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Endophytic diazotrophs detected in sugarcane roots by nifH gene analysis. (A) The relative abundances of the TOP 20 diazotrophs in four species of sugarcane at the genus level. (B) A Venn diagram of operational taxonomic units (OTUs) among three sugarcane species. (a) S. officinarum; (b) S. barberi; (d) commercial cultivars; (e) S. spontaneum.
