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Preliminary study on three pathogens with po-tential biological control in Barnyard grass(Echinochloa crus-galli)

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Chinese Rice Research Newsletter 2000年第1期8卷 8-9页

作者： HUANGShiwen AlanK.Waston DUANGuifang YULiuqing CRNNI Hangzhou310006China IRRI MakatiCity2171thePhilippines

More than 10 species of pathogenic fungi were isolated from the naturally infected leaves of barnyard grass (Echinochloa crus-galli) in paddy. After preliminary bioassaying, it was found that the Alternaria alternata (Fr.) keissler(AA), Exserohilum monoceras (EM),and '99-10' were three potential agents for biological control of barnyard grass.

关键词： Alternaria alternata biological control species of

A venom protein of ectoparasitoid Pachycrepoideus vindemiae, PvG6PDH, contributes to parasitism by inhibiting host glucose-6-phosphate metabolism

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Insect Science 2022年第2期29卷 399-410页

作者： Lei Yang Liming Qiu Qi Fang Shaoying Wu Gongyin Ye Hainan University Haikou570228 China State Key Laboratory of Rice Biology&Ministry of Agricultural and Rural Affairs Key Laboratory of Molecular Biology of Crop Pathogens and Insects Institute of Insect SciencesZhejiang UniversityHangzhou310058 China

To achieve successful development,female parasitoids,while laying eggs,introduce various virulence factors,mainly venoms,into host insects to manipulate their physiology.Although numerous studies have been conducted to characterize the components of venoms that regulate host immune responses,few systematic investigations have been conducted on the roles of venom proteins in host metabolic regulation.In this investigation,we characterized a novel venom protein in Pachycrepoideus vindemiae called glucose-6-phosphate dehydrogenase(PvG6PDH)and showed it has a vital role in regulating host carbohydrate metabolism.PvG6PDH encodes 510 amino acids and features a signal peptide and two conserved“G6PDH”domains.Multiple sequence alignment showed it has high amino acid identity with G6PDH from other pteromalids,and quantitative polymerase chain reaction analysis and immunofluorescent staining demonstrated a significantly higher expression of PvG6PDH in the venom apparatus compared with the carcass.We report that PvG6PDH contributes to parasitism by inhibiting the glucose-6-phosphate(G6P)metabolism of host Drosophila melanogaster,as demonstrated by PvG6PDH injection and RNA interference analysis.Further tests revealed that the accumulation of host G6P was caused by the transcriptional inhibition of G6P-metabolism-related genes.These findings greatly contribute to our understanding of venom-mediated host metabolic regulation,further laying the foundation for the development of venom proteins as biological agents for pest control.

关键词： biological control metabolism Pachycrepoideus vindemiae parasitoid venom

Establishment of Beauveria bassiana as a fungal endophyte in potato plants and its virulence against potato tuber moth, Phthorimaea operculella (Lepidoptera: Gelechiidae)

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Insect Science 2023年第1期30卷 197-207页

作者： Meng-Di Zhang Sheng-Yong Wu Jun-Jie Yan Stuart Reitz Yu-Lin Gao State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBejingChina Department of Crop and Soil Sciences Malheur Experiment StationOregon State UniversityOntarioORUSA National Center of Excellence for Tuber and Root Crop Research Chinese Academy of Agricultural SciencesBeijingChina

