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Biocontrol

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https://www.readbyqxmd.com/read/28634804/biocontrol-of-the-wheat-pathogen-zymoseptoria-tritici-using-cyclic-lipopeptides-from-bacillus-subtilis
#1
Samara Mejri, Ali Siah, François Coutte, Maryline Magnin-Robert, Béatrice Randoux, Benoit Tisserant, François Krier, Philippe Jacques, Philippe Reignault, Patrice Halama
Innovation toward ecofriendly plant protection products compatible with sustainable agriculture and healthy food is today strongly encouraged. Here, we assessed the biocontrol activity of three cyclic lipopeptides from Bacillus subtilis (mycosubtilin, M; surfactin, S; fengycin, F) and two mixtures (M + S and M + S + F) on wheat against Zymoseptoria tritici, the main pathogen on this crop. Foliar application of these biomolecules at a 100-mg L(-1) concentration on the wheat cultivars Dinosor and Alixan, 2 days before fungal inoculation, provided significant reductions of disease severity...
June 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28634478/transcriptional-and-antagonistic-responses-of-biocontrol-strain-lysobacter-enzymogenes-oh11-to-the-plant-pathogenic-oomycete-pythium-aphanidermatum
#2
Yangyang Zhao, Guoliang Qian, Yuan Chen, Liangcheng Du, Fengquan Liu
Lysobacter enzymogenes is a ubiquitous, beneficial, plant-associated bacterium emerging as a novel biological control agent. It has the potential to become a new source of antimicrobial secondary metabolites such as the Heat-Stable Antifungal Factor (HSAF), which is a broad-spectrum antimycotic with a novel mode of action. However, very little information about how L. enzymogenes detects and responds to fungi or oomycetes has been reported. An in vitro confrontation bioassay between the pathogenic oomycete Pythium aphanidermatum and the biocontrol bacterial strain L...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28629321/the-biocontrol-agent-pseudomonas-chlororaphis-pa23-primes-brassica-napus-defenses-through-distinct-gene-networks
#3
Kelly A Duke, Michael G Becker, Ian J Girard, Jenna L Millar, W G Dilantha Fernando, Mark F Belmonte, Teresa R de Kievit
BACKGROUND: The biological control agent Pseudomonas chlororaphis PA23 is capable of protecting Brassica napus (canola) from the necrotrophic fungus Sclerotinia sclerotiorum via direct antagonism. While we have elucidated bacterial genes and gene products responsible biocontrol, little is known about how the host plant responds to bacterial priming on the leaf surface, including global changes in gene activity in the presence and absence of S. sclerotiorum. RESULTS: Application of PA23 to the aerial surfaces of canola plants reduced the number of S...
June 19, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28624685/bacillus-subtilis-affects-mirnas-and-flavanoids-production-in-agrobacterium-tobacco-interaction
#4
Fahimeh Nazari, Naser Safaie, Bahram Mohammad Soltani, Masoud Shams-Bakhsh, Mohsen Sharifi
Agrobacterium tumefaciens is a very destructive plant pathogen. Selection of effective biological agents against this pathogen depends on more insight into molecular plant defence responses during the biocontrol agent-pathogen interaction. Auxin as a phytohormone is a key contributor in pathogenesis and plant defence and accumulation of auxin transport carriers are accompanied by increasing in flavonoid and miRNAs concentrations during plant interactions with bacteria. The aim of this research was molecular analysis of Bacillus subtilis (ATCC21332) biocontrol effect against A...
June 10, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28621084/coregulation-of-the-cyclic-lipopeptides-orfamide-and-sessilin-in-the-biocontrol-strain-pseudomonas-sp-cmr12a
#5
Feyisara E Olorunleke, Nam P Kieu, Evelien De Waele, Marc Timmerman, Marc Ongena, Monica Höfte
Cyclic lipopeptides (CLPs) are synthesized by nonribosomal peptide synthetases (NRPS), which are often flanked by LuxR-type transcriptional regulators. Pseudomonas sp. CMR12a, an effective biocontrol strain, produces two different classes of CLPs namely sessilins and orfamides. The orfamide biosynthesis gene cluster is flanked up- and downstream by LuxR-type regulatory genes designated ofaR1 and ofaR2, respectively, whereas the sessilin biosynthesis gene cluster has one LuxR-type regulatory gene which is situated upstream of the cluster and is designated sesR...
