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"Penyakit Panama pada tanaman pisang disebabkan oleh kapang patogen Fusarium oxysporum f. sp. cubense. Telah dilakukan penelitian untuk karakterisasi penghambatan Aktinomisetes terhadap Fusarium oxysporum f. sp. cubense secara in vitro menggunakan sel hidup dan filtrat kultur bebas sel. Isolat Aktinomisetes LAI-I dan L31 diketahui menghasilkan enzim kitinase, protease, dan antibiotik yang dapat menghambat pertumbuhan, menyebabkan perubahan morfologi hifa berupa penebalan pada ujung-ujung hifa, serta menghambat germinasi spora Fusarium oxysporum f. sp. cubense. Perhitungan statistik menunjukkan adanya perbedaan yang nyata antara kelompok kontrol, perlakuan LAI-I, dan perlakuan L31. Hasil tersebut memperlihatkan adanya kemampuan isolat LAI-I dan L31 menghambat Fusarium oxysporum f. sp. cubense.

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The Panama disease in banana plants is caused by the pathogenic fungi Fusarium oxysporum f. sp. cubense. Research has been conducted to characterize the inhibition mechanism of Actinomycetes towards Fusarium oxysporum f. sp. cubense in vitro by using living cell and cell-free culture filtrate. Actinomycetes isolates LAI-I and L31 produce chitinase enzyme, protease enzyme, and secondary metabolites that can inhibit the growth, lead morphological changes of hyphae as swollen at the end of the hypha, and inhibit spore germination of Fusarium oxysporum f. sp. cubense. The statistic reveals the significant differences between control, LAI-I treatment, and L31 treatment. The result shows the ability of isolate LAI-I and L31 to inhibit Fusarium oxysporum f. sp. cubense."

"Bacillus sp. 140-B dan Streptomyces sp. L.3.1-DW diisolasi dari tanah dan rizosfer tanaman dari perkebunan nanas dan pisang di Provinsi Lampung. Kedua bakteri tersebut diuji kemampuannya dalam melawan patogen Fusarium oxysporum Schlecht f. sp. cubense (Foc) secara in-vitro dan in-vivo. Aplikasi Bacillus sp. 140-B dan Streptomyces sp. L.3.1-DW sebagai isolat tunggal maupun kombinasinya secara in-vivo pada tanaman pisang var. Cavendish dilakukan dalam rumah kaca selama 30 hari. Tujuan dari penelitian ini adalah untuk mengkarakterisasi dan menguji potensi Bacillus sp. 140-B dan Streptomyces sp. L.3.1-DW sebagai agen biokontrol dalam menghambat patogen Foc dan mengkaji kemampuannya untuk menghasilkan enzim ketahanan tanaman pisang. Potensi Bacillus sp. 140-B dan Streptomyces sp. L.3.1-DW sebagai agen biokontrol ditunjukkan dengan kemampuannya dalam menghambat pertumbuhan patogen Foc, sintesis enzim protease dan kitinase ekstraseluler, produksi hormon tumbuh Indole-Acetic Acid (IAA), dan produksi enzim ketahanan tanaman phenylalanine ammonia-lyase (PAL) and tyrosine ammonia lyase (TAL). Bacillus sp. 140-B dan Streptomyces sp. L.3.1-DW juga berperan sebagai plant growth-promoting rhizobacteia (PGPR), yang diindikasikan dengan peningkatan pertumbuhan tanaman pisang, di mana perlakuan Streptomyces L.3.1-DW memiliki rata-rata tinggi tanaman tertinggi dibandingkan perlakuan lainnya, dengan atau tanpa infeksi Foc. Hasil penelitian secara in-vitro dan in-vivo menunjukkan bahwa Streptomyces sp. L.3.1-DW memiliki kemampuan sebagai agen biokontrol yang lebih baik dibandingkan Bacillus sp. 140-B. Penelitian ini mengindikasikan bahwa Bacillus sp. 140-B dan Streptomyces sp. L.3.1-DW dapat digunakan sebagai alternatif untuk mengendalikan infeksi Foc.

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Bacillus sp. 140-B and Streptomyces sp. L.3.1-DW were isolated from soil and rhizosphere area of pineapple and banana plantation in Lampung Province. Those bacteria were evaluated in-vitro and in-vivo tests againts Fusarium oxysporum Schlecht f. sp. cubense (Foc). Application of Bacillus sp. 140-B and Streptomyces sp. L.3.1-DW as single isolate or in combination in banana plant var. Cavendish were tested under greenhouse conditions for 30 days.

