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Biofilmed-PGPR:Next-Generation Bioinoculant for Plant Growth Promotion in Rice under Changing Climate

Rice science 2025年第1期32卷 94-106,I0059,I0060页

作者： Jeberlin Prabina BRIGHT Hemant SMAHESHWARI Sugitha THANGAPPAN Kahkashan PERVEEN Najat ABUKHARI Debasis MITRA Riyaz SAYYED Andrea MASTINU Department of Soil Science and Agricultural Chemistry Agricultural College and Research InstituteTamil Nadu Agricultural UniversityKillikulam 628252India Indian Council of Agricultural Research(ICAR)-Indian Institute of Soybean Research Indore 452001India Karunya Institute of Technology and Sciences School of Agricultural SciencesKarunya NagarCoimbatore 641114India Department of Botany&Microbiology College of ScienceKing Saud UniversityRiyadh-11495Saudi Arabia Department of Microbiology Graphic Era(Deemed to be University)Clement TownDehradun 248002India Department of Biological Sciences and Chemistry College of Arts and ScienceUniversity of NizwaNizwa 616Sultanate of Oman Department of Molecular and Translational Medicine Division of PharmacologyUniversity of BresciaBrescia 25123Italy

The exopolysaccharide matrix of diazotrophic cyanobacteria was used to integrate phosphorus(P)and potassium(K)solubilizing bacteria,enhancing the survival of plant growth-promoting rhizobacteria,and ultimately the survival of bacteria in the rhizosphere for better plant growth.A new biofilm-based formulation comprising the diazotrophic cyanobacteria Anabaena AMP2,P-solubilizing Bacillus megaterium *** PB1,and K-solubilizing Rhizobium pusense KRBKKM1 was tested for efficacy in *** growth medium with half-strength BG-11 medium supplemented with 3%glucose showed best for biofilm formation under in vitro *** of the methanolic extract of the cyanobacterial-bacterial biofilm(CBB)showed the activity of antioxidants,such as 2-methoxy phenol and pentadecane,which are proven to improve plant-microbe interactions and plant growth,*** of rice seeds with CBB extract at 100 mL/kg or 200 mL/kg showed significant enhancement in germination rate and seedling ***,a pot culture experiment with the CBB formulations was carried out,and different growth and yield parameters were *** component analysis showed that plant growth,yield,soil dehydrogenase activity,and soil chlorophyll content were positively correlated with rice plants amended with vermiculite-based CBB at 2 kg/hm^(2) followed by a spray with aqueous CBB formulation at 5 mL/L at 15 and 30 d after rice transplanting grown with a 25%reduced level of nitrogen/phosphorus/potassium chemical fertilizers than the recommended ***,Pearson correlation analysis showed that yield was positively correlated with soil dehydrogenase(r=0.92**)and soil chlorophyll content(r=0.96**).We concluded that CBB could be used as a novel biofilm-based bio-inoculant to increase rice productivity and crop fitness as a component in integrated nutrient management and sustainable organic farming strategies with reduced chemical fertilizers.

关键词： cyanobacterial bacterial biofilm formulation rice volatile compound plant growth promotion reduced fertilizer level

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