MicroRNAs （ miRNAs ）, a group of highly conserved non-coding RNAs in eukaryotes, regulate target gene expression via multiple approaches of slicing target mRNA and inhibiting translation of target mRNA, i.e., regulations of target genes are achieved at posttranscriptional level. Therefore, they play important roles in plant organ morphogenesis, growth and development, signal transduction and abiotic stress response. One of the vital miRNA family is miR390, which is an ancient and highly conserved miRNA family ; its target gene, AGO7, is the b...
