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https://www.readbyqxmd.com/read/28432096/interaction-between-dapg-and-hcn-producing-pseudomonas-brassicacearum-lbum300-and-clavibacter-michiganensis-subsp-michiganensis-in-the-rhizosphere-of-tomato
#1
Mélanie M Paulin, Amy Novinscak, Carine Lanteigne, Vijay J Gadkar, Martin Filion
We have previously demonstrated that inoculation of tomato plants with 2,4-diacetylphloroglucinol (DAPG) and hydrogen cyanide (HCN) producing Pseudomonas brassicacearum LBUM300 could significantly reduce bacterial canker symptoms caused by Clavibacter michiganensis subsp. michiganensis (Cmm). In this study, in order to better characterize the population dynamics of LBUM300 in the rhizosphere of tomato plants, we characterized the role played by DAPG and HCN production by LBUM300 on rhizosphere colonization of healthy and Cmm-infected tomato plants...
April 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28432094/the-use-of-synthetic-hybrid-strains-to-determine-the-role-of-replicon-3-in-virulence-of-the-burkholderia-cepacia-complex
#2
Kirsty Agnoli, Roman Freitag, Margarida C Gomes, Christian Jenul, Angela Suppiger, Olga Mannweiler, Carmen Frauenknecht, Daniel Janser, Annette C Vergunst, Leo Eberl
The Burkholderia cepacia complex (Bcc) displays a wealth of metabolic diversity with great biotechnological potential, but the utilisation of these bacteria is limited by their opportunistic pathogenicity to humans. The third replicon of the Bcc, megaplasmid pC3 (0.5 to 1.4 Mb, previously chromosome 3), is important for various phenotypes, including virulence, antifungal and proteolytic activities, and the utilization of certain substrates. Approximately half of plasmid pC3 is well-conserved throughout sequenced Bcc members, while the other half is not...
April 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28430944/plant-microbial-diversity-is-suggested-as-the-key-to-future-biocontrol-and-health-trends
#3
Gabriele Berg, Martina Köberl, Daria Rybakova, Henry Müller, Rita Grosch, Kornelia Smalla
The microbiome of plants plays a crucial role in both plant and ecosystem health. Rapid advances in multi-omics tools are dramatically increasing access to the plant microbiome and consequently to the identification of its links with diseases and to the control of those diseases. Recent insights reveal a close, often symbiotic relationship between microorganisms and plants. Microorganisms can stimulate germination and plant growth, prevent diseases, and promote stress resistance and general fitness. Plants and their associated microorganisms form a holo-biont and have to be considered as co-evolved species assemblages consisting of bacterial, archaeal, and diverse eukaryotic species...
April 19, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28424477/warming-impact-on-herbivore-population-composition-affects-top-down-control-by-predators
#4
Ying-Jie Wang, Takefumi Nakazawa, Chuan-Kai Ho
Understanding warming impact on herbivores facilitates predicting plant/crop dynamics in natural/agricultural systems. However, it remains unclear how warming will affect herbivore population size and population composition, consequently altering herbivore colonization in a tri-trophic system (plant-herbivore-predator or crop-pest-biocontrol agent). We studied a soybean-aphid-lady beetle system, by conducting (1) a laboratory warming experiment to examine warming impact (+2 °C or +4 °C) on the aphid population size and composition (alate proportion), and (2) a field colonization experiment to examine whether the warming-induced effect subsequently interacts with predators (lady beetles) in affecting aphid colonization...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28423420/functional-response-of-eretmocerus-delhiensis-on-trialeurodes-vaporariorum-by-parasitism-and-host-feeding
#5
Jafar Ebrahimifar, Arsalan Jamshidnia, Hossein Allahyari
