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Plant growth-promoting rhizobacteria(PGPR)and its mechanisms against plant diseases for sustainable agriculture and better productivity

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BIOCELL 2022年第8期46卷 1843-1859页

作者： PRANAB DUTTA GOMATHY MUTHUKRISHNAN SABARINATHAN KUTALINGAM GOPALASUBRAMAIAM RAJAKUMAR DHARMARAJ ANANTHI KARUPPAIAH karthiba loganathan KALAISELVI PERIYASAMY MARUMUGAM PILLAI GK UPAMANYA SARODEE BORUAH LIPA DEB ARTI KUMARI MADHUSMITA MAHANTA PUNABATI HEISNAM AK MISHRA School of Crop Protection Central Agricultural University(Imphal)UmiamIndia Department of Soil Science and Agricultural Chemistry Agricultural College and Research InstituteTamil Nadu Agricultural UniversityKoyingbatoreIndia Department of Crop physiology Agricultural College and Research InstituteTamil Nadu Agricultural UniversityKoyingbatoreIndia Departments of Pulses Tamil Nadu Agricultural UniversityCoimbatoreKoyingbatoreIndia Department of Environmental Sciences Horticultural College and Research InstituteTamil Nadu Agricultural UniversityKoyingbatoreIndia Department of Plant pathology Assam Agricultural UniversityDhubriIndia KVK-Tinsukia Assam Agricultural UniversityTinsukiaIndia Department of Plant Pathology Central Agricultural University(Imphal)PasighatIndia Department of Plant Pathology Dr Rajendra Prasad Central Agricultural UniversityBiharIndia

Plant growth-promoting rhizobacteria(PGPR)are specialized bacterial communities inhabiting the root rhizosphere and the secretion of root exudates helps to,regulate the microbial dynamics and their interactions with the *** bacteria viz.,Agrobacterium,Arthobacter,Azospirillum,Bacillus,Burkholderia,Flavobacterium,Pseudomonas,Rhizobium,etc.,play important role in plant growth *** addition,such symbiotic associations of PGPRs in the rhizospheric region also confer protection against several diseases caused by bacterial,fungal and viral *** biocontrol mechanism utilized by PGPR includes direct and indirect mechanisms direct PGPR mechanisms include the production of antibiotic,siderophore,and hydrolytic enzymes,competition for space and nutrients,and quorum sensing whereas,indirect mechanisms include rhizomicrobiome regulation *** of root exudates,phytostimulation through the release of phytohormones viz.,auxin,cytokinin,gibberellic acid,1-aminocyclopropane-1-carboxylate and induction of systemic resistance through expression of antioxidant defense enzymes viz.,phenylalanine ammonia lyase(PAL),peroxidase(PO),polyphenyloxidases(PPO),superoxide dismutase(SOD),chitinase andβ-*** the suppression of plant diseases potent bio inoculants can be developed by modulating the rhizomicrobiome through rhizospheric *** addition,understandings of different strategies to improve PGPR strains,their competence,colonization efficiency,persistence and its future implications should also be taken into consideration.

关键词： Plant growth-promoting rhizobacteria Biocontrol Plant diseases PGPR mechanisms Sustainable agriculture

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Fungal Microbes Associated with Agarwood Formation

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American Journal of Plant Sciences 2016年第10期7卷 1445-1452页

作者： Muthuraj Sangareswari@Nagajothi Kalappan Thangamuthu Parthiban Subramani Umesh Kanna loganathan karthiba Duraisamy Saravanakumar Forest College and Research Institute Tamil Nadu Agricultural University Mettupalayam India Department of Food Production Faculty of Food and Agriculture The University of the West Indies St. Augustine Trinidad and Tobago

Agarwood is studied as the resinous secondary metabolites produced by the natural microbial infection. The current study investigated the range of microbial infection in agarwood trees collected from various parts of India. A total of 17 isolates were collected and identified based on the morphological and molecular studies. The study revealed that the agarwood was naturally infected with Aspergillus, Lasiodiploidia, Chaetomium, Fusarium and Penicillium species. Further studies on enzyme activities involved in the pathogenesis process showed the higher cellulase, ligninolytic and laccase activities in Aspergillus isolate AR13 when compared to other isolates. The current study has offered a potential opportunity to further strengthen the research on possible development of microbial strains for artificial inoculation in agar trees to induce agarwood formation.

关键词： Agarwood Aspergillus Cellulase Laccase Fungi

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