Tri Joko

• PhD
• Associate Professor at Universitas Gadjah Mada

Praktik budidaya yang intensif pada tumpang gilir antara cabai rawit–jagung perlu dilakukan evaluasi untuk mengetahui keunggulan lahan dan kompetisi di antara dua spesies yang berbeda. Tujuan penelitian ini untuk mengetahui nilai kompetisi dan keunggulan lahan dari model tanam tumpang gilir cabai rawit–jagung dan aplikasi agens hayati. Penelitian d...

Twisted disease is one of the problems in shallot cultivation. The application of the biological agents Bacillus velezensis and Arbuscular Mycorrhizal Fungi is an alternative expected to overcome disease problems in shallot plantings. The purpose of this study was to determine the effect of the application of B. velezensis and Arbuscular Mycorrhiza...

Biofilms are major virulence factors formed by pathogenic bacteria to invade their host and maintain their colony. While biofilms usually develop on diverse solid surfaces, floating biofilms, also called pellicles, are formed at the air–liquid interface. To address the problem of biofilm formation by bacterial pathogens, honey has been extensively...

Diaphorina citri, an important pest and insect vector that can transmit the pathogenic bacteria Candidatus Liberibacter asiaticus, causing Huanglongbing disease, is one of many challenges in citrus agriculture. Integrated pest management by utilizing microorganisms is a wise and efficient alternative without damaging the environment. Utilization of...

Leatherleaf fern ( Rumohra adiantiformis ) is a famous ornamental-leaf plant that has been used by florist entrepreneurs around the world. It is one of the leading export commodities in Indonesia, however, currently, there are some diseases of this leaf reported in the field causing yield loss and reducing the economic value. This study aimed to id...

The phloem-limited bacterium, 'Candidatus Liberibacter asiaticus' (CLas), is the putative causal pathogen of the severe Asiatic form of huanglongbing (citrus greening) and is most commonly transmitted by the Asiatic citrus psyllid (ACP), Diaphorina citri. CLas severely affects many Citrus species and hybrids and has been recorded in the Citrus rela...

Leatherleaf fern ( Rumohra adiantiformis ) is an important ornamental plant in Indonesia and global. Green fern leaves with bold dark green color with long shelf-life, attract florists as decoration. Indonesia is one important leatherleaf fern exporters, however currently an outbreak of leaf blight decreased production significantly. Initial sympto...

Chotimah, Soffan A, Joko T. 2024. Diversity of universal stress protein in Enterobacteriales and its reduced expressions on Pectobacterium brasiliense after manuka honey treatment. Biodiversitas 25: 49-52. Universal stress proteins (Usps) support the survival of an organism by increasing their expressions under stress conditions, which include nutr...

Shallots are a type of plant used as a flavoring agent and are often affected by twisted disease caused by Fusarium spp. This study aims to determine the ability of organic material enriched by Trichoderma asperellum in controlling twisted disease, increasing production, and suppressing the population of Fusarium spp. in the soil. The research show...

The use of several shallot varieties applied with the biological agent Bacillus spp. is one of the most developed methods of controlling twisted disease, as it is safe and efficient. The large number of shallot varieties released to farmers requires the selection of varieties with the best resistance response to twisted disease. This study aimed to...

The purpose of this study is to find out the type of antagonistic rhizobacteria and their capability in F. acutatum growth suppression on in vitro and in vivo condition. The study was conducted by selecting of rhizobacteria isolated from Shallot’s rhizosphere which was taken from 4 regions; they were Bantul district (Yogyakarta), Nganjuk (East Java...

Shallot (Allium cepa var. aggregatum.) is a horticultural plant that is widely consumed in the world. However, the productivity of shallots in Indonesia is still relatively low, if compared to the actual optimum production potential of shallot. Shallot cultivation in Indonesia often experiences many problems. One of the problems is twisted diseases...

