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Designing and validation of specific primers for the quantitative detection of bacteria in sugarcane inoculant

  • Bacterial, Fungal and Virus Molecular Biology - Research Paper
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Abstract

Endophytic diazotrophic plant growth-promoting bacteria Herbaspirillum rubrisubalbicans (HCC103), Herbaspirillum seropedicae (HRC54), Paraburkholderia tropica (Ppe8T), Gluconacetobacter diazotrophicus (Pal5T), and Nitrospirillum amazonense (CBAmC) have been used as inoculants for sugarcane. The genome sequences of these strains were used to design a set of specific primers for the real-time PCR (qPCR) assay. Primer specificity was confirmed by conventional PCR using the genomic DNAs of 25 related bacterial species and the five target strains. The qPCR assays were conducted using root and shoot samples from two sugarcane varieties (RB867515 and RB92579). These samples were collected both with and without inoculation, using the target strains specified in this study. The sugarcane plants were grown in a greenhouse, utilizing a substrate composed of sterile sand and vermiculite in a 2:1 ratio, for a duration of 55 days. The primers designed for this study successfully amplified target DNA fragments from each of the bacterial species, enabling their differentiation at the species level. The total bacterial population present in the sugarcane quantified using qPCR was on average 105.2 cells g−1 of fresh tissue. Across both evaluated varieties, it was observed that the population of inoculated bacteria tended to decrease over time and became more concentrated in the sugarcane roots compared to the aerial parts. The qPCR results suggest that both the host and the microbes influence the endophytic population and the bacterial number decreases with plant age.

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Acknowledgements

To the Graduate Program in Crop Science (PPGF) of Federal Rural Rio de Janeiro University (UFRRJ), to Embrapa Agrobiologia, for its infrastructure and technical support; the Coordination for the Improvement of Higher Education Personnel (CAPES), for granting a scholarship to the first author and other collaborators. This work was partially funded by grants from the Carlos Chagas Research Support Foundation (FAPERJ) the National Council for Scientific Development (CNPq), project number INCT 46/33/2014-2 and

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  1. Instituto de Agronomia, Programa de Pós Graduação em Fitotecnia, Universidade Federal Rural Do Rio de Janeiro (UFRRJ), Km 07, BR 465, 23890-000, Seropédica, Rio de Janeiro, Brazil

    Cleudison Gabriel Nascimento Da Silva

  2. Instituto de Agronomia, Programa de Pós Graduação em Agronomia - Ciência Do Solo, UFRRJ, Km 07, BR 465, 23890-000, Seropédica, Rio de Janeiro, Brazil

    Edevaldo de Castro Monteiro & Priscila Pereira Diniz

  3. Instituto de Agronomia, Programa de Pós Graduação em Ciência, Tecnologia e Inovação Agropecuária, UFRRJ, Km 07, BR 465, 23890-000, Seropédica, Rio de Janeiro, Brazil

    Leonardo Araujo Terra

  4. Embrapa Agrobiologia, Km 07, BR 465, 23891-000, Seropédica, Rio de Janeiro, Brazil

    Stefan Schwab, Veronica Massena Reis, Jean Luiz Simoes-Araujo & Segundo Urquiaga

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Da Silva, C.G.N., Monteiro, E.d. ., Diniz, P.P. et al. Designing and validation of specific primers for the quantitative detection of bacteria in sugarcane inoculant. Braz J Microbiol 54, 2627–2640 (2023). https://doi.org/10.1007/s42770-023-01144-6

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