The aims of this study were to characterize and investigate the potentials of Bacillus sp. 140-B and Streptomyces sp. L.3.1-DW as biocontrol agents to inhibit Foc pathogen and investigate their abilities to produce plant resistancy enzymes. The potentials of Bacillus sp. 140-B and Streptomyces sp. L.3.1-DW as biocontrol agents were showed by their abilities to inhibit growth of Foc pathogen, synthesize extracellular protease and chitinase enzymes, produce growth hormone, such as Indole-Acetic Acid (IAA), and produce plant resistancy enzymes, such as phenylalanine ammonia-lyase (PAL) and tyrosine ammonia lyase (TAL). Bacillus sp. 140-B and Streptomyces sp. L.3.1-DW also act as plant growth-promoting rhizobacteia (PGPR), that indicated by improvement of banana growth, in which Streptomyces L.3.1-DW caused the highest growth of banana either with or without Foc infection.

In-vitro and in-vivo tests was showed that Streptomyces sp. L.3.1-DW had better biocontrol activities compared to Bacillus sp. 140-B. This study indicated that Bacillus sp. 140-B and Streptomyces sp. L.3.1-DW could be used as alternative solutions to control Foc pathogen."

"ABSTRAKKapang rizosfer mempunyai kemampuan menghambatFusarium oxysporum f.sp. lycopersici (Sacc.) W.C. Snyder & H.N. Hans.penyebab penyakit layu pada tanaman tomat (Lycopersicon esculetum Mill.).Kapang rizosfer diisolasi dari daerah perakaran tanaman tomat di lahankonvensional Desa Cikahuripan dan Sukamulya, Sukabumi. Tujuh belas spesiesyang antagonis terhadap F. oxysporum f.sp. lycopersici telah diidentifikasi dari 47isolat yang diisolasi dan 2 isolat koleksi LIPI MC. Mekanisme antagonis untukmengendalikan patogen terlihat beragam dari tiap spesies kapang rizosfer.Kompetisi dengan kapang patogen terlihat pada Trichoderma sp. dan Mucor sp.Semua isolat kapang rizosfer memproduksi agen antifungi volatil bukan HCN dantidak dapat memproduksi enzim kitinase. Kapang rizosfer memproduksi agenantifungi non-volatil iturin yaitu Aspergillus fumigatus Fres., Aspergillus nigerVan Tieghem, dan 2 isolat Aspergillus sp. Enzim protease diproduksi olehA. fumigatus, Aspergillus sp., Fusarium oxysporum Schlecht, danHumicola fuscoatra Traaen. Aspergillus niger dan Penicillium sp., merupakankapang rizosfer yang memproduksi agen antifungi non-volatil dan volatil terhadappatogen. Baik pada suspensi konidia patogen yang disimpan 4° C dan tidakdisimpan dalam lemari pendingin yang diberi agen antifungi non-volatilAspergillus niger (1:1) memperlihatkan persentase hambatan pertumbuhankonidia patogen tertinggi masing-masing 77,97 % dan 76,08 % pada pengamatanjam ke-8. Agen antifungi non-volatil Aspergillus niger pada berbagai konsentrasimeningkatkan perkecambahan tomat masing-masing 4,17 % pada benih tomatyang diberi filtrat atau suspensi konidia patogen yang diinkubasi selama 30 menit.Sedangkan waktu inkubasi 60 menit, agen antifungi non-volatil A. niger padaberbagai konsentrasi meningkatkan perkecambahan tomat 5,25 %?21,04 % padabenih tomat yang diberi suspensi konidia patogen dan menurunkanperkecambahan tomat 6,38 %?13,04 % pada benih tomat yang diberi filtratpatogen. Perpanjangan waktu inkubasi 30 menit menghambat selama 4 harikolonisasi patogen pada tomat yang diberi campuran filtrat atau suspensi konidiapatogen dan agen antifungi non-volatil A. niger pada berbagai konsentrasi. Agenantifungi volatil dari Penicillium sp. dapat menghambat perkecambahan konidiapatogen sebesar 22,07 %.

