Induction, maintenance, differentiation and embryogenic capacity of callus obtained from immature embryos by culture on induction medium, proliferation medium, maturation medium and regeneration medium, respectively, were compared for two inbred lines of maize, i.e. A188 and A632. The callus of inbred line A188 was embryogenic and maintained embryogenic capacity for at least 1 year. Immature embryos of inbred line A632 formed callus that was not embryogenic. It only produced roots. When sucrose was replaced by sorbitol to induce or improve embryogenesis, again only A188 formed embryogenic callus. Subculture of this callus, however, allowed 4 week intervals in stead of 2 week intervals without loss of embryogenic capacity.
When A188 was pollinated with A632 pollen, embryogenic callus was obtained from cultured immature "F1" embryos, showing that embryogenic capacity was inherited, maternally. The callus did not differ from the embryogenic callus generated on selfed A188 embryos. When A632 was pollinated with A188 pollen, embryogenic callus was obtained too, showing that embryogenic capacity was also inherited paternally, though the embryogenic capacity diminished quickly, and the stability of the callus was lower than in the reciprocal cross.
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Bronsema, F., van Oostveen, W. & van Lammeren, A. Comparative analysis of callus formation and regeneration on cultured immature maize embryos of the inbred lines A188 and A632. Plant Cell, Tissue and Organ Culture 50, 57–65 (1997). https://doi.org/10.1023/A:1005802828004