Fig. 3 Histological characterization of somatic embryogenesis in
macaw palm (A. aculeata). a morphological appearance of zygotic
embryo containing primary callus on the edge of the distal region.
b Primary callus containing meristematic clusters on the periphery
(arrows) (callus distal region). c Nodular embryogenic callus composed
of meristematic cells (callus mesocotyl region). d Scanning
electron micrograph showing the appearance of embryogenic callus.
e Bicellular proembryo embryo with suspensor. f Proembryo showing
multicellular suspensor. g Globular embryo isolated among cells in the
central region of embryogenic callus. h Scanning electron micrograph