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AbstractRhizosphere moulds have activities to reduce the growth of Fusariumoxysporum f.sp. lycopersici (Sacc.) W.C. Snyder & H.N. Hans, the causalpathogen of wilt disease of tomato (Lycopersicon esculentum Mill.) plant.Moulds were isolated from rhizosphere of tomato plants growing in the Villagesof Cikahuripan and Sukamulya, Sukabumi. Seventeen species that haveantagonistic effect to F. oxysporum f.sp. lycopersici were identified from 47isolates isolated from rhizosphere of tomato plant and 2 isolates of LIPI MCcollection. Antagonistic mechanism for control the pathogen seemed differentfrom each species of the rhizosphere moulds. Competition with the pathogen wasproduced by Trichoderma sp. and Mucor sp. All isolates of the rhizospheremoulds produced non-HCN volatile antifungal agent and did not producedchitinase enzyme. Rhizosphere moulds that produced iturin non-volatileantifungal agent were Aspergillus fumigatus Fres., Aspergillus niger VanTieghem, and 2 isolates of Aspergillus sp. Protease enzyme was produced byA. fumigatus, Aspergillus sp., Fusarium oxysporum Schlecht, andHumicola fuscoatra Traaen. Aspergillus niger and Penicillium sp. wererhizophere moulds that produced non-volatile and volatile antifungal agentsrespectively against the pathogen. Both on the suspension of the pathogen conidiastored in 4° C and unstored in refregerator that given non-volatile antifungal agentof A. niger (1 : 1) showed the highest percent inhibition of the pathogen conidiarespectively 77.97 % and 76.08 % in observation to-8 hours. Non-volatileantifungal agent of A. niger at various consentrations increased the germination oftomato respectively at 4.17 % on tomato that given the filtrate or suspension ofconidia of the patogen at 30 minutes incubation. While in the incubation time of60 minutes, non-volatile antifungal agent of A. niger at various concentrationincreased the germination of tomato at 5.25 %─21.04 % on tomato that givensuspension of conidia of the pathogen and decreased the germination of tomato at6.38 %─13.04 % on tomato that given the pathogen filtrate. Extending ofincubation time for 30 minutes 4 days delayed the colonization of the pathogen ontomato that given a mixture of the filtrate or the suspension of the pathogenconidia and non-volatil antifungal agent of A. niger at various concentrations.The volatile antifungal agent of Penicillium sp. decreased the germination ofconidia of the patogen at 22.07 %."

"Kendala yang sering dihadapi pada pertanian adalah hama tanaman yang dapat mengganggu produktivitas tanaman pangan. Pemberantasan hama sering menggunakan pestisida kimiawi yang dapat berdampak buruk pada lingkungan dan tanaman. Salah satu alternatif mengatasi permasalahan tersebut adalah dengan menggunakan mikroorganisme sebagai biokontrol bagi hama tanaman. Mikroorganisme diketahui berpotensi sebagai agen biokontrol, dan aktivitas tersebut dapat diuji dengan  Antibiosis. Aktivitas antibiosis terlihat sebagai kemampuan menghambat pertumbuhan suatu mikroorganisme terhadap mikroorganisme lain. Pada penelitian ini dilakukan uji antibiosis dan aktivitas enzim dari empat isolat basil Gram negatif yaitu TTM, TTO, TKL, TTH, terhadap fungi Fusarium oxysporum dan Ganoderma boninense. Keempat isolat bakteri difermentasikan dalam medium Nutrient broth (NB) selama 6, 9, dan 12 hari, pada suhu inkubasi 39oC. Uji antibiosis dilakukan secara kualitatif dengan menggunakan cylinder diffusion method. Hasil uji antibiosis menunjukkan bahwa hanya isolat TTH dan TTM yang memiliki potensi untuk menghambat fungi Ganoderma boninense  dalam fermentasi hari ke 6,9, dan 12. Hasil uji aktivitas enzim menunjukkan bahwa hanya isolat TTO yang memiliki aktivitas kitinolitik.

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One of the common challenges in agriculture is the presence of plant pests that can disrupt the productivity of food crops. Pest control often relies on the use of chemical pesticides, which can have negative impacts on the environment and plants. One alternative to address this issue is the utilization of microorganisms as biocontrol agents for plant pests. Microorganisms are known to have the potential as biocontrol agents, and this activity can be tested through antibiosis. Antibiosis activity is observed as the ability to inhibit the growth of one microorganism by another. In this study, antibiosis and enzyme activity tests were conducted on four isolates of Gram-negative bacteria, namely TTM, TTO, TKL, and TTH, against the fungi Fusarium oxysporum and Ganoderma boninense. The four bacterial isolates were fermented in Nutrient Broth (NB) medium for 6, 9, and 12 days at an incubation temperature of 39°C. The antibiosis test was qualitatively performed using the cylinder diffusion method. The results of the antibiosis test showed that only the TTH and TTM isolates had the potential to inhibit the Ganoderma boninense fungi during the 6th, 9th, and 12th days of fermentation. The enzyme activity test results indicated that only the TTO isolate exhibited chitinolytic activity."

