The roles of microRNAs in regulating root formation and growth in plants
Xiao-xiao YAN | Xiang-yang LIU | Hong CUI | Ming-qin ZHAO
MicroRNAs (miRNAs) are small (ca. 20–24 nucleotides) non-coding RNAs that have recently been recognized as key post-transcriptional modulators of gene expression; and they are involved in many biological processes in plants, such as root growth and development. The miRNAs regulate root elongation, lateral root (LR) formation and adventitious root (AR) development in response to hormone signaling, nutrient uptake and biotic/abiotic stress. This review provides multiple perspectives on the involvement of miRNAs in regulating root growth and development in plants. We also discuss several crucial mechanisms of miRNAs, their relationships with transcription factors and the target gene-mediated hormone signaling interactions in the regulation of root growth and development.
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