Shoot apical meristem ontogenesis in vivo and in vitro

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As the Late Professor Ian Sussex stated in his review (Cell 56: 225, 1989), “The meristems make the plant”. Apical meristems (AMs) are the mother of all cells in plants. They are responsible for the formation of tissues and organs of the primary plant body. Without properly functioning AMs, land plants will not exist. Although recent advances have been made in our understanding of the formation, maintenance, and function of AMs during normal plant development, we still do not fully understand how they are initiated during embryogenesis. Tissue culture and micropropagation of plants are important approaches in commercial plant production. To be successful, AM formation is a must in the newly regenerated plants. Moreover, our understanding of AM initiation from