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Panicum  represents a large genus of many North American prairie grass species. These include switchgrass ( Panicum virgatum ), a biofuel crop candidate with wide geographic range, as well as  Panicum hallii , a close relative to switchgrass, which serves as a model system for the study of  Panicum  genetics due to its diploid genome and short growth cycles. For the advancement of switchgrass as a biofuel crop, it is essential to understand host microbiome interactions, which can be impacted by plant genetics and environmental factors inducing ecotype-specific phenotypic traits. We here compared rhizosphere and root endosphere bacterial communities of upland and lowland  P. virgatum  and  P. hallii  genotypes planted at two sites in Texas. Our analysis shows that sampling site predominantly contributed to bacterial community variance in the rhizosphere, however, impacted root endosphere bacterial communities much less. Instead we observed a relatively large core endophytic microbiome dominated by ubiquitously root-colonizing bacterial genera  Streptomyces ,  Pseudomonas , and  Bradyrhizobium . Endosphere communities displayed comparable diversity and conserved community structures across genotypes of both  Panicum  species. Functional insights into interactions between  P. hallii  and its root endophyte microbiome could hence inform testable hypotheses that are relevant for the improvement of switchgrass as a biofuel crop.

Conservation of Endophyte Bacterial Community Structure Across Two Panicum Grass Species