Fig. 2

Distribution of tissue specificity index, τ, of highly expressed genes in anther. Yanai’s tissue specificity index, τ, is 1 minus an average ratio of non-maximal tissue expression intensities to the maximal tissue expression intensity [23]. When τ is 1, the gene is expressed in only one tissue. When τ is 0, the gene expression intensities of all tissues are the same. a: scatter plots of Nipponbare τ and Minghui63 τ of highly expressed genes in Nipponbare or Minghui63 anther excluding global jiDE genes. Nipponbare τ and Minghui63 τ were calculated using 44 and 36 tissues, respectively (Additional file 2: Table S1 and Additional file 2: Figure S2). Red circles present changed-tissues jiDE genes. b: Percentages of changed-tissues (smooth line) and Minghui63 silent (broken line) jiDE genes among Nipponbare anther highly expressed genes in a 0.1 τ window are shown in the top panel, and a density plot of Nipponbare τ for the highly expressed genes in Nipponbare anther is shown in the bottom panel