The potato tuber moth,Phthorimaea operculella,is the most damaging potato pest in the world and is difficult to control as the larvae are internal feeders in the foliage and tubers.Entomopathogenic fungi that colonize plants as endophytes have lethal and sublethal pathological effects on insect pests.We show that Beauveria bassiana colonizes the aerial parts of potato plants endophytically after inoculation through soil drenching.Endophytic B.bassiana persisted in potato foliage for more than 50 days postinoculation.Bioassays indicated that foliage of B.bassiana-inoculated potato plants were pathogenic against larvae of P operculella.Sublethal experiments indicated that B.bassiana negatively affected the growth,development,and reproduction of P operculella.Development experiments showed that the weight of P.operculella pupae reared on B.bassianacolonized potato plants(4.25 mg)was significantly less than that of those reared on uninoculated control plants(8.89mg).Compared with newly eclosed larvaefed on control plants,those fed on B.bassiana-inoculated plants had significantly lower survivorship,with only 17.8%developing to the adult stage.Oviposition of P operculella females reared on B.bassiana endophytically colonized plants was significantly lower(35 eggs/female)than of those reared on uninoculated plants(115 eggs/female).This study demonstrates that endophytic B.bassiana can be a potential biological control agent for the control and management of P operculella.Comparing pupal weights of P operculella reared on potato plants inoculated with the B.bassiana strain GZGY-1-3 and on untreated control plants,pupae from the control plants were significantly heavier than those from treated plants.

关键词： Beauveria bassiana biological control colonization Phthorimaea operculella

Potential of Some Antagonistic Bacteria for biological control of Potato Late Blight Caused by Phytophthora infestans

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Potential of Some Antagonistic Bacteria for Biological Contr...

The disease resistance potential of Trichoderma asperellum T-Pa2 isolated from Phellodendron amurense rhizosphere soil

中国菌物学会2018年学术年会

作者： Long Han Jichuan Kang Bangxing Lei College of Life Science Guizhou University Engineering and Research Center for Southwest Bio-Pharmaceutical Resources of National Education Ministry of China Guizhou University

Seven bacteria strains（Bacillus amyloliquefaciens D1, Stenotrophomonas maltophilia he41, Bacillus amyloliquefaciens Hd213, Bacillus subtilis H3, Bacillus amyloliquefaciens DEB-2, Brevundimonas bullata Hd13,Lysinibacillus fusiformis he14） were tested in vitro for antagonistic properties against Phytophthora infestans, the causal agent of potato late blight. Different antagonistic bacteria were selected according to their inhibition effect on growth of Phytophthora infestans that caused potato late blight via dual-culture method. The inhibition rates of the 7 strains against mycelia growth of Phytophthora infestans were tested via flat plate pair method, of which 4 strains viz. he14, Hd213, Hd13 and D1 had the inhibition effect greater than 60%, and he14 had the highest inhibition effect of 67%. Meanwhile the fermentation broth of the strains showed significant inhibition effect on Phytophthora infestans, and the effect was enhanced by increasing the concentrations of the both. When their broth concentrations were 4%, the inhibition rates of D1 and H3 strains reached 100% respectively. In addition,the inhibition rates of all strains were 100% with the broth conentrations of 64%, which indicated that these bacterial strains had a great potential for the biological control of potato late blight.

关键词： Potato late blight,Phytophthora infestans Antagonistic bacteria biological control

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Journal of Forestry Research 2022年第1期33卷 321-331页

作者： Zeyang Yu Zhihua Liu Yuzhou Zhang Zhiying Wang School of Forestry Northeast Forestry University26 Hexing RoadHarbin 150040People’s Republic of China General Station of Forest and Grassland Pest Management National Forestry and Grassland AdministrationShenyang 110034People’s Republic of China College of Forestry Shenyang Agricultural UniversityShenyang 110866People’s Republic of China

To promote the application of Trichoderma,many countries have collected Trichoderma resources.In the present study,nine isolates were isolated from a rhizosphere soil of Phellodendron amurense and were identified as three species:Trichoderma brevicompactum(one isolate),T.asperellum(two isolates),T.atroviride(six isolates).Dual culture experiments showed that T.asperellum T-Pa2 grew fast and produced the best inhibition rates against six tested pathogens(80.25–91.65%)via competition and mycoparasitism.Populus davidiana×P.alba var.pyramidalis Louche(PdPap poplar)was treated with T-Pa2,which increased the catalase activity,nitrate reductase activity,and content of osmosis molecules significantly(Pcontrol agents in forestry.

