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Antimicrobial Activities of Extracts of Macrosphyra longistyla against Gram-Positive Oral Biofilm-Formers from School Children in Southwestern Nigeria and Toxicity Studies Using Brine Shrimps

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Advances in Microbiology 2024年第3期14卷 163-174页

作者： Chukwuemeka Emmanuel Nwankwo Onikepe Folarin Adeleke Osho Department of Biological Sciences Faculty of Natural Sciences Redeemer’s University Ede Nigeria African centre of Excellence for Genomics of Infectious Diseases (ACEGID) Redeemer’s University Ede Nigeria

The world will benefit from more effective antimicrobial agents against oral conditions arising from the actions of biofilm forming bacteria. Also, information is lacking on the oral biofilm-forming bacterial diversity in Southwestern Nigeria. In this study, we isolate and characterize oral biofilm producing bacteria in the oral cavities of schoolchildren in Southwestern Nigeria. We also investigate the antimicrobial properties of Macrosphyra longistyla extracts against the biofilm-formers and the toxicity of potent extracts. Samples were obtained from 109 schoolchildren aged 4 - 14 years from Lagos, Oyo and Osun States. Agar well diffusion technique was used in the antimicrobial susceptibility testing. Toxicity testing was done using brine shrimps (Artemia salina). Biofilm-formers in this study are Klebsiella sp., Streptococcus sp., Staphylococcus sp., and Micrococcus sp. Ethanol leaf extracts had the highest activity against all biofilm-producing bacteria. Ethanol stem bark extract, which elicited activity against Klebsiella only, was found to be less toxic than the ethanol leaf extract. Staphylococcus showed >10 mm susceptibility to the ethanol and aqueous extracts of Macrosphyra longistyla. Streptococcus and Micrococcus were susceptible to the antimicrobial actions of the ethanolic leaf extracts. Although the ethanol extracts of the leaves had lower minimum inhibitory concentrations than the ethanol extracts of the stem bark, toxicity studies showed ethanol extracts of the stem-bark to be more toxic than the ethanol extracts of the leaves. In conclusion, ethanolic extracts of Macrosphyra longistyla show potential as sources of antimicrobials against gram-positive, oral biofilm-forming bacteria.

关键词： Biofilms plant Extracts Toxicity Bacteria Susceptibility Antimicrobial

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Larvicidal potential of selected indigenous lichens against three mosquito species–Culex quinquefasciatus, Aedes aegypti and Anopheles stephensi

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Chinese Herbal Medicines 2018年第2期10卷 152-156页

作者： Syed Zameer Ahmed Khader Sidhra Syed Zameer Ahmed Kisore Perundurai Venkatesh Kamaraj Chinnaperumal Sanjeeva Nayaka Department of Biotechnology K.S.Rangasamy College of Technology Department of Biotechnology Periyar University Indian Lichenological Society Lichenology Laboratory Plant Diversity Systematics and Herbarium Division CSIR-National Botanical Research Institute (Govt. of India)

Objective：Mosquitoes are the major transmitting vectors of serious human diseases,causing millions of deaths every year with undesirable effects,including toxicity to non-target *** plants with insecticidal properties have been used in recent years for the control of a variety of pest insects and *** the quest for alternative natural biological control agents against mosquito larvae lichens were ***：Larvicidal activity was assessed with methanolic extracts of Parmotrema reticulatum,Parmotrema kamatti,Parmotrema tinctorum,Parmelia erumpens,Leptogium papilosum,and Roccella montagnei against Aedes aegypti,Anopheles stephensi,and Culex *** standard WHO protocols with minor modifications were adopted and the bioassay was evaluated at the concentrations of 100–500μg/m L for each *** all the lichen extracts showed complete mortality against *** in100μg/m L,the concentrations were decreased to 100,50,25,12.5,and 6.25μg/m L for *** mortality was observed for 24 h after ***：All the lichen extracts exhibited activity against third instar larvae of *** and *** at 100μg/m L,and 100%mortality was observed against the vector *** at 100μg/m *** highest larvicidal activity was found with *** against ***（81.127μg/m L）and ***（89.10μg/m L）.Similarly,*** and *** when tested against *** with minimum concentration〈100μg/m L exhibited significant activity withof 5.32and 6.97μg/m ***：The bioassay results revealed larvicidal potential of lichens especially against *** with high mortality even at lower ***,lichens can be used as an ideal sustainable approach for the control of lymphatic filariasis caused by vector ***.

