Plant growth and microbiota structural effects of rhizobacteria inoculation on mahogany (Swietenia macrophylla King [Meliaceae]) under nursery conditions

Swietenia macrophylla is a tropical timber species of ecological and economic importance. However, its slow vegetative growth and root development in nurseries strongly limit its production. This study evaluated the effect of 10 rhizobacteria strains during the early stages of production of S. macrophylla. Superficially disinfected seeds were inoculated with rhizobacteria under commercial nursery conditions. Inoculation was complemented by initial fertilization without growth regulators, fungicides, or bactericides. The results indicate that the rhizobacteria strains induce different responses in plants. Significant differences in plant biomass and root architecture were found. Treatments inoculated with Bacillus sp., Bacillus polyfermenticus, and Bacillus siamensis strains; showed an increase of up to 41% (dry weight). Plants increased root biomass by 30% when inoculated with S. siamensis. All inoculated strains were identified as members of the genus Bacillus spp., and their presence three months after inoculation was assessed by 16S rRNA gene-based amplicon massive sequencing. We found that Bacillus sp. genus was only present in inoculated treatments, suggesting that inoculated bacteria could establish themselves successfully as part of the microbiota. These results support the advantages of using PGPRs in commercial tropical tree production.

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Bibliographic Details
Main Authors: Trujillo Elisea, Flor Itzel Maestra autora 20589, Labrín Sotomayor, Natalia Ysabel Maestra autora 21640, Becerra Lucio, Patricia Alejandra Maestra autora 21361, Becerra Lucio, Ángel Antonio Maestro autor 21929, Martínez Heredia, Jorge E. autor, Chávez Bárcenas, Ana T. autora, Peña Ramírez, Yuri Jorge Jesús Doctor autor 12328
Format: Texto biblioteca
Language:eng
Subjects:Swietenia macrophylla, Árboles maderables, Rizobacterias,
Online Access:https://doi.org/10.3390/f13101742
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