microRNA(miPNA)是一类由内源基因编码的长度约21 ～25 nt的非编码小分子RNA.miRNA广泛分布于植物中,在植物生长发育的整个生活史中都有着重要的作用.文中主要介绍了植物miRNA的特点、生物合成、作用机制及其在植物发育中的作用.%MicroRNAs (miRNAs) are approximately 21-25 nucleotides (nt) long,small single strand non-coding RNAs which are encoded by endogenous genes.miRNAs are widely distributed in plants,and it plays an important role in plant growth and development throughout the life cycle.The characteristic,biosynthesis,function mechanisms and roles in plant growth and development of plant miRNA were reviewed.
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