关键词： larvicidal lichen mortality mosquito vectors

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Genomic selection in plant breeding:Key factors shaping two decades of progress

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Molecular plant 2024年第4期17卷 552-578页

作者： Admas Alemu Johanna Astrand Osval A.Montesinos-López Julio Isidro y Sanchez Javier Fernandez-Gónzalez Wuletaw Tadesse Ramesh R.Vetukuri Anders S.Carlsson Alf Ceplitis JoséCrossa Rodomiro Ortiz Aakash Chawade Department of plant Breeding Swedish University of Agricultural SciencesAlnarpSweden Lantmannen Lantbruk SvalövSweden Facultad de Telematica University de ColimaColimaColima 28040Mexico Centro de Biotecnología y Genómica de plantas(CBGP UPM-INIA)Universidad Politécnica de Madrid(UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria(INIA)Campus de Montegancedo-UPM28223 MadridSpain International Center for Agricultural Research in the Dry Areas(ICARDA) RabatMorocco International Maize and Wheat Improvement Center(CIMMYT) Km 45Carretera México-VeracruzTexcocoMéxico 52640Mexico

Genomic selection,the application of genomic prediction(GP)models to select candidate individuals,has significantly advanced in the past two decades,effectively accelerating genetic gains in plant *** article provides a holistic overview of key factors that have influenced GP in plant breeding during this *** delved into the pivotal roles of training population size and genetic diversity,and their relationship with the breeding population,in determining GP *** emphasis was placed on optimizing training population *** explored its benefits and the associated diminishing returns beyond an optimum *** was done while considering the balance between resource allocation and maximizing prediction accuracy through current optimization *** density and distribution of single-nucleotide polymorphisms,level of linkage disequilibrium,genetic complexity,trait heritability,statistical machine-learning methods,and non-additive effects are the other vital *** wheat,maize,and potato as examples,we summarize the effect of these factors on the accuracy of GP for various *** search for high accuracy in GP—theoretically reaching one when using the Pearson’s correlation as a metric—is an active research area as yet far from optimal for various *** hypothesize that with ultra-high sizes of genotypic and phenotypic datasets,effective training population optimization methods and support from other omics approaches(transcriptomics,metabolomics and proteomics)coupled with deep-learning algorithms could overcome the boundaries of current limitations to achieve the highest possible prediction accuracy,making genomic selection an effective tool in plant breeding.

关键词： genomic selection genetic gain genomic prediction optimization deep learning training population optimization

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Contrasting plant growth performance of invasive polyploid and native diploid Prosopis is mediated by the soil bacterial community

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Ecological Processes 2023年第1期12卷 195-205页

作者： Rishabh Kaushik Meesha Sharma Ch.V.Ramana Ch.Sasikala Maharaj K.Pandit Jealott's Hill International Research centre Warfield Department of Environmental Studies University of Delhi Department of plant Sciences School of Life Sciences University of Hyderabad P.O.Central University Bacterial Discovery Laboratory Centre for Environment Institute of Science and Technology J.N.T.University Hyderabad Jindal School of Environment & Sustainability OP Jindal Global University

Background Soil microbial communities affect above-ground plant diversity and community composition by influencing plant growth performance. Several studies have tested the effect of soil bacterial microbiome on growth performance of native and invasive plants, but the influence of specific bacterial isolates has not been ***, we investigated the effects of soil bacterial exclusion by soil sterilization and by inoculation of Streptomyces rhizobacterial isolates on the growth performance of native and invasive Prosopis *** plant growth performance of invasive P. juliflora was significantly reduced when grown in sterilized soils,whereas native P. cineraria showed enhanced growth performance in the sterilized soils. When grown in the soil inoculated with the specific Streptomyces isolate from P. juliflora(PJ1), the growth performance of invasive P. juliflora was significantly enhanced while that of native P. cineraria seedlings was significantly reduced. However, inoculation of P. cineraria and P. juliflora seedlings with Streptomyces isolate from the rhizosphere of native P. cineraria(PC1) had no significant effect on the growth performances either of P. juliflora or P. *** Our study reveals that invasive P. juliflora experiences positive feedback from the non-native soil bacterial community, while the native P. cineraria experiences negative feedback from its soil bacterial community. Our results provide fresh experimental evidence for the enemy release hypothesis, and further our understanding of the contrasting growth-promoting effects of differentially recruited microbial species belonging to the same genus(Streptomyces)in the rhizospheres of alien invasive and native plants.

关键词： Soil bacteria Streptomyces Invasive Prosopis juliflora Prosopis cineraria Soil microbiota

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Molecular and morphological data confirmed the presence of the rare species Mattirolomyces terfezioides in China

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plant diversity 2017年第2期39卷 89-93页

作者： Xiaojin Wang Peigui Liu Lihua Sun Key Laboratory for plant diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 China Biological Sciences and Technology College Baotou Teachers' College Baotou 014030 China

Although the species Mattiwlomyces terfezioides(≡ Terfezia terfezioides) has been recorded from China several times but it is really rare taxon with important ecological and economic value,the conspecihcity with European material has never been tested by molecular *** re-examined three specimens labelled as ***,one as *** and one as Terfezia *** the herbarium HMAS and obtained five ITS and three LSU *** morphological observation and DNA sequences show that one specimen(HMAS 83766) labelled as *** turns out to be Choiromyces *** the other four are *** ITS and(or) LSU sequences of the Chinese samples are identical with or with 99%similarity to those from the European samples,which fully confirms the presence of *** in *** species is currently known from northern China(Hebei Province,Beijing and Shanxi Province).This study shows that M terfezioides has a Euroasia distribution other than European endemism and such distribution might be explained by the co-occurrence with the potential host tree Robinia pseudoacacia.

