Fig. 5.

Key morphological characteristics of embryogenic callus structures that develop into suspensor-bearing embryos. a Table showing the number of tracked structures with the indicated initial morphological characteristics and their final cell fate. Cell morphology was defined at the start of the tracking period. Cultures were tracked for five days and then cultured without tracking for an additional four days, at which time the final cell fate was established. b–f Representative thin sections of the different callus morphologies. b–c Symmetric (b) or asymmetric (c) cell division plane. d-e Exine rupture perpendicular- (d) or parallel (e) to the division plane. f-g Limited (f) or extensive (g) loss of cell adhesion between two cells