关键词： biological control Trichoderma identification Antifungal property Enzyme activity

High temperatures do not decrease biocontrol potential for the host-killing parasitoid Neochrysocharis formosa(Hymenoptera:Eulophidae)on agromyzid leafminers

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Journal of Integrative Agriculture 2022年第6期21卷 1722-1730页

作者： XUAN Jing-li XIAO Yue YE Fu-yu ZHANG Yi-bo TAO Shu-xia GUO Jian-yang LIU Wan-xue State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China College of Agronomy Jilin Agricultural UniversityChangchun 130118P.R.China Department of Entomology and Plant Pathology North Carolina State UniversityRaleigh 27607USA

Temperature, as a critical abiotic factor, might influence the effectiveness of biological control by parasitoids in hostparasitoid systems. In this study, Neochrysocharis formosa(Westwood), a larval endoparasitoid, is used to investigate the efficacy of biological control on a vegetable agriculture pest, Liriomyza sativae Blanchard, reared on kidney bean(Phaseolus vulgaris L.), at four constant temperatures(26, 29, 32, and 35℃) under laboratory conditions. Our results show that high temperatures(29, 32, and 35℃) do not significantly affect lifetime host-killing events of female adults by increased daily host-killing events compared to temperature of 26℃, although their lifespans decrease with an increase in temperatures. Each life-history trait of female adults(lifespan, parasitism, stinging, or non-reproductive host-killing events) present a linear relation with temperatures and host-feeding events, respectively. Our findings contribute to a better understanding of biocontrol efficacy of parasitoid N. formosa against agromyzid leafminers at high-temperature seasons or environments.

关键词： leaf-mining fly host-feeding parasitoid heat stress biological control

Bacterial-fungal interactions under agricultural settings:from physical to chemical interactions

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Stress Biology 2022年第1期2卷 411-427页

作者： Yaqi Zhou Hongkai Wang Sunde Xu Kai Liu Hao Qi Mengcen Wang Xiaoyulong Chen Gabriele Berg Zhonghua Ma Tomislav Cernava Yun Chen State Key Laboratory of Rice Biology and Key Laboratory of Molecular Biology of Crop Pathogens and InsectsInstitute of BiotechnologyZhejiang University866 Yuhangtang RoadHangzhou 310058China Key Laboratory of Molecular Biology of Crop Pathogens and Insects Ministry of AgricultureInstitute of Pesticide and Environmental ToxicologyZhejiang UniversityHangzhouChina Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of EducationGuizhou UniversityGuiyang 550025China Institute of Environmental Biotechnology Graz University of Technology8010 GrazAustria Leibniz-Institute for Agricultural Engineering and Bioeconomy PotsdamGermany University of Potsdam PotsdamGermany.

Bacteria and fungi are dominant members of environmental microbiomes.Various bacterial-fungal interactions(BFIs)and their mutual regulation are important factors for ecosystem functioning and health.Such interactions can be highly dynamic,and often require spatiotemporally resolved assessments to understand the interplay which ranges from antagonism to mutualism.Many of these interactions are still poorly understood,especially in terms of the underlying chemical and molecular interplay,which is crucial for inter-kingdom communication and interference.BFIs are highly relevant under agricultural settings;they can be determinative for crop health.Advancing our knowledge related to mechanisms underpinning the interactions between bacteria and fungi will provide an extended basis for biological control of pests and pathogens in agriculture.Moreover,it will facilitate a better understanding of complex microbial community networks that commonly occur in nature.This will allow us to determine factors that are crucial for community assembly under different environmental conditions and pave the way for constructing synthetic communities for various biotechnological applications.Here,we summarize the current advances in the field of BFIs with an emphasis on agriculture.