Various regulatory mechanisms control the initiation of transcription to regulate gene expression. Several families of transcription factors (TFs) regulate this biological process. The lactose repressor protein (LacI) family is the second-largest family of TFs in bacteria and archaea. Members of the LacI family have been reported to regulate gene t...

Artanti H, Joko T, Suryanti. 2023. Diversity and community structure of rhizosphere bacteria in shallot treated with Rhizophagus intraradices and Trichoderma asperellum. Biodiversitas 24: 6248-6255. The rhizosphere is an area rich in nutrients and has high microbial activity. The condition of the rhizosphere area can influence plant growth and resi...

Anthracnose caused by Colletotrichum gloeosporioides is a prevalent disease that poses a significant threat to shallot production in Indonesia. To mitigate this issue, the use of biological agents presents an alternative for disease control, reducing the inherent risks associated with the use of chemical pesticides. Therefore, this study aimed to d...

Twisted disease (Fusarium spp.) is an endemic disease that reduces shallot production in the coastal land area of Samas, Bantul, Yogyakarta. The application of Bacillus spp. can suppress the twisted disease by secreting secondary metabolites and enhancing soil suppressiveness. This study aimed to determine the effectiveness of adding spraying Bacil...

Cloves is one of the main plantation commodities and is native to Indonesia. Leaf spot disease with necrosis symptom is often found in clove plants. Interferences to photosynthesis caused by leaf spot disease can cause plant death. Bacillus is known to inhibit the development of pathogens through nutrient competition and antibiosis mechanism. This...

The significant decrease in clove production in Indonesia is mainly due to the Sumatra disease caused by bacterial Ralstonia syzygii subsp. syzygii. It is necessary to manage the disease broadly based on disease detection in the field and the laboratory. This study aims to determine the technique for detecting the distribution pattern of Sumatra di...

Bacterial wilt disease caused by Ralstonia pseudosolanacearum is a major problem in tomato cultivation. This research was aimed to evaluate the potential of grafting two susceptible tomato varieties (Servo and Kaliurang) with EG203-resistant eggplant, combined with bacteriophage treatment to suppress bacterial wilt disease. The results showed that...

The primary virulence of soft rot pectobacteria, including Pectobacterium brasiliense, is mainly determined by the massive production of plant cell wall-degrading enzymes (PCWDEs), which promote plant tissue maceration in many crops. The antibiotic treatment to treat bacterial soft rot causes environmental problems and potentially affects resistanc...

The demand for shallots has increased along with the Indonesian population. To achieve shallot production goals, farmers began to plant shallots outside usual planting season. However, unfavourable environmental conditions and pest attacks are obstacles faced by farmers. The use of Biological Control Agents (BCA) is a way to improve plant growth an...

Ralstonia solanacearum (Smith) is a soil-borne pathogen that causes bacterial wilt disease and is a complex species in races, biovars, phylotypes, and strains of various pathogenicities. As a result, the pathogen is difficult to control. An alternative control is by applying actinomycetes and bacteriophages on tomato grafted with resistant rootstoc...

Twisted disease caused by Fusarium spp. is one of the primary diseases on shallots with potency to cause enormous losses by causing stunting and bulb rot. One alternative disease control is the induction of plant resistance since the seed stage. The aim of this study was to determine the content of salicylic acid, jasmonic acid, and phenolic compou...

Plant Growth Promoting Rhizobacteria has been known for its ability to induce plant resistance on shallot against twisted disease. Its ability as a bioprotectant agent is estimated to be comparable to the efficacy of Trichoderma which is currently widely used as a biological control agent.. This study aims to determine the content of jasmonic acid,...

Tiyung cultivar, the consumer preferences of hot pepper in Magelang Regency, is still low in productivity (7 ton.ha-1). This research aimed to determine the growth and yield of hot pepper planted in relay intercropping as affected by biological agent application as a technology to increase productivity. This research was arranged in a Factorial Ran...