The parasitoid wasp, Eretmocerus delhiensis (Hymenoptera, Aphelinidae) is a thelytokous and syn-ovigenic parasitoid. To evaluate E. delhiensis as a biocontrol agent in greenhouse, the killing efficiency of this parasitoid by parasitism and host-feeding, were studied. Killing efficiency can be compared by estimation of functional response parameters. Laboratory experiments were performed in controllable conditions to evaluate the functional response of E. delhiensis at eight densities (2, 4, 8, 16, 32, 64, 100, and 120 third nymphal stage) of Trialeurodes vaporariorum (Hemiptera, Aleyrodidae) on two hosts including; tomato and prickly lettuce...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28420231/biological-control-of-aflatoxin-contamination-in-us-crops-and-the-use-of-bioplastic-formulations-of-aspergillus-flavus-biocontrol-strains-to-optimize-application-strategies
#6
Hamed K Abbas, Cesare Accinelli, W Thomas Shier
Aflatoxin contamination has a major economic impact on crop production in southern USA. Reduction of aflatoxin contamination in harvested crops has been achieved by applying non-aflatoxigenic biocontrol Aspergillus flavus strains that can out-compete wild aflatoxigenic A. flavus, reducing their numbers at the site of application. Currently, the standard method for applying biocontrol A. flavus strains to soil is using a nutrient-supplying carrier (e.g., pearled barley for Afla-Guard®). Granules of bioplastic (partially acetylated corn starch) have been investigated as an alternative nutritive carrier for biocontrol agents...
April 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28407475/fungal-endophytes-of-wild-and-hybrid-vitis-leaves-and-their-potential-for-vineyard-biocontrol
#7
Gavin Kernaghan, Michael Mayerhofer, Amanda Griffin
Plants are colonized by diverse assemblages of fungal endophytes that have potential as biocontrol agents for a variety of crops, including grapevine. Although the diversity of symbionts can be very high in wild plants, the fungal endophytes of wild Vitis plants have not yet been investigated. We surveyed the fungal endophytes of six wild populations of Vitis riparia, as well as a cold tolerant, hybrid grapevine in five vineyards (one certified organic), using 454 pyrosequencing. We detected between 43 and 235 OTUs per sample, with the highest richness and diversity in the wild, the lowest in conventional vineyards, and intermediate levels in the organic vineyard...
April 13, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28405283/anolis-lizards-as-biocontrol-agents-in-mainland-and-island-agroecosystems
#8
Ivan V Monagan, Jonathan R Morris, Alison R Davis Rabosky, Ivette Perfecto, John Vandermeer
Our knowledge of ecological interactions that bolster ecosystem function and productivity has broad applications to the management of agricultural systems. Studies suggest that the presence of generalist predators in agricultural landscapes leads to a decrease in the abundance of herbivorous pests, but our understanding of how these interactions vary across taxa and along gradients of management intensity and eco-geographic space remains incomplete. In this study, we assessed the functional response and biocontrol potential of a highly ubiquitous insectivore (lizards in the genus Anolis) on the world's most important coffee pest, the coffee berry borer (Hypothalemus hampei)...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28404795/dynamics-of-the-interaction-between-cotton-bollworm-helicoverpa-armigera-and-nucleopolyhedrovirus-as-revealed-by-integrated-transcriptomic-and-proteomic-analyses
#9
Longsheng Xing, Chuanfei Yuan, Manli Wang, Zhe Lin, Benchang Shen, Zhihong Hu, Zhen Zou
Over the past decades, Helicoverpa armigera nucleopolyhedrovirus (HearNPV) has been widely used for biocontrol of cotton bollworm, which is one of the most destructive pest insects in agriculture worldwide. However, the molecular mechanism underlying the interaction between HearNPV and host insects remains poorly understood. In this study, high throughput RNA-sequencing was integrated with label-free quantitative proteomics analysis to examine the dynamics of gene expression in the fat body of H. armigera larvae in response to challenge with HearNPV...
