Abstract
Maturation and germination of somatic embryos of hybrids A. alba Ă A. alba and A. alba Ă A. nordmanniana were followed by protein analysis of single embryogenic -suspensor masses (ESM) and analysis of storage protein accumulation during somatic embryo development. Very important step was one week pre-cultivation of ESM on medium with polyethylene glycol (PEG) and abscisic acid (ABA). Low osmotic potential of maturation medium and addition of ABA supported development of somatic embryo. Also partial drying of somatic embryo during following three weeks was needed for its normal development. In spite of morphologically fully developed, the somatic embryos were not physiologically ready for germination at least in terms of storage protein accumulation.
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