关键词： Black locust Desert truffle Pezizaceae Taxonomy

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Wild rice research: Advancing plant science and food security

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Molecular plant 2022年第4期15卷 563-565页

作者： Robert J.Henry Queensland Alliance for Agriculture and Food Innovation University of QueenslandBrisbaneQLD 4072Australia ARC centre of Excellence for plant Success in Nature and Agriculture University of QueenslandBrisbaneQLD 4072Australia

Rice was domesticated in Asia(Oryza sativa)and Africa(Oryza glaberrima)from Oryza rufipogon and Oryza bathii,*** Oryza genus has a pantropical *** genetic diversity in Oryza provides an extensive gene pool to adapt rice to climate change and address future food *** primary gene pool of domesticated rice includes species that are readily accessible for rice breeding due to ease of crossing,while more distant species are also sources of useful genes that can be recovered with greater difficulty(Figure 1).Advances in genomics and gene editing provide a path for use of this wider *** of Oryza species also offer potential insights into rice biology that may be critical for ongoing rice food security.

关键词： sativa Oryza breeding

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A New Record of Aspergillus vadensis (Ascomycota) Isolated from Soil in Yunnan Province,China

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Phyton-International Journal of Experimental Botany 2021年第3期90卷 1031-1039页

作者： Sadia Nadir Sehroon Khan Dhanushka N.Wanasinghe Saowaluck Tibpromma Shahid Iqbal Jianchu Xu Peter Mortimer CAS Key Laboratory for plant diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of ScienceKunming650201China centre for Mountain Futures Kunming Institute of BotanyKunming654400China Department of Chemistry University of Science and TechnologyBannu28100Pakistan

During a survey of soil fungi in Yunnan Province,several isolates of Aspergillus were *** on morphology and molecular analyses of internal transcribed spacer regions and intervening 5.8S nrRNA gene(ITS),β-tubulin and calmodulin(CaM)genes sequences,two isolates were identified as Aspergillus vadensis(section Nigri).A phylogenetic tree,detailed descriptions,illustrations and scanned electron microscopy morphology are provided for the new *** is the first record of *** from China.

关键词： Morphology phylogeny section Nigri soil fungi

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Current re-vegetation patterns and restoration issues in degraded geological phosphorus-rich mountain areas:A synthetic analysis of Central Yunnan, SW China

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plant diversity 2017年第3期39卷 140-148页

作者： Kai Yan Sailesh Ranjitkar Deli Zhai Yunju Li Jianchu Xu Bo Li Yang Lu Key Laboratory for plant diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of Sciences World Agroforestry Center ICRAF East and Central Asia The State Phosphorus Resource Development and Utilization Engineering Technology Research centre Yunnan Phosphate Chemical Group Co. Ltd College of Resource and Environment Yunnan Agricultural University

China has the largest area of inland geological phosphorus-rich(GPR) mountains in the world, where vegetation restoration is key to safeguarding the environment. We reviewed the published literature and collected new data in order to analyze re-vegetation patterns and the status of plant communities in central Yunnan. The aim of our analysis was to suggest future improvements to restoration strategies in GPR mountain regions. Our results showed that spontaneous recovery was the most widespread type of restoration. N-fixing species such as Coriaria nepalensis and Alnus nepalensis play a vital role in succession. In the past, monoculture tree plantation was the primary method used in afforestation activities in central Yunnan; in recent years however, several different methods of restoration have been introduced including the use of agroforestry systems. For practical restoration, we found that spontaneous recovery was capable of delivering the best results, but that during its early stages, restoration results were affected by several factors including erosion risk, the origin of propagates and environmental variation. In contrast, methods employing human-made communities performed better in their early stages, but were constrained by higher costs and vulnerability to degradation and erosion. The use of N-fixing species such as A. nepalensis and Acacia mearnsii in plantations were unsuccessful in restoring full ecosystem functions. The success of restoration activities in GPR mountain regions could be improved through the following measures:(1) developing a better understanding of the respective advantages and disadvantages of current natural and human-engineered restoration approaches;(2) elucidating the feedback mechanism between phosphorus-rich soil and species selected for restoration, especially N-fixing species;(3) introducing market incentives aimed at encouraging specific restoration activities such as agroforestry, and improving the industry value chain.