Background: Black pod rot disease of cocoa caused by (Phytophthora palmivora Butl.) is one of the major diseases on cocoa plantations worldwide. Many attempts have been made to prevent or reduce the infection of pathogens, but they have not provided optimum results. This study aims to detect antibiotic genes in endophytic bacteria that can suppress...

Ralstonia solanacearum (Smith) is one of soil borne pathogens causes bacterial wilt diseases and R. solanacearum is difficult to control because it has a long survival in the soil and have many hosts alternatives. One alternative to control R. solanacearum and to increase productivity is by using grating with combination of resistant varieties of t...

p>Snake fruit ( Salacca zalacca (Gaertner) Voss) is one of indigenous fruits from Southeast Asia that has been consumed for its antioxidant contents. Improving the fruit quality might increase its benefits for human health. This study aims to analyze fruit morphology, antioxidant activity, total phenolic and flavonoid contents of the fruit applied...

Background and Objectives: Many pathogens have been reported to cause serious problems to orchid crops. The use of resistant plant is considered as the most economical way and environmentally friendly in disease control. The aim of this study was to investigate and characterize Pto genes in several orchid species for potential disease management st...

One of the determining factors in disease control is the use of superior seeds which have good quality and quantity. The use of biological control agents that form a symbiotic mutualism in their host plants can be used as an effort to obtain quality clove seeds. Endophytic bacteria and rhizobacteria have been reported as potential biological contro...

Pituitary Positive Transcription Factor-1 gene is closely related to chicken growth and productivity. This research was conducted to detect Single Nucleotide Polymorphism in the exon 6 Pituitary Positive Transcription Factor-1 gene and its association with the bodyweight growth in the first backcross hybrid chicken. Procedures of the research inclu...

Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) has been reported to cause ± 20–50% of rice yield loss around the world. Resistant varieties are used to control this disease, however due to rapid evolution of this pathogen, the resistances was broken down in a few years. This study is aimed to determine the role of nanochi...

Prolactin (PRL) Gene in chicken was closely related to broodiness and brooding behavior that located at chromosome 2. This research was conducted to detect insertion/deletion (in/del) 24-bp polymorphism in the prolactin promoter gene and its association with the BC1 hybrid chicken egg productivity. Procedures of this research conducted are chicken...

Bacterial wilt disease caused by Ralstonia solanacearum is a devastating soil-borne vascular disease of tomato leading to a 100% yield loss. One of the alternatives to suppress the infestation of R. solanacearum infestation is the application of grafting techniques, which has been studied and successfully practiced by tomato growers. However, the i...

Purple blotch and fusarium basal rot are important shallot diseases which have caused significant yield loss. An alternative control method for these diseases is the use of biocontrol agents, such as arbuscular mycorrhizal fungi (AMF) and Trichoderma. The objectives of this study were to determine the effects of AMF and Trichoderma sp. on shallot g...

Widiastuti A, Karlina ML, Dhanti KR, Chinta YD, Joko T, Suryanti, Wibowo A. 2020. Morphological and molecular identification of Fusarium spp. isolated from maize kernels in Java and Lombok, Indonesia. Biodiversitas 21: 2741-2750. Fungal contamination of maize is a serious problem in Indonesia. Fusarium spp. infect maize in the field will be continu...

The increasing production of banana is hampered by the spread of banana plant diseases, one of which is caused by a group of bacteria, including those of causing wilt diseases. In Indonesia, blood disease is one of the important banana wilt diseases since loss due to the infection can reach up to 50%. There are numerous publications on the pathogen...

Background and Objective: The utilisation of biological control agents using microorganisms is considered as one of the safest and most affordable strategies. This study was conducted to investigate the antagonistic potential of endophytic bacteria against Phytophthora palmivora causing black pod rot disease on cocoa in Indonesia. Materials and Met...

