Figure 5.7.(a) Callus tissue; (b,c) shoots arising from callus (an example of organogenesis). See
color insert.
Figure 5.8.Somatic embryogenesis: (a) cluster of somatic embryos; (b) globular embryo; (c) embryo
becomes heart-shaped as it grows; (d) torpedo-shaped embryo is the next developmental stage; (e) the
embryo forms cotyledons as it begins to mature; (f) germinating embryo (courtesy of Wayne Parrott
and Benjamin Martin).
5.6. CULTURE TYPES AND THEIR USES 121