June 15, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28620396/identification-of-a-potential-isr-determinant-from-pseudomonas-aeruginosa-pm12-against-fusarium-wilt-in-tomato
#6
Sabin Fatima, Tehmina Anjum
Biocontrol of plant diseases through induction of systemic resistance is an environmental friendly substitute to chemicals in crop protection measures. Different biotic and abiotic elicitors can trigger the plant for induced resistance. Present study was designed to explore the potential of Pseudomonas aeruginosa PM12 in inducing systemic resistance in tomato against Fusarium wilt. Initially the bioactive compound, responsible for ISR, was separated and identified from extracellular filtrate of P. aeruginosa PM12...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28619794/complete-genome-sequence-of-biocontroller-bacillus-velezensis-strain-jtyp2-isolated-from-leaves-of-echeveria-laui
#7
Beibei Wang, Hu Liu, Hailin Ma, Chengqiang Wang, Kai Liu, Yuhuan Li, Qihui Hou, Ruofei Ge, Tongrui Zhang, Fangchun Liu, Jinjin Ma, Yun Wang, Haide Wang, Baochao Xu, Gan Yao, Wenfeng Xu, Lingchao Fan, Yanqin Ding, Binghai Du
Bacillus velezensis JTYP2 was isolated from the leaves of Echeveria laui in Qingzhou, China, and may control some of the fungal pathogens of the plant. Here, we present the complete genome sequence of B. velezensis JTYP2. Several gene clusters related to its biosynthesis of antimicrobial compounds were predicted.
June 15, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28618714/lsp-family-proteins-regulate-antibiotic-biosynthesis-in-lysobacter-enzymogenes-oh11
#8
Ruping Wang, Huiyong Xu, Yangyang Zhao, Juan Zhang, Gary Y Yuen, Guoliang Qian, Fengquan Liu
Ax21 family proteins have been shown to play regulatory roles in plant- and animal-pathogenic species in the bacterial family Xanthomonadaceae, but the protein have not been investigated previously in the non-pathogenic members of this bacterial family. Lysobacter enzymogenes, is a non-pathogenic species known for its capacity as a biocontrol agent of plant pathogens. It is also noted for the production of antimicrobial secondary metabolites, heat stable antifungal factor (HSAF) and WAP-8294A2, that have potential for agricultural and pharmaceutical applications...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28617527/impact-of-motility-and-chemotaxis-features-of-the-rhizobacterium-pseudomonas-chlororaphis-pcl1606-on-its-biocontrol-of-avocado-white-root-rot
#9
Álvaro Polonio, Carmen Vida, Antonio de Vicente, Francisco M Cazorla
The biocontrol rhizobacterium Pseudomonas chlororaphis PCL1606 has the ability to protect avocado plants against white root rot produced by the phytopathogenic fungus Rosellinia necatrix. Moreover, PCL1606 displayed direct interactions with avocado roots and the pathogenic fungus. Thus, nonmotile (flgK mutant) and non-chemotactic (cheA mutant) derivatives of PCL1606 were constructed to emphasize the importance of motility and chemotaxis in the biological behaviour of PCL1606 during the biocontrol interaction...
June 2017: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28615866/virulence-assay-and-role-of-bacillus-thuringiensis-ts110-as-biocontrol-agent-against-the-larval-stages-of-rice-leaffolder-cnaphalocrocis-medinalis
#10
Tuhin Subhra Ghosh, Soumendranath Chatterjee, Syed Afrin Azmi, Abhijit Mazumdar, Tushar Kanti Dangar
The bacterial isolate Bacillus thuringiensis TS110 was isolated from the rice field soil of Burdwan district, West Bengal, India. Bioassay test of the bacteria TS110 against 3rd, 4th and 5th instar larvae of Cnaphalocrocis medinalis was carried out. Cut leaf assay, potted plant assay and field assay were done. During filed assay, it has been observed that the LC50 (×10(7)) values of TS110 against 3rd, 4th and 5th instar larvae of C. medinalis were 3.77, 5.29, 4.83 and 4.93, 4.42, 4.72 in dry and wet season, respectively...
