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MicroRNAs (miRNAs) are endogenous, short (~21-nucleotide), non-coding RNA molecules that play pivotal roles in plant growth, development, and stress response signaling. In this study using recently published draft genome sequence of a high-altitude plant maca (Lepidium meyenii Walp) and applying genome-wide computational-based approaches, a total of 62 potentially conserved miRNAs belonging to 28 families were identified and four (lme-miR160a, lme-miR164c, lme-miR 166a, and lme-miR 319a) of them further validated by RT-PCR. Deploying psRNATarget tool a total of 99 potential miRNA target transcripts were also identified in maca. Targets include a number of transcription factors like Squamosa promoter-binding, NAC, MYB, auxin response factor, APETALA, WRKY, and F-box protein. To the best of my knowledge, this is the first genome-based miRNA profiling of a high-altitude plant.

Identification and characterization of microRNAs and their targets in high-altitude stress-adaptive plant maca (Lepidium meyenii Walp)