Background and objectives: Shallot is a vegetable crop with high economic value, but its productivity is still relatively low due to various limitations. One of the most hampering factors is moler disease and purple blotch disease caused by Fusarium sp. and Alternaria porri, respectively. Numerous efforts have been made to control these diseases e...

The original article was published with a spelling error to contributor name Rofiatun Solekha.

Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is an important disease in rice plants worldwide, including in Indonesia. The use of resistant variety against BLB is the best effort in disease control because it is considered as the most effective and environmentally friendly. This study aimed to evaluate the resistance of...

In this study, we focus on the phenylalanine ammonia lyase (PAL) as one of the possible defense factors of black rice (a black colour mutation of Oryza sativa, containing a high amount of anthocyanin and other antioxidants) against Xanthomonas oryzae pv. oryzae (Xoo), causing bacterial leaf blight of rice. Two black rice varieties namely Pari Ireng...

Pectobacterium carotovorum subsp. brasiliense is one of the major causative bacterial pathogens of the soft rot disease in various crops. It has a high virulence and a wide range of hosts in the tropics and the subtropics. Most often, conventional methods are not able to accurately distinguish P. carotovorum subsp. brasiliense from other subspecies...

Phytoplasma is known to be associated with plant diseases in about 300 plant species from various families. Information on the presence of phytoplasma in bananas as one of the pathogens that can cause disease in bananas in Indonesia has never been reported. This research was conducted with the aim to detect the presence of banana phytoplasma by the...

A wilt clove disease has been reported recently that triggered a widespread devastation among clove plantings in Central Java, Indonesia. In the early stage, the younger leaves showed wilt suddenly, falling from the twig tip of branches in the crown, leaving the twig tip bare. However, older leaves may also turned brown and stay attached to the bra...

Huanglongbing is known as a destructive disease in citrus production. Investigation on plant response and development of huanglongbing disease against heat treatment on ‘Siam Purworejo’ (Citrus nobilis (Lour)) and ‘Nambangan’ (C. maxima (Burm.) Merr.) was done. High-temperature treatment was applied by covering plants with an enclosed screen. The t...

Growth and Development of Inoculated in Northern Black Wattle Seedling with Seed Borne Bacterial Pathogens Northern black wattle (Acacia auriculiformis) is a fast growing species that has multipurpose benefits such as pulpwood, solid wood, firewood, charcoal and pellet. Seed-borne bacterial pathogens were reported to reduce seed germination and se...

Ralstonia syzygii subsp. syzygii that belong to Ralstonia solanacearum species complex is the cause of Sumatra disease of clove. The disease was reported to cause widespread devastation on clove plantings in Indonesia. One of the control strategies is to reduce the spread of the disease through early detection on clove seedlings. The study aimed to...

Black rice production in Indonesia constrained by the bacterial blight disease (BLB) caused by Xanthomonas oryzae pv. oryzae pathotype IV (Xoo). Breeding of BLB resistant cultivars is considered the most sustainable method for BLB disease control, both from an environmental and agricultural perspective. Indonesia has many local black rice varieties...

ABSTRAK Akor (Acacia auriculiformis) merupakan tanaman legum yang banyak dimanfaatkan sebagai kayu pulp, kayu pertukangan, kayu bakar, arang, dan pelet. Patogen terbawa benih dapat mengurangi perkecambahan benih dan pertumbuhan bibit. Penelitian ini bertujuan mengevaluasi pengaruh bakteri patogen terbawa benih akor terhadap perkecambahan benih dan...

The presence of bacterial panicle blight disease caused by Burkholderia glumae have been reported to infect rice plants in Indonesia. There have been no reports of yield losses due to B. glumae infection, but this pathogen is seed-borne so that it can increase the spreading potential to other areas. This study aims to determine the spread of the di...