April 12, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28402389/impacts-of-the-psyllid-arytinnis-hakani-homoptera-psyllidae-on-invasive-french-broom-in-relation-to-plant-size-and-psyllid-density
#10
Brian N Hogg, Patrick J Moran, Lincoln Smith
The impacts of weed biological control agents may vary with plant ontogeny. As plants grow, structural and chemical changes can alter plant resistance, which may reduce herbivory via chemical or structural defenses, and plant tolerance, which may enable plants to maintain fitness despite attack. Resistance and tolerance generally increase as plants grow. Nonetheless, prerelease tests of agent efficacy often overlook plant ontogeny. Here, we assess the performance and impacts of a candidate biocontrol agent, the psyllid Arytinnis hakani (Loginova), in relation to the age of its host plant, the invasive shrub French broom, Genista monspessulana...
April 10, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28401463/crop-specific-plant-growth-promoting-effects-of-accd-enzyme-and-siderophore-producing-and-cynogenic-fluorescent-pseudomonas
#11
Priyanka, Toshy Agrawal, Anil S Kotasthane, Ashok Kosharia, Renu Kushwah, Najam Waris Zaidi, U S Singh
Fluorescent Pseudomonas, aerobic, Gram-negative bacteria possess many traits that make them well suited as biocontrol and growth promoting agents. Our study revealed that isolates vary in mechanisms involved in the antagonist interactions against pathogen and growth stimulatory effects on host plant. Most of the potential antagonistic fluorescent Pseudomonas identified were avid iron chelators (P233, P201, 176, P76 and, P76). Wide variation in ACCd enzyme production was observed. ACCd enzyme assay tested P141 > P247 > P126, as potential ACCd enzyme producer...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28398122/investigating-proteome-and-transcriptome-defense-response-of-apples-induced-by-yarrowia-lipolytica
#12
Hongyin Zhang, Liangliang Chen, Yiwen Sun, Lina Zhao, Xiangfeng Zheng, Qiya Yang, Xiaoyun Zhang
A better understanding of the mode of action of postharvest biocontrol agents on fruit surfaces is critical for the advancement of successful implementation of postharvest biocontrol products. This is due to the increasing importance of biological control of postharvest diseases over chemical and other control methods. However, most of the mechanisms involved in biological control remain unknown and need to be explored. Yarrowia lipolytica significantly inhibited blue mold decay of apples caused by Penicillium expansum...
April 10, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28398103/endophytic-fungi-associated-with-monarda-citriodora-an-aromatic-and-medicinal-plant-and-their-biocontrol-potential
#13
Meenu Katoch, Shipra Pull
CONTEXT: The Food and Agriculture Organization has estimated that every year considerable losses of the food crops occur due to plant diseases. Although fungicides are extensively used for management of plant diseases, they are expensive and hazardous to the environment and human health. Alternatively, biological control is the safe way to overcome the effects of plant diseases and to sustain agriculture. Since Monarda citriodora Cerv. ex Lag. (Lamiaceae/Labiatae) is known for its antifungal properties, it was chosen for the study...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/28394635/prevention-of-fungal-spoilage-in-food-products-using-natural-compounds-a-review
#14
Susana Ribes, Ana Fuentes, Pau Talens, Jose Manuel Barat
The kingdom Fungi is the most important group of microorganism contaminating food commodities, and chemical additives are commonly used in the food industry to prevent fungal spoilage. However, the increasing consumer concern about synthetic additives has led to their substitution by natural compounds in foods. The current review provides an overview of using natural agents isolated from different sources (plants, animals and microorganisms) as promising antifungal compounds, including information about their mechanism of action and their use in foods to preserve and prolong shelf life...
