Figure 2.2 A schematic representation of the sequential stages of somatic embryo Single cell development. Somatic embryos may develop from single cells or from a small group of lls. Repeated cell divisions lead to the Group of cells production of a group of cells that develop Into an organised structure known as a g lobular-stage embryo. Further Globular embryo development results in heart- and torpedo stage embryos, from which plants can be regenerated Zygotic embryos undergo a Heart-stage embryo fundamentally similar development through the globular (which is formed after the 16 cell stage), heart and torpedo stages SAM Polarity is established early in embryo ↓ cotyledons development. Signs of tissue differentiation become apparent at the globular stage and a pical meristems are apparent in heart-stage RAM embryos