Abstract
Background and aims
In this work we present the development of an easy and feasible in vivo alternative to identify promising Plant Growth Promoting Bacteria (PGPB), using wheat -as a model plant- growing under variable soil and climate conditions.
Methods
The identification of promising strains was carried out by Plant-Assistant Selection (PAS) (compared with the conventional PGPB selection, named in this work as Metabolic Traits Selection or MTS). We validated the ability of the obtained strains by PAS to promote wheat growth, by analyzing biometric and nutrimental parameters, as well as the relative expressions of NRT1.4, GluTR, and 6-SFT1 genes.
Results
Twenty strains were obtained by PAS (170 bacterial strains were originally co-inoculated to plants), of which, twelve strains showed the ability to promote wheat growth mainly by the stem development and the number of leaves. Moreover, thirteen strains up-regulated the 6-SFT1 gene, and three strains up-regulated the GluTR gen. Thus, the strains Enterobacter cloacae TS3, Microbacterium foliorum TS9, Bacillus cereus TS10, Paenibacillus lautus TE8, and Paenibacillus lautus TE10 were identified as promising PGPB, showing strong wheat growth promotion events compared with those strains obtained by MTS.
Conclusions
PAS is an easy and feasible alternative for identification of PGPB. However, ecological and economic factors need to be investigated to use the obtained strains by PAS for commercial microbial inoculants formulations.
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Abbreviations
- 16S rRNA:
-
16S ribosomal RNA
- 18S rRNA:
-
18S ribosomal RNA
- 6-SFT1:
-
Suc:fructan 6-fructosyltransferase
- CFU:
-
Colony forming units
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- GluTR:
-
Glutamyl-tRNA reductase 1
- MTS:
-
Metabolic Traits Selection
- NRT1.4:
-
Nitrate transporter 1.4
- PAS:
-
Plant-Assistant Selection
- PGPB:
-
Plant Growth Promoting Bacteria
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Acknowledgements
The authors acknowledge support by the Cátedras CONACyT Program through Project 1774 “Alternativas agrobiotecnológicas para incrementar la competitividad del cultivo de trigo en el Valle del Yaqui: desde su ecología microbiana hasta su adaptabilidad al cambio climático”; CONACyT Project 253663 “Fortalecimiento de la infraestructura del Laboratorio de Biotecnología del Recurso Microbiano del ITSON para la creación de COLMENA: COLección de Microrganismos Edáficos y Endófitos NAtivos, para contribuir a la seguridad alimentaria regional y nacional”; and CONACyT Project 257246 “Interacción trigo x microorganismos promotores del crecimiento vegetal: identificando genes con potencial agro-biotecnológico”, and scholarship 703393 (Brenda Valenzuela Aragon).
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Valenzuela-Aragon, B., Parra-Cota, F.I., Santoyo, G. et al. Plant-assisted selection: a promising alternative for in vivo identification of wheat (Triticum turgidum L. subsp. Durum) growth promoting bacteria. Plant Soil 435, 367–384 (2019). https://doi.org/10.1007/s11104-018-03901-1
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DOI: https://doi.org/10.1007/s11104-018-03901-1