Fig. 4From: Xander: employing a novel method for efficient gene-targeted metagenomic assemblyPrincipal component analysis of rhizosphere samples (n = 7 per crop). The OTU abundances at 95 % aa identity were corrected using the mean kmer coverage of each contig. The OTU data were then standardized using the Wisconsin square root normalization as implemented in R. Ellipses represent 1 standard deviation of the points from the centroid. C corn, M Miscanthus, S switchgrass. Left: nitrite reductase (nirK). Right: ribosomal protein L2 (rplB)Back to article page