Role of miRNAs in the cross-talk of phytohormone signaling pathways

Plants are sessile organisms which demands a subtle regulation to thrive in variable conditions. This regulation occurs by hormones and miRNAs. In this chapter we go through the concept of micro-RNA, nomenclature, and action mechanism, specifically plant miRNAs, and review the outstanding knowledge of those miRNA involving in phytohormones pathways. Relevant information is presented about each hormone biosynthesis factors, signaling and receptors. Thence, which miRNAs target those elements around each phytohormone, spawning the crosstalk among them. miRNAs involved in several hormones pathway receive deserved attention and are presented as key elements into the plant breeding research environment.