Fine tuning of auxin signaling by miRNAs.

microRNAs (miRNAs) constitute a major class of endogenous non-coding regulatory small RNAs. They are present in a variety of organisms from algae to plants and play an important role in gene regulation. The miRNAs are involved in various biological processes, including differentiation, organ development, phase change, signaling, disease resistance and response to environmental stresses. This review provides a general background on the discovery, history, biogenesis and function of miRNAs. However, the focus is on the role for miRNA in controlling auxin signaling to regulate plant growth and development.