The intimate relationship between endophytic bacteria and their host may influence the physiological mechanisms of plants. In this study, a hundred and six bacterial endophytes were isolated from tissues of twelve orchid species, and screened according to in vitro antagonistic activity, indole-3-acetic acid (IAA) production, and phosphate solubiliz...

Pectate lyase (Pel) synthesis in Dickeya chrysanthemi has been reported to be hyperinduced in planta and also in the medium containing plant extract in addition to polygalacturonate. In this study, the major components of Pel-hyperinducing fractions were found to be glucose, fructose, and sucrose by TLC and NMR. From the analysis of the sugars and...

Huanglongbing (HLB) which is caused by Candidatus liberibacter asiaticus (CLas) is one of the citrus diseases that cause the largest losses on citrus orchards in Indonesia and other countries. An experiment was conducted at the HLB endemic area in Purworejo district of Central Java to study the response of biofertilizer treatment on HLB susceptible...

The new disease on garlic (Allium sativum) and shallot (A. cepa L. aggregatum group) have been found in several production centers of garlic and shallot in Tawangmangu and Temanggung, Central Java. The infected plants showed symptoms of leaf blight accompanied by chlorosis. The objective of this study was to determine the pathogen that causes leaf...

Background and Objective: Sumatera disease caused by Ralstonia syzygii subsp. syzygii is reported to generate severe damage to clove plantation in Indonesia. The chemical control of insect vector has partially been successful yet impacted on environmental problems. Endophytic and rhizobacteria have been reported as potential biocontrol agents for m...

ABSTRAK Penyakit blas yang disebabkan oleh Pyricularia oryzae merupakan salah satu penyakit penting pada tanaman padi yang dapat menimbulkan kerugian yang cukup besar. Di Indonesia, luas pertanaman padi yang terdampak penyakit blas dapat mencapai 1.285 juta ha atau sekitar 12% dari total luas areal pertanaman. Pengendalian penyakit blas yang umum d...

It is crucial to get healthy seed for supporting the success of plantation forest programme of northern black wattle (Acacia auriculiformis A. Cunn. Ex Benth). Seed-borne pathogens can reduce seed viability, vigour and storage capacity as well as cause seed deterioration rate faster so that it is important to find out proper storage techniques. The...

Huanglongbing (HLB) disease is the most serious threat to citrus production in Indonesia. Commonly, the planted rootstocks/scion varieties expressed severely damaged to HLB. This research aimed to study effects of six citrus rootstock/scion combination of varieties on intensity of HLB disease, presence of Candidatus Liberibacter asiaticus (CLas), a...

Detection of seed-borne pathogenic bacteria of northern black wattle (Acacia auriculiformis A. Cunn. ex Benth.). Intensive research of seed-borne pathogen of A. mangium and A. crassicarpa which have been established in industrial timber estate (HTI), while plantings development of northern black wattle in Indonesia 1990 have not recent been establi...

Natural orchids are one of the important ornamental plants that were cultivated in tropical countries, including Indonesia. Virus infections has been important limiting factor in orchids cultivation because it decreases the orchids quality. Odontoglossum ringspot virus (ORSV) is one of the most reported virus infecting orchids which spread widely i...

Potato (Solanum tuberosum) is a seasonal shrub-tuber crop originated from subtropical area. Soft-rot is one of the most important diseases of potato. It can be caused by Pectobactorium atrosepticum, a pathogen within a status of quarantine plant pest A1 type I in Indonesia. The objective of this study was to know the incidence of potato soft rot di...

Orchids are one of the important ornamental plants that were cultivated in tropical countries, including in Indonesia. Virus infections has been important limiting factor in orchids cultivation because it could decrease the orchids quality. Odontoglossum ringspot virus (ORSV) is one of the most reported viruses infecting orchids, which spread widel...

p>Orchids are one of the most important ornamental plants and cultivated in tropical countries, including in Indonesia. Virus infections become an important limiting factor in orchids cultivation because it causes significant losses of the plants. Odontoglossum ringspot virus (ORSV) is one of the most reported viruses infecting orchids and spread w...