关键词： Bacterial-fungal interactions biological control Synthetic communities Secondary metabolites

Importance of Wolbachia-mediated biocontrol to reduce dengue in Bangladesh and other dengue-endemic developing countries

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Biosafety and Health 2023年第2期5卷 69-77页

作者： Abdullah Al Noman Debashish Das Zinnatun Nesa Md.Tariquzzaman Fariha Sharzana Md.Rakibul Hasan Baizid Khoorshid Riaz Golam Sharower Mohammad Meshbahur Rahman Department of Genetic Engineering&Biotechnology Jashore University of Science and TechnologyJashore 7408Bangladesh Directorate General of Health Services Government of the People's Republic of Bangladesh Ministry of Health and Family WelfareDhaka 1212Bangladesh Center for Medical Biotechnology Government of the People's Republic of Bangladesh Ministry of Health and Family WelfareDhaka 1212Bangladesh Department of Public Health and Hospital Administration National Institute of Preventive and Social Medicine(NIPSOM)Dhaka 1212Bangladesh Department of Entomology National Institute of Preventive and Social Medicine(NIPSOM)Dhaka 1212Bangladesh Department of Biostatistics National Institute of Preventive and Social Medicine(NIPSOM)Dhaka 1212Bangladesh

Mosquito-borne diseases,particularly dengue and chikungunya have become global threats,infecting millions of people worldwide,including developing countries of Southeast Asia and Latin America.Bangladesh,like many other developing countries,is experiencing frequent dengue outbreaks.This article,therefore,critically discussed the current status of dengue disease,vector control approaches,and the need for Wolbachia-mediated intervention in Bangladesh and other dengue-endemic developing countries.In this narrative review study,rel-evant literature was searched from major databases and search engines such as PubMed,BanglaJol,World Health Organization(WHO)/European Centre for Disease Prevention and control(ECDC)and Google Scholar.Considering the selection criteria,our search strategies finally involved 55 related literature for further investigation.Findings showed that current vector control strategies could not render protection for an extended period,and the disease burden of arboviruses is increasing.The impoverished outbreak preparedness,urbanization,climate change,and less efficacy of existing control methods have made people susceptible to vector-borne diseases.Hence,Wolbachia,a naturally occurring endosymbiont of many mosquito species that can potentially limit virus transmission through several host genetic alterations,would be a potential alterna-tive for dengue prevention.We also critically discussed the challenges and prospects of Wolbachia-based den-gue control in developing countries.The evidence supporting the efficacy and safety of this intervention and its mechanism have also been elucidated.Empirical evidence suggests that this introgression method could be an eco-friendly and long-lasting dengue control method.This review would help the policymakers and health experts devise a scheme of Wolbachia-based dengue control that can control mosquito-borne diseases,partic-ularly dengue in Bangladesh and other developing countries.

关键词： Wolbachia-based biocontrol Mosquitoes-borne diseases Dengue biological control Developing countries

Dynamics of additional food provided predator-prey system with habitat fragmentation

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International Journal of Biomathematics 2023年第4期16卷 45-80页

作者： K.Durga Prasad B.S.R.V.Prasad Department of Mathematical and Computational Sciences Sri Sathya Sai University for Human Ercellence Kamalapur KalaburagiKarnataka 585313India Department of Mathematics School of Advanced Sciences VIT(Deemed to be University)Vellore Tamilnadu 632014India

Due to human-caused deforestation,global warming,and other environmental factors,habitat fragmentation became widespread.This fragmentation has a variety of detrimental repercussions for many species as well as humans,especially in the agricultural economy.It causes insect outbreaks,the expansion of alien species,and disrupts biological management by rendering the habitat unsuitable for natural enemies in agriculture.Providing natural enemies with additional food is one method to improve the ecosystem and support them.In this study,we assumed that the ecosystem is separated into two patches and that predators can easily migrate from one patch to the next,while prey stays inside its patch's territory.We looked at the impact of offering more food to predators in a patchy environment using dynamical systems theory.The permanence,stability,and various bifurcations that occur in the system are studied using a rigorous mathematical analysis.The study looks at how predator's access to other food sources affects pest management.By adjusting the provided food's characteristic qualities,such as(nutritional)quality and quantity,one can limit and manage the pest in one or both patches,as well as eliminate predators from the ecosystem.This research reveals that providing predators with additional food(of specified quality and quantity)can help in controlling chaotic behavior in the system.The findings of the study are supported by numerical simulations.

关键词： Pest predator additional food habitat fragmentation Hopf bifurcation chaos biological control