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Bacillus spp. berpotensi sebagai agen biokontrol untuk meminimalisir kontaminasi mikroorganisme. Tujuan dari penelitian ini adalah untuk mengetahui aktivitas antagonistis sel dan filtrat Bacillus siamensis LDR terhadap beberapa spesies kapang. Purifikasi dan karakterisasi morfologi dilakukan pada medium PDA. Uji aktivitas antagonistis dilakukan dengan metode dual kultur dan uji antibiosis dilakukan dengan menggunakan filtrat fermentasi B. siamensis LDR yang diperoleh dari panen hari ke-12 dan ke-14. Persentase inhibisi ditentukan berdasarkan perhitungan pertumbuhan radial dan biomassa kapang yang diberi perlakuan, dibandingkan dengan kontrol. Hasil uji antagonistis menunjukkan bahwa Fusarium oxysporum, Aspergillus flavus AHM, dan Aspergillus clavatus ABH berhasil dihambat sebesar 35,92%, 42.75%, 27.18% pada teknik dual disc dan sebesar 92.94%, 87.15%, 85.45% pada teknik pour plate disc. Hasil uji antibiosis menunjukkan inhibisi F. oxysporum, A. flavus AHM, dan A. clavatus ABH lebih tinggi pada filtrat 14 hari, yaitu 41.84—41,94%, 34,83—36,04%, 63.27—63,81% pada medium PDA dan 53,15—76,37%, -151— -11.01, 88.87—90.36% pada medium PDB. Sel dan filtrat B. siamensis LDR memiliki aktivitas antagonistis terhadap Fusarium oxysporum, Aspergillus flavus AHM, dan Aspergillus clavatus ABH dengan ketidakstabilan aktivitas antibiosis terhadap A. flavus AHM, secara in vitro.

 

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Bacillus spp. are potential biocontrol agent to reduce crop contamination by microorganism. Aim of this research is to screen antagonistic activity of B. siamensis LDR cells and filtrate against few species of filamentous fungi. Purification and morphological characterization were done on PDA. Screening of antagonistic activity was done by antagonistic assay using dual culture method and antibiosis assay using 12 and 14 days fermentation filtrate of B. siamensis LDR. Percentage of inhibition were determined by comparing radial growth and biomass of treated fungi to untreated fungi as control. Result of antagonistic assay showed Fusarium oxysporum, Aspergillus flavus AHM, and Aspergillus clavatus ABH were inhibited for 35,92%, 42.75%, 27.18% by using dual disc technique and 92.94%, 87.15%, 85.45% by using pour plate disc technique, respectively. Result of antibiosis assay showed the highest inhibition activity against F. oxysporum, A. flavus AHM, A. clavatus ABH was found in 14 days fermentation filtrate, which were 41.84—41,94%, 34,83—36,04%, 63.27—63,81% on PDA and 53,15—76,37%, -151— -11.01, 88.87—90.36% on PDB, respectively. Therefore, B. siamensis LDR cell and filtrate has antagonistic activity against Fusarium oxysporum, Aspergillus flavus AHM and Aspergillus clavatus ABH, despite of unstable antibiosis activity against A. flavus AHM, in vitro.

 