Jagung merupakan komoditas pangan alternatif karena memiliki potensi untuk dikembangkan sebagai sumber karbohidrat dan bahan baku industri olahan. Salah satu kendala utama produksi jagung adalah serangan patogen yang dapat menurunkan kualitas dan produktivitas tanaman. Penggunaan Plant Growth Promoting Rhizobacteria (PGPR) telah lama dilaporkan mam...

Jagung merupakan komoditas pangan alternatif karena memiliki potensi untuk dikembangkan sebagai sumber karbohidrat dan bahan baku industri olahan. Salah satu kendala utama produksi jagung adalah serangan patogen yang dapat menurunkan kualitas dan produktivitas tanaman. Penggunaan Plant Growth Promoting Rhizobacteria (PGPR) telah lama dilaporkan mam...

Bacterial fruit blotch (BFB) caused by Acidovorax citrulli is a serious seedborne disease in Cucurbitaceae causing 90-100% yield losses. The aim of this study was to explore BFB symptom on melon and also to detect A. citrulli infection in commercial seed and symptomatic fruits from the field in Yogyakarta Special Region province and its surrounding...

Bacterial fruit blotch (BFB) caused by Acidovorax citrulli is a serious seedborne disease in Cucurbitaceae causing 90−100% yield losses. The aim of this study was to explore BFB symptom on melon and also to detect A. citrulli infection in commercial seed and symptomatic fruits from the field in Yogyakarta Special Region province and its surrounding...

Indonesia is major producer of black pepper (Piper nigrum L.), however the pepper production has been decreasing in the last decades. Black pepper yellowings caused by Fusarium solani and Meloidogyne incognita is one of the most important disease on pepper causing the decrease of pepper production. This research was aimed at the selection of potent...

Penyakit busuk lunak (PBL) yang disebabkan oleh bakteri patogen merupakan salah satu penyakit yang sangat merugikan pada tanaman anggrek. Kerugian akibat serangan patogen penyakit busuk lunak dapat mencapai 20– 50% dan sejauh ini merupakan faktor pembatas produksi anggrek di sentra-sentra pertanian anggrek. Oleh karena itu keberadaan penyakit busuk...

ABSTRAK Jagung merupakan komoditas pangan alternatif karena memiliki potensi untuk dikembangkan sebagai sumber karbohidrat dan bahan baku industri olahan. Salah satu kendala utama produksi jagung adalah serangan patogen yang dapat menurunkan kualitas dan produktivitas tanaman, sehingga perlu teknologi yang dapat meningkatkan kualitas tanaman jagung...

ABSTRAK Penyakit busuk lunak (PBL) yang disebabkan oleh bakteri patogen merupakan salah satu penyakit yang sangat merugikan pada tanaman anggrek. Kerugian akibat serangan patogen penyakit busuk lunak dapat mencapai 20–50% dan sejauh ini merupakan faktor pembatas produksi anggrek di sentra-sentra pertanian anggrek. Oleh karena itu keberadaan penyaki...

Jagung merupakan komoditas pangan alternatif karena memiliki potensi untuk dikembangkan sebagai sumber karbohidrat dan bahan baku industri olahan. Salah satu kendala utama produksi jagung adalah serangan patogen yang dapat menurunkan kualitas dan produktivitas tanaman, sehingga perlu penerapan teknologi yang dapat meningkatkan kualitas tanaman jagu...

Soft rot by bacterial pathogens is one of the most widespread and destructive diseases on various plants including orchids throughout the world. The pathogenicity of the pathogens is reported to be mainly determined by massive production of plant cell wall-degrading enzymes (PCDE). In the previous work, we have isolated 20 isolates of bacterial sof...

