Co-inoculation of Bradyrhizobium stimulates the symbiosis efficiency of Rhizobium with common bean

Multiple Effect of Different Plant Growth Promoting Microorganisms on Beans (Phaseolus vulgaris L.) Crop

“…This may indicate that soil fauna in field conditions influenced the treatments. Similar results were reports by [28] who found less prominent response in non-sterile soil as a result of possible interactions with other soil microorganisms. The same was observed for the yield components, that presented higher variation in field conditions reflecting the greater environmental variation.…”

“…In the field experiment, at R6, all treatments that received PGPR inoculation were statistically equal to each other for SDW, however, IR, IRT, IRBu and IRTBa treatments were statistically higher compared to uninoculated treatment (NI), showing that inoculation with PGPR improves beans' biomass accumulation. The authors [28] found similar responses with common bean in non-sterile soil: shoot biomass increased with co-inoculation with R. tropici CIAT 899 + B. elkanii 29w when compared to plants inoculated only with R. tropici CIAT 899. However, co-inoculated plants did not differ statistically from the control, inoculated with R. tropici alone, which also happened in our study.…”

“…However, the treatment that received inoculation only allowed a production of shoot dry weight equivalent to fertilized treatment, demonstrating that inoculation with rhizobium is equivalent to nitrogen fertilizer, however, with lower production cost. Other study [28] found results in SDW parameter: the control fertilized with mineral N was statistically higher than the treatment inoculated with R. tropici CIAT 899.…”

“…In addition, these authors found an abundance of A. brasilense within intercellular spaces of commom beans fibrous stem pith cells using confocal microscopy. In addition, [28] found Bradyrhizobium elkanii colonization in intracellular spaces of bean nodules, while colonization by R. tropici CIAT 899 was intracellular.…”

Microbial inoculants: reviewing the past, discussing the present and previewing an outstanding future for the use of beneficial bacteria in agriculture

“…Improvements in yields have also been reported with the co-inoculation of rhizobia presenting different mechanisms of action. For example, Jesus et al (2018) verified benefits by the co-inoculation of common bean with R. tropici CIAT 899, Bradyrhizobium diazoefficiens USDA 110 and Bradyrhizobium elkanii 29w; according to the authors, Bradyrhizobium spp. would improve the symbiosis efficiency of Rhizobium , resulting in greater number of nodules, biomass production and N accumulation.…”