Differences between <i>de novo</i> generated and conserved miRNA genes in <i>O. sativa</i> and <i>A. thaliana</i>.

at-test. bNumber of pairing bases/hairpin length. cNumber of siRNAs encoded by miRNA precursor. dPercentage of miRNA precursor encoding more than one miRNA. ePercentage of miRNA genes located in coding gene regions. fAverage promoter (TATA box) and enhancer number of a miRNA gene. gSimple sequence repeats number adjacent to miRNA gene within 1 kb region. hMean of all gene expression intensity is 403.67 and 6.14 in O. sativa and A. thaliana respectively. iWatson-Crick pairing number of miRNA cleaving site (10 and 11 nucleotides) on miRNA/target duplex. jOrthologous number of miRNA gene in 14 plant species in miRbase. kmiRNA expression data, polymorphism site data and DNA methylation data only have A. thaliana data. lPre-miRNA polymorphic site number/pre-miRNA length. Polymorphic site density of the whole genome is 6.66%. mPre-miRNA DNA methylation site number/pre-miRNA length. Methylcytosine density of the whole genome is 0.98%. n1 kb upstream of pre-miRNA DNA methylation site number/1000.