Plant cell and tissue culture techniques are based on the unique abili
ty of plant cells to regenerate whole plants from in vitro cultured mu
lticellular explants or even single cells. In cereales regeneration vi
a embryogenesis is possible using somatic cells, immature pollen grain
s and in vitro cultured zygotes. Today, some of these techniques are a
lready integrated in breeding programs e.g. haploid production or muta
nt selection. Furthermore, they offer the possibility to expand the av
ailable pool for gene selection by the use of techniques in cell and m
olecular biology.