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Streptomyces spp. Biofilmed Solid Inoculant Improves Microbial Survival and Plant-Growth Efficiency of Triticum aestivum

2022; Multidisciplinary Digital Publishing Institute; Volume: 12; Issue: 22 Linguagem: Inglês

10.3390/app122211425

2076-3417

Karla Gabriela Domínguez-González, J. Jesús Robledo-Medrano, Juan José Valdez-Alarcón, Orlando Hernández‐Cristóbal, Héctor Eduardo Martínez‐Flores, Jorge F. Cerna-Cortés, Ma. Guadalupe Garnica‐Romo, Raúl Cortés‐Martínez,

Mycorrhizal Fungi and Plant Interactions

Streptomyces species have been successfully used in diverse biotechnological processes; however, little is known about actinobacterial biofilm formation and its use as a biofilmed inoculant. The present study assessed and compared the ability of some plant growth-promoting actinobacterial strains to form biofilms on a carrier to improve microbial survival and colonize the rhizosphere and roots of Triticum aestivum, resulting in positive interactions and benefits to the plant. Forty-one actinobacterial isolates from Persea americana organic rhizosphere farms were tested on plant growth and biofilm-forming capacities, showing their potential use as bio-fertilizers in agriculture. Three Streptomyces strains were selected and tested for biofilm formation and plant growth-promoting (PGP) features. Biofilms were induced on the perlite carrier and used to inoculate seven treatments with T. aestivum in pot essays, resulting in a >200% increase in root weight and a >400% increase in total biomass. Endophytic colonization was achieved in all the treatments. Microbial survival ranged between 108 and 109 CFU/g after 12 weeks of treatment, indicating actinobacterial permanence on the carrier. Successful consortia formation was observed for mixed-strain treatments, suggesting long-term plant recolonization.