April 10, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28392780/biocontrol-potentials-of-antimicrobial-peptide-producing-bacillus-species-multifaceted-antagonists-for-the-management-of-stem-rot-of-carnation-caused-by-sclerotinia-sclerotiorum
#15
S Vinodkumar, S Nakkeeran, P Renukadevi, V G Malathi
Bacillus species are widely exploited as biocontrol agents because of their efficiency in impeding various plant pathogens with multifaceted approach. In this study, Bacillus species were isolated from rhizosphere of various plants viz., carnations, cotton, turmeric, and bananas in Tamil Nadu state of India. Their potential to control the mycelial growth of Sclerotinia sclerotiorum was assessed in vitro by dual plate and partition plate techniques. B. amyloliquefaciens strain VB7 was much effective in inhibiting mycelial growth (45% inhibition of over control) and sclerotial production (100%)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28389547/engineering-of-bacteriophages-y2-dpol1-c-and-y2-luxab-for-efficient-control-and-rapid-detection-of-the-fire-blight-pathogen-erwinia-amylovora
#16
Yannick Born, Lars Fieseler, Valentin Thöny, Nadja Leimer, Brion Duffy, Martin J Loessner
Erwinia amylovora is the causative agent of fire blight, a devastating plant disease affecting members of the Rosaceae Alternatives to antibiotics for control of fire blight symptoms and outbreaks are highly desirable, due to increasing drug-resistance and tight regulatory restrictions. Moreover, the available diagnostic methods either lack sensitivity, speed, or are unable to discriminate between live and dead bacteria. Owing to their extreme biological specificity, bacteriophages are promising alternatives for both aims...
April 7, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28385848/draft-genome-sequence-of-the-rhizobacterium-pseudomonas-chlororaphis-pcl1601-displaying-biocontrol-against-soilborne-phytopathogens
#17
Carmen Vida, Antonio de Vicente, Francisco M Cazorla
In this study, we present the draft genome sequence of the bacterial strain Pseudomonas chlororaphis PCL1601. This bacterium was isolated from the rhizosphere of healthy avocado trees and displayed antagonistic and biological control activities against different soilborne phytopathogenic fungi and oomycetes.
April 6, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28385834/complete-genome-sequence-of-ralstonia-solanacearum-fjat-1458-a-potential-biocontrol-agent-for-tomato-wilt
#18
Deju Chen, Bo Liu, Yujing Zhu, Jieping Wang, Zheng Chen, Jiamei Che, Xuefang Zheng, Xiaoqiang Chen
An avirulent strain of Ralstonia solanacearum FJAT-1458 was isolated from a living tomato. Here, we report the complete R. solanacearum FJAT-1458 genome sequence of 6,059,899 bp and 5,241 genes. This bacterial strain is a potential candidate as a biocontrol agent in the form of a plant vaccine for bacterial wilt.
April 6, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28383905/construction-and-rescue-of-a-functional-synthetic-baculovirus
#19
Yu Shang, Manli Wang, Gengfu Xiao, Xi Wang, Dianhai Hou, Kai Pan, Shurui Liu, Jiang Li, Jun Wang, Basil M Arif, Just M Vlak, Xinwen Chen, Hualin Wang, Fei Deng, Zhihong Hu
Synthetic viruses provide a powerful platform to delve deeper into the nature and function of viruses as well as to engineer viruses with novel properties. So far, most synthetic viruses have been RNA viruses (<30 kb) and small DNA viruses, such as bacteriophage phiX174. Baculoviruses contain a large circular dsDNA genome of 80-180 kb and have been used as biocontrol agents and protein expression vectors. Here, we report on the first synthesis of a baculovirus based on the type species Autographa californica nucleopolyhedrovirus, AcMNPV, by a combination of PCR and transformation-associated recombination in yeast...
April 6, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28382937/entomopathogenic-nematodes-in-agricultural-areas-in-brazil
#20
Andressa Lima de Brida, Juliana Magrinelli Osório Rosa, Cláudio Marcelo Gonçalves de Oliveira, Bárbara Monteiro de Castro E Castro, José Eduardo Serrão, José Cola Zanuncio, Luis Garrigós Leite, Silvia Renata Siciliano Wilcken
Entomopathogenic nematodes (EPNs) (Steinernematidae and Heterorhabditidae) can control pests due to the mutualistic association with bacteria that kill the host by septicemia and make the environment favorable for EPNs development and reproduction. The diversity of EPNs in Brazilian soils requires further study. The identification of EPNs, adapted to environmental and climatic conditions of cultivated areas is important for sustainable pest suppression in integrated management programs in agricultural areas of Brazil...
April 6, 2017: Scientific Reports
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