(a,b) Chao 1 (a) and observed OTUs (b) of the root microbiota of indica, japonica, and corresponding unplanted bulk soils in two fields. The numbers of replicated samples are as follows: in field I, indica (n = 201), japonica (n = 80), soil (n = 12); in field II, indica (n = 201), japonica (n = 81), soil (n = 12). Data in two locations show the consistent trend that the root microbiota of indica show higher alpha diversity than those of japonica. The horizontal bars within boxes represent median. The tops and bottoms of boxes represent 75th and 25th percentiles, respectively. The upper and lower whiskers extend to data no more than 1.5 × the interquartile range from the upper edge and lower edge of the box, respectively.