Abstract

Immature embryos from Zea mays L. inbred line B73 were cultured on Murashige and Skoog (MS) medium containing 0.5 mg/1 2,4-dicholorophenoxyacetic acid (2,4-D) and 12% (w/v) sucrose. A compact white callus proliferated from the scutella. When this tissue was transfered to equivalent medium containing 2% (w/v) sucrose, a green organogenic tissue was selected from the compact callus. After over 2 years in culture, this tissue was still capable of regenerating plants. A sector of this tissue spontaneously became embryogenic. Embryogenic callus can be distinguished by its friability, rapid growth rate and its mucilaginous texture. Embryogenic callus and suspensions have been maintained for approx. 2 years. Plants from organogenic tissue and embryogenic callus have been grown to maturity.

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