Abstract
Somatic embryos ofGnetum ula (Gnetum edule) an endangered gymnosperm closely related to the angiosperms have been induced in vitro. Megagametophyte tissue with immature embryos was cultured on Murashige and Skoog medium. A mucilaginous, translucent embryogenic callus was obtained with 5 mg/l BA. Callus induced with 2,4-D was non-embryogenic. The embryogenic callus in liquid half strength Murashige and Skoog medium without inorganic nitrates supplemented with 2.5 g/l casein hydrolysate and 0.5 g/l L-glutamine gave rise to immature embryos. The embryos matured when treated with 60 g/l sucrose and 10 mg/l abscisic acid.
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