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Regeneration of somatic embryos from in vitro-cultured NEP leaves of the EMB-2 clone of the interspecific hybrid Helianthus annuus × H. tuberosus. Somatic embryos on the adaxial surface of NEP explants cultured for 9 d (A) and/or 14 d (B) on MS (Murashige and Skoog, 1962) basal medium. Arrows in (A) indicates globular somatic embryos. Scale bars: (A) = 1·7 mm; (B) = 1·2 mm.