June 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28615734/the-role-of-organic-acids-on-microbial-deterioration-in-the-radix-pseudostellariae-rhizosphere-under-continuous-monoculture-regimes
#11
Hongmiao Wu, Linkun Wu, Quan Zhu, Juanying Wang, Xianjin Qin, Jiahui Xu, Lufei Kong, Jun Chen, Sheng Lin, Muhammad Umar Khan, Hira Amjad, Wenxiong Lin
A three-year field monoculture trial of Radix pseudostellariae and complementary laboratory studies were conducted to further elucidate the underlying mechanism responsible for significant decreases in the biomass yield and quality of R. pseudostellariae under continuous monoculture regimes. HPLC analysis indicated that continuous monoculture soil was rich in organic acids, which had cumulative effects over time. Further analysis suggested that the application of a mixture of organic acids significantly promoted growth of pathogenic fungi, and increased the expression of chemotaxis-related gene (cheA) and biofilm formation of the specific pathogenic Kosakonia sacchari...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28611802/involvement-of-trichoderma-harzianum-epl-1-protein-in-the-regulation-of-botrytis-virulence-and-tomato-defense-related-genes
#12
Eriston V Gomes, Cirano J Ulhoa, Rosa E Cardoza, Roberto N Silva, Santiago Gutiérrez
Several Trichoderma spp. are well known for their ability to: (i) act as important biocontrol agents against phytopathogenic fungi; (ii) function as biofertilizers; (iii) increase the tolerance of plants to biotic and abiotic stresses; and (iv) induce plant defense responses via the production and secretion of elicitor molecules. In this study, we analyzed the gene-regulation effects of Trichoderma harzianum Epl-1 protein during the interactions of mutant Δepl-1 or wild-type T. harzianum strains with: (a) the phytopathogen Botrytis cinerea and (b) with tomato plants, on short (24 h hydroponic cultures) and long periods (4-weeks old plants) after Trichoderma inoculation...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28610997/identification-of-multienzymatic-complexes-in-the-clonostachys-byssicola-secretomes-produced-in-response-to-different-lignocellulosic-carbon-sources
#13
Helder Andrey Rocha Gomes, Adelson Joel da Silva, Diana Paola Gómez-Mendoza, Agenor Castro Moreira Dos Santos Júnior, Nicholas de Mojana di Cologna, Rosane Mansan Almeida, Robert Neil Gerard Miller, Wagner Fontes, Marcelo Valle de Sousa, Carlos André Ornelas Ricart, Edivaldo Ximenes Ferreira Filho
Multienzymatic complexes with plant lignocellulose-degrading activities have recently been identified in filamentous fungi secretomes. Such complexes have potential biotechnological applications in the degradation of agro-industrial residues. Fungal species from the Clonostachys genus have been intensively investigated as biocontrol agents; however so far their use as producers of lignocellulose-degrading enzymes has not been extensively explored. Secretomes of Clonostachys byssicola following growth on different carbon sources (passion fruit peel, soybean hulls, cotton gin trash, banana stalk, sugarcane bagasse, orange peel, and a composition of soybean hulls: cotton gin trash:orange peel) were subjected to enzymatic assays...
June 10, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28607437/single-stranded-rna-viruses-infecting-the-invasive-argentine-ant-linepithema-humile
#14
Monica A M Gruber, Meghan Cooling, James W Baty, Kevin Buckley, Anna Friedlander, Oliver Quinn, Jessica F E J Russell, Alexandra Sébastien, Philip J Lester
Social insects host a diversity of viruses. We examined New Zealand populations of the globally widely distributed invasive Argentine ant (Linepithema humile) for RNA viruses. We used metatranscriptomic analysis, which identified six potential novel viruses in the Dicistroviridae family. Of these, three contigs were confirmed by Sanger sequencing as Linepithema humile virus-1 (LHUV-1), a novel strain of Kashmir bee virus (KBV) and Black queen cell virus (BQCV), while the others were chimeric or misassembled sequences...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28606352/applications-of-volatile-compounds-acquired-from-muscodor-heveae-against-white-root-rot-disease-in-rubber-trees-hevea-brasiliensis-m%C3%A3-ll-arg-and-relevant-allelopathy-effects
#15
Sakuntala Siri-Udom, Nakarin Suwannarach, Saisamorn Lumyong
The bioactive compounds of the volatile metabolite-producing endophytic fungus, Muscodor heveae, were examined by the process of biofumigation for the purposes of controlling white root rot disease in rubber trees (Hevea brasiliensis Müll. Arg.). Volatile organic compounds (VOCs) of M. heveae possess antimicrobial activity against Rigidoporus microporus in vitro with 100 % growth inhibition. The synthetic volatile compounds test confirmed that the major component, 3-methylbutan-1-ol, and the minor compounds, 3-methylbutyl acetate and 2-methylpropanoic acid, inhibited root and shoot growth in the tested plants 3-methylbutan-1-ol showed ED50 value and MIQ value on seed germination of ruzi grass, Arabidopsis thaliana Col-0 and tomato at 10, 5 and 5 μL(-1) airspace, respectively...