关键词： Systematic review Dianchi Lake Fuxian Lake Natural restoration Human engineered restoration Floristic similarity

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The rhizospheric microbiome becomes more diverse with maize domestication and genetic improvement

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Journal of Integrative Agriculture 2022年第4期21卷 1188-1202页

作者： HUANG Jun LI Yun-feng MA Yuan-ying LI Yan-sheng JIN Jian LIAN Teng-xiang Key Laboratory of plant Molecular Breeding of Guangdong Province College of AgricultureSouth China Agricultural UniversityGuangzhou 510640P.R.China centre for Mined Land Rehabilitation Sustainable Minerals InstituteThe University of QueenslandBrisbane Qld 4072Australia Key Laboratory of Mollisols Agroecology Northeast Institute of Geography and AgroecologyChinese Academy of SciencesHarbin 150081P.R.China Department of Animal Plant and Soil SciencesCentre for AgriBioscienceLa Trobe UniversityMelbourne CampusBundoora Vic 3086Australia

Domestication and genetic improvement of maize improve yield and stress tolerance due to changes in morphological and physiological properties, which likely alter rhizosphere microbial diversity. Understanding how the evolution of maize germplasm impacts its rhizobacterial traits during the growth stage is important for optimizing plant-microbe associations and obtaining yield gain in domesticated germplasms. In this study, a total of nine accessions representing domestication and subsequent genetic improvement were selected. We then sequenced the plant DNA and rhizobacterial DNA of teosinte, landraces and inbred lines at the seedling, flowering and maturity stages in a field trial. Moreover, the soil chemical properties were determined at the respective stages to explore the associations of soil characteristics with bacterial community structures. The results showed that domestication and genetic improvement increased the rhizobacterial diversity and substantially altered the rhizobacterial community composition. The core microbiome in the rhizosphere differed among germplasm groups. The co-occurrence network analysis demonstrated that the modularity in the bacterial network of the inbred lines was greater than those of teosinte and the landraces. In conclusion, the increased diversity of the rhizobacterial community with domestication and genetic improvement may improve maize resilience to biotic stresses and soil nutrient availability to plants.

关键词： teosinte landraces inbred lines domestication and improvement core microbiome network

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Polyketides with potential bioactivities from the mangrove‑derived fungus Talaromyces ***0362

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Marine Life Science & Technology 2023年第2期5卷 232-241页

作者： Huawei Lv Haibo Su Yaxin Xue Jia Jia Hongkai Bi Shoubao Wang Jinkun Zhang Mengdi Zhu Mahmoud Emam Hong Wang Kui Hong Xing-Nuo Li College of Pharmaceutical Science&Key Laboratory of Marine Fishery Resources Exploitment&Utilization of Zhejiang Province Zhejiang University of TechnologyHangzhou 310014China School of Pharmaceutical Sciences Wuhan UniversityWuhan 430072China Department of Pathogen Biology&Jiangsu Key Laboratory of Pathogen Biology Nanjing Medical UniversityNanjing 211166China Beijing Key Laboratory of Drug Target Research and New Drug Screening Institute of Materia MedicaChinese Academy of Medical SciencesBeijing 100700China Research Center of Analysis and Measurement Zhejiang University of TechnologyHangzhou 310014China Department of Phytochemistry and plant systematics National Research CentreGizaEgypt

Metabolites of microorganisms have long been considered as potential sources for drug *** this study,fve new depsidone derivatives,talaronins A-E(1-5)and three new xanthone derivatives,talaronins F-H(6-8),together with 16 known compounds(9-24),were isolated from the ethyl acetate extract of the mangrove-derived fungus Talaromyces species *** structures were elucidated by analysis of spectroscopic data and chemical methods including alkaline hydrolysis and Mosher’s *** 1 and 2 each attached a dimethyl acetal group at the aromatic ring.A putative biogenetic relationship of the isolated metabolites was presented and suggested that the depsidones and the xanthones probably had the same biosynthetic precursors such as chrysophanol or *** antimicrobial activity assay indicated that compounds 5,9,10,and 14 showed potent activity against Helicobacter pylori with minimum inhibitory concentration(MIC)values in the range of 2.42-36.04μmol/*** secalonic acid D(19)demonstrated signifcant antimicrobial activity against four strains of *** with MIC values in the range of 0.20 to 1.57μmol/***,secalonic acid D(19)exhibited cytotoxicity against cancer cell lines Bel-7402 and HCT-116 with IC_(50) values of 0.15 and 0.19μmol/L,*** structure–activity relationship of depsidone derivatives revealed that the presence of the lactone ring and the hydroxyl at C-10 was crucial to the antimicrobial activity against *** depsidone derivatives are promising leads to inhibit *** and provide an avenue for further development of novel antibiotics.

关键词： Mangrove-derived fungus Talaromyces sp. Depsidone Xanthone Antimicrobial

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