Abstract
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.
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