Abstract:

Abstract：MicroRNAs are 20 to 24 nt, small noncoding RNAs. Specificity is provided by base pairing of the miRNA to miRNA target sequence, leading to translational repression or degradation of mRNA. Three miRNA families (miR172, miR159/miR319 and miR156) involved in flowering time regulation has recently been reviewed. miR156 is a master regulator in the phase changing from vegetative phase to reproductive phase; miR172 is involved in the regulation of ?owering time and ?oral organ identity in Arabidopsis thaliana through regulation of expression of APETALA2 (AP2)-like genes. The over expression of miR319 and miR159 results in several developmental defects, included a delay in flowering. In addition, we demonstrate some other miRNAs related to floral development. Finally, some perspectives are discussed.