Coastal area around sand dune on the Bocor Beach potentially used as agricultural land especially melon cultivation. It was located at Buluspesantren Subdistric , Kebumen Distric, Central Java. Cultivation techniques in that land were not green cultivation .The use of pesticides, non-organic material, and plant cutting in the area of sand dune have...

We investigated the rhizobacterial densities and community structure in watermelon rhizosphere under infection of Cucumber Green Mottle Mosaic Virus (CGMMV) by artificial inoculation. Rhizobacterial densities and communities were analysed from healthy and infected plant under aerob and anaerob culture technique. The highest total number of aerobic...

Soft rot is one of the most important diseases of orchids caused by Pectobacterium carotovorum. The conventional methods for the detection of pathogen is tedious and time consuming. In recent years, numerous molecular diagnostic approaches for the detection of P. carotovorum have been developed, including various PCR-based assays. Optimization of P...

A soft rot disease was observed on Phalaenopsis sp., in major growing areas of Yogyakarta and West Java, Indonesia during April-July 2010. Typical symptoms were soft rots characterized by moist and watery decay of the one or whole leaves, which initiated as small water-soaked lesions and enlarged rapidly to the entire leaves. Among surveyed areas,...

Cucurbits grow throughout the Java island of Indonesia as dry season crops. However, the cucurbits cultivation has been faced with virus infections that reduce their production. Cucumber green mottle mosaic virus (CGMMV), which a member of the Genus Tobamovirus, has been reported infecting cucurbits in Indonesia. The most common symptoms of infecte...

Leatherleaf fern is an important export commodity of floriculture. One of the most destructive disease on leatherleaf fern is anthracnose. The aim of this study was to identify the causal agent of antracnose-like disease on leatherleaf fern, to detect the pathogen in soil, and to control the disease with fungicides. Diagnosis was done with modified...

A soft rot disease was observed on Phalaenopsis sp., in major growing areas of Yogyakarta and West Java, Indonesia during April-July 2010. Typical symptoms were soft rots characterized by moist and watery decay of the one or whole leaves, which initiated as small water-soaked lesions and enlarged rapidly to the entire leaves. Among surveyed areas,...

One of the obstacles that was encountered in the banana cultivation is blood disease. Blood diseases is caused by Ralstonia solanacearum that is subsequently revised to become blood disease bacteria (BDB). Until now the control of banana blood disease is very difficult. Control of banana blood disease with chemical injections and soil treatment is...

Ralstonia syzygii is one of important pathogens of cloves. This study was aimed at obtaining pure culture of R. syzygi from diseased plant tissue samples. The acterium was isolated from infected clove plantations in Ungaran, Central Java. It had the ability to make clove seedlings show symptoms and then die 41 days after inoculation. The reisolated...

Dickeya dadantii (syn. Erwinia chrysanthemi) is a causal agent of soft-rot diseases on many crops. Here, we characterized a gene belonging to the major facilitator superfamily (MFS), which is involved in the symport, antiport, or uniport of various substrates, and the survival and virulence of many Gram-negative bacterial animal pathogens, for the...

Previously, we showed that the sugar transporter MfsX in the major facilitator superfamily is involved in the pathogenicity of Dickeya dadantii (syn. Erwinia chrysanthemi). Here, we show that a mutation in this gene resulted in increased susceptibility to several antimicrobial agents, reduced biosynthesis of a blue pigment indigoidine, and reduced...

A research on the pathogenicity of Xanthomonas campestris pv. citri, the causal agent of citrus canker, has been carried out to study the growth characteristics of the pathogen on some media, physiological characteristics, and the role of extracellular protein on the bacterial pathogenicity. Extracellular protein of X. campestris pv. citri was extr...

Cucurbits grow throughout the Java island of Indonesia as dry season crops. However, the cucurbits cultivation has been faced with virus infections that reduce their production. Cucumber green mottle mosaic virus (CGMMV), which a member of the Genus Tobamovirus, has been reported infecting cucurbits in Indonesia. The most common symptoms of infecte...