June 2017: Fungal Biology
https://www.readbyqxmd.com/read/28605157/different-mechanisms-of-trichoderma-virens-mediated-resistance-in-tomato-against-fusarium-wilt-involve-the-jasmonic-and-salicylic-acid-pathways
#16
Sudisha Jogaiah, Mostafa Abdelrahman, Lam-Son Phan Tran, Shin-Ichi Ito
In the present study, we investigated the role of Trichoderma virens (TriV_JSB100) spores or cell-free culture filtrate in regulating the growth and activating the defence responses of tomato (Solanum lycopersicum) plants against Fusarium oxysporum f. sp. lycopersici by developing a biocontrol-plant-pathogen interaction system. Two-week-old tomato seedlings primed with TriV_JSB100 spores cultured on barley grains (BGS) or cell-free culture filtrate (CF) were inoculated with Fusarium pathogen under greenhouse conditions; this resulted in significant lower disease incidence in tomato Oogata-Fukuju plants treated with BGS than in CF-treated plants...
June 12, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28604819/a-genome-scale-metabolic-reconstruction-of-lysinibacillus-sphaericus-unveils-unexploited-biotechnological-potentials
#17
Camilo Gómez-Garzón, Alejandra Hernández-Santana, Jenny Dussán
The toxic lineage (TL) of Lysinibacillus sphaericus has been extensively studied because of its potential biotechnological applications in biocontrol of mosquitoes and bioremediation of toxic metals. We previously proposed that L. sphaericus TL should be considered as a novel species based on a comparative genomic analysis. In the current work, we constructed the first manually curated metabolic reconstruction for this species on the basis of the available genomes. We elucidated the central metabolism of the proposed species and, beyond confirming the reported experimental evidence with genomic a support, we found insights to propose novel applications and traits to be considered in further studies...
2017: PloS One
https://www.readbyqxmd.com/read/28600796/efficacy-of-bacillus-amyloliquefaciens-as-biocontrol-agent-to-fight-fungal-diseases-of-maize-under-tropical-climates-from-lab-to-field-assays-in-south-kivu
#18
Parent Zihalirwa Kulimushi, Géant Chuma Basime, Gustave Mushagalusa Nachigera, Philippe Thonart, Marc Ongena
In the province of South Kivu (Democratic Republic of Congo), warm and humid climatic conditions favor the development and spreading of phytopathogens. The resulting diseases cause important losses in production both in crop and after harvest. In this study, we wanted to evaluate the potential of Bacillus amyloliquefaciens as biocontrol agent to fight some newly isolated endemic fungal pathogens infesting maize. The strain S499 has been selected based on its high in vitro antagonistic activity correlating with a huge potential to secrete fungitoxic lipopeptides upon feeding on maize root exudates...
June 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28600590/do-multi-year-applications-of-bacillus-thuringiensis-subsp-israelensis-for-control-of-mosquito-larvae-affect-the-abundance-of-b-cereus-group-populations-in-riparian-wetland-soils
#19
Salome Schneider, Tania Tajrin, Jan O Lundström, Niels B Hendriksen, Petter Melin, Ingvar Sundh
Bacillus thuringiensis subsp. israelensis (Bti) is a soil-borne bacterium affiliated to the Bacillus cereus group (Bcg) and has been used in biocontrol products against nematoceran larvae for several decades. However, knowledge is limited on whether long-term Bti application can affect the structure of indigenous communities of Bcg and the overall abundance of Bti. Using species- and group-specific quantitative PCR assays, we measured the Bcg- and Bti-abundances in riparian wetlands in the River Dalälven floodplains of central Sweden...
June 10, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28600514/bactericidal-metabolites-from-phellinus-noxius-hn-1-against-microcystis-aeruginosa
#20
Pengfei Jin, Haonan Wang, Wenbo Liu, Shujian Zhang, Chunhua Lin, Fucong Zheng, Weiguo Miao
Harmful algal blooms cause serious problems worldwide due to large quantities of cyanotoxins produced by cyanobacteria in eutrophic water. In this study, a new compound named 2-(3, 4-dihydroxy-2-methoxyphenyl)-1, 3-benzodioxole-5-carbaldehyde (Compound 1), together with one known compound, 3, 4-dihydroxybenzalacetone (DBL), was purified from Phellinus noxius HN-1 (CCTCC M 2016242). Compound 1 and DBL displayed activity against the cyanobacteria Microcystis aeruginosa with a half maximal effective concentration of 21 and 5 μg/mL, respectively...
June 9, 2017: Scientific Reports
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