Distributions of differentially expressed miRNA target genes and their functional categories determined by GO analyses. The x axis represents categories of biological functions in different terms. The y axis is the percentage of genes involved in a certain function. The blue bars represent the percentage of input genes, targets of the differentially expressed miRNAs between inferior and superior spikelets with specific functions. The green bars represent the percentage of the control genomic genes that are involved in the specific function of the same category. If the percentage of the special functional category of input genes’ were higher or lower than that in the control genomic genes indicate this functional category may regulated by the differential expressed miRNA targets.