Abstract
Although inoculating soybean with rhizobia for biological nitrogen fixation is a common practice in agriculture, rhizobia are also known to associate with grasses. In this study, we evaluate the potential utility of the rhizobial strains SEMIA 587 and 5019 (Bradyrhizobium elkanii), 5079 (Bradyrhizobium japonicum), and 5080 (Bradyrhizobium diazoefficiens), recommended for Brazilian soybean inoculation, in colonizing black oat plants and promoting growth in black and white oats, and ryegrass. Inoculation of white oats with SEMIA 587 increase the seed germination (SG) by 32.09%, whereas the SG of black oats inoculated with SEMIA 587 and 5019 increased by 40.38% and 37.85%, respectively. Similarly, inoculation of ryegrass with all strains increased SG values between 24.63 and 27.59%. In addition, white oats with SEMIA 587 and 5080 had root areas significantly superior to those in other treatments, whereas inoculation with SEMIA 5079 and 5080 resulted in the highest volume of roots. Likewise, SEMIA 5079 and 5080 significantly increased the length, volume, and area of black oats roots, whereas SEMIA 587 increased the volume, area, and dry mass of roots and shoot. Inoculation in ryegrass with SEMIA 587 significantly increased the root volume. Moreover, most strains transformed with gfp and gus were observed to colonize the roots of black oats. Collectively, the findings of this study indicate that rhizobial strains recommended for inoculation of soybean can also be used to promote the growth of the three assessed grass species, and are able to colonize the roots of black oats.
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This work was financed by a grant and fellowships from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/Brazil).
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Material and methods preparation, and analysis were performed by Carolina Leal de Castilho, Camila Gazolla Volpiano, Lucas Zulpo, Adriana Ambrosini, and Anelise Beneduzi. Grant and fellowships acquisition were provided by Enílson Luiz Saccol de Sá, and Luciane Passaglia. The manuscript was written by Carolina Leal de Castilho, Enílson Luiz Saccol de Sá, and Anelise Beneduzi. All authors commented on previous versions of the manuscript, and approved the final manuscript.
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de Castilho, C.L., Volpiano, C.G., Ambrosini, A. et al. Growth-promoting effects of Bradyrhizobium soybean symbionts in black oats, white oats, and ryegrass. Braz J Microbiol 52, 1451–1460 (2021). https://doi.org/10.1007/s42770-021-00523-1
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DOI: https://doi.org/10.1007/s42770-021-00523-1