) from passionfruit (Passiflora edulis Sims f. flavicarpa) for plant growth promotion

Australian Journal of Crop Science ◽

10.21475/ajcs.19.13.08.p1837 ◽

2019 ◽

pp. 1369-1374

Author(s):

Clayton dos Santos Silva ◽

Jockeliny Mayara Camara dos Santos ◽

João Manoel da Silva ◽

Felipe Alexandre Tenório ◽

Erica Livea Ferreira Guedes Celestino ◽

...

Keyword(s):

Plant Growth ◽

Liquid Medium ◽

Endophytic Bacteria ◽

Phosphate Solubilization ◽

Bacterial Isolates ◽

Growth Promoters ◽

Passiflora Edulis ◽

Plant Growth Promoters ◽

Passiflora Edulis Sims

Endophytic bacteria has been reported as plant growth promoters in various cultivated and uncultivated plants. Thus, the objective onf this study was to evaluate the potential of 21 endophytic bacterial isolated from leaves of passionfruit plants (Passiflora edulis Sims f. flavicarpa). In vitro antagonism, indole-3-acetic acid (IAA) production, gibberellins, cytokines and phosphate solubilization were also tested. In vitro antagonism was investigated using volatile metabolites detection by means of the overlapping dishes technique and direct confrontation. The production of IAA was evaluated by means of the colorimetric method with the absorbance reading of the optical density at O.D. (550nm). The phosphate solubilization was measured in a qualitative method by reading the solubilization halo diameter and the quantitative evaluation in liquid medium and reading of O.D. (450 nm). All bacterial isolates were able to inhibit the growth of Phytophthora sp. in both methods with values ranging from 50% to >90% inhibition (Skott-Knott, p ≤0 0.05). All the tested endophytic bacteria were also able to produce plant hormones. The phosphate solubilization was more than mean of the liquid medium. Thus, the studied endophytic bacterial isolates are suggested as potential plant growth promoters.

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Characterization and activity of endophytic bacteria from ‘Prata Anã’ banana crop (Musa sp., AAB)

Revista CERES ◽

10.1590/0034-737x201865050001 ◽

2018 ◽

Vol 65 (5) ◽

pp. 381-387

Author(s):

Débora Francine Gomes Silva Pereira ◽

Silvia Nietsche ◽

Adelica Aparecida Xavier ◽

Suzane Ariádina de Souza ◽

Márcia Regina Costa ◽

...

Keyword(s):

Endophytic Bacteria ◽

Nitrogenase Activity ◽

Nifh Gene ◽

Bacterial Isolates ◽

Nitrogen Transformations ◽

Biochemical Tests ◽

Nirs Gene ◽

Banana Tree ◽

Musa Sp

ABSTRACT The objective of this study was to characterize banana tree endophytic bacteria at genus and species level and to determine the metabolic reactions associated with the nitrogen transformations. The identification at genus and species levels was performed using the partial sequencing of the rDNA 16S region. The assimbyotic nitrogen fixation, the reduction of nitrate and the production of urease were in vitro evaluated. The DNA of the bacterial isolates was also amplified to verify the presence of the nifH, nirK and nirS regions. Biochemical tests were performed in a complete randomized design; the treatments consisted of 39 bacterial isolates with three replications. Sequence analysis enabled the identification of four genera: Bacillus, Rhizobium, Klebsiella and Enterobacter. The Bacillus genus occurred more frequently, nine species were identified. By evaluating the results of biochemical tests, it was observed that three isolates showed multiple abilities: growth in NFb medium, nitrate reduction and production of urease. The isolates belong to the genus Bacillus and of the species subtilis, thuringienses and amyloliquefaciens. Approximately 12.5% of the isolates amplified the region corresponding to the nifH gene, 7.5% amplified gene nirK and 3.9% amplified the nirS gene. Endophytic bacteria evaluated in the present study showed in vitro activity for urease, nitrate reductase enzymes, however, relevant nitrogenase activity was not observed.

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