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"pisang raja bulu is one of the most important bananas in Indonesia. However,, this plant low tolerance to wilt disease, caused by fusarium oxysporum f. cubense. Its mass cultivation is inhibited by the absence of variety tolerant to the disease. A wide range of genetic variability will be needed if selection for novel characters is to be conducted, especially when there is no source of resistance gene available for breeding materials. This research consisted of callus induction from primary explant, induction of somaclonal variation using gamma iradiation, and in vitro selection using fusaric acid, followed by regeneration and acclimatization of selected plantlets. The media applied for callus induction was MS (Murashige and skoog. 1962) +2,4-D 1 and 3 mg/l + NAA 0 and 0,1 mg/l and 2,4-D 5 mg/l + BA 0,5 mg/l + casein hidrolysate (CH) 500 mg/l. The applied gamma irradiation dosage were 0, and 0,1 mg/l and 2,4-D 5 mg/l + BA 0,5 mg/l + casein hidrolysate (CH) 500 mg/l. The applied gamma irradiation dosage were 0, 5.0, 7.5, 10 and 15 Gy. The irradiated cali was subsequently subcultures on selection media i.e., MS containing fusaric acid at 30 and 45 mg/l. The living calli was then regenerated on media containing BA, TDZ, eith or without proline and arginine. In addition, MS + kinetin 5 mg/l + 1AA 0,2 mg/l was applied for shoot development. The result showed that the most suitable callus induction media for pisang raja bulu was MS +2,4-D 5 mg/l +BA 0,5 mg/l +CH 500 mg/l. The gamma irradiation of 10 Gy produced somaclone lines which were able to proliferate bud nodules on selection media containing fusaric acid at 30 and 45 mg/l. The media for shoot development was MS + kinetin 5 mg/l + 1AA 0,2 mg/l. Plantlet obtained form the in vitro were then successfully acclimatized in the green house."

"Early Childhood Caries (ECC) adalah kondisi terdapat satu atau lebih kerusakan gigi, baik lesi dengan kavitas atau tanpa kavitas, kehilangan gigi akibat karies, atau penambalan permukaan gigi sulung pada usia antara usia lahir hingga 72 bulan. Streptococcus mutans merupakan mikroorganisme yang paling dominan pada terjadinya karies dan banyak terdapat dalam plak gigi.² Streptococcus mutans adalah bakteri anaerob fakultatif gram positif yang ada pada rongga mulut manusia. Secara struktur serotype - specific polysaccharides, Streptococcus mutans diklasifikasikan Streptococcus mutans diklasifikasikan ke dalam empat serotipe c, e, f, dan k. Prevalensi masing-masing serotipe  berdasarkan penelitian yang dilakukan di Jakarta didominasi oleh serotipe f (85.5%), c (74.2%), dan e (22.6%). Ekstrak bawang putih atau yang dikenal dengan Allium sativum diketahui telah memiliki kemampuan menghambat aktivitas pada berbagai jenis bakteri patogen. Efek dari Allicin yang terkandung dalam bawang mampu menurunkan aktivitas bakteri dengan menghambat proses pembentukan biofilm. Aktivitas antibakteri dari empat konsentrasi Allium Sativum (10%, 25%, 50%, dan 100%) diteliti terhadap pembentukan biofilm Streptococcus mutans serotype c dan f menggunakan metode MTT Assay. Kontrol positif dengan chlorhexidine gluconate 0,2% dan kontrol negatif. Data dianalisis dengan uji Kruskall wallis dan uji post-hoc Mann Whitney. Keempat konsentrasi mampu menurunkan viabilitas Streptococcus mutans serotipe c dan f.  Streptococcus mutans serotipe c memiliki konsentrasi yang signifikan pada 50% & 100%, sedangkan Streptococcus mutans serotipe f signifikan pada konsentrasi 100%.

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Early Childhood Caries (ECC) is a condition of one or more tooth decay, either lesions with cavity or no cavity, caries-induced tooth loss, or patching of the surface of deciduous teeth between the ages of birth and 72 months. Streptococcus mutans is the most dominant microorganism on caries occurrence and is present in dental plaque. Streptococcus mutans is a gram-positive facultative anaerobic bacteria present in the human oral cavity. Structurally serotype - specific polysaccharides, Streptococcus mutans classified Streptococcus mutans are classified into four serotypes c, e, f, and k. The prevalence of each serotype based on research conducted in Jakarta is dominated by serotype f (85.5%), c (74.2%), and e (22.6%). Garlic extract or known as Allium sativum is known to have the ability to inhibit activity in various types of pathogenic bacteria. The effects of allicin contained in the garlic can decrease bacterial activity by inhibiting the biofilm formation process. The antibacterial activity of four Allium Sativum concentrations (10%, 25%, 50%, and 100%) was investigated on the formation of Streptococcus mutans serotype c and f using the MTT Assay method. Positive control with chlorhexidine gluconate 0.2% and negative control. Data were analyzed by Kruskall wallis test and post-hoc Mann Whitney test. The four concentrations were able to decrease the viability of Streptococcus mutans serotype c and f. Streptococcus mutans serotype c has a significant concentration at 50% & 100%, while Streptococcus mutans serotype f is significant at 100% concentration."