Abstract
Production of somatic embryos in suspension cultures ofDactylis glomerata L. (orchardgrass) was stimulated by the addition of various compounds containing reduced nitrogen to Schenk and Hildebrandt (SH) basal medium. Equimolar concentrations of combinations of proline and either serine or threonine supported embryogenesis, whereas, these amino acids individually did not promote embryogenesis. SH medium supplemented with 6 to 25 mM ammonium ion or Murashige-Skoog basal medium also supported embryo production. Ammonium ion did not act synergistically with either proline or serine to enhance embryogenesis. Embryos produced in media containing amino acid combinations were formed singly, did not exhibit secondary embryogenesis, and had significantly higher conversion rates compared to those formed in either SH medium supplemented with ammonium ion only or in combination with amino acids.
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