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Carbohydrate status during somatic embryo maturation in Norway spruce

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Summary

The development of Norway spruce (Picea abies (L.) Karst.) somatic embryos on a maturation medium was accompanied by changes in nonstructural carbohydrate status. During embryo maturation, the content of total soluble sugars in the embryonal suspensor mass decreased and the partitioning between sucrose and hexoses changed considerably in favor of sucrose. Developing somatic embryos were mainly responsible for these changes. Osmotic stress caused by the presence of 3.75% polyethylene glycol (PEG) in the maturation medium (decrease in osmotic potential by 52.5 kPa) resulted in dramatic changes in the content of endogenous saccharides. There was a lower total carbohydrate content in the embryonal suspensor mass grown on the medium containing PEG in comparison with the untreated control. Isolated embryos from later stages of embryo development contained mainly sucrose with a small amount (20%) of fructose and nearly no glucose. A further increase in PEG concentration in the medium (7.5%; decrease in osmotic potential by 112.5 kPa compared to the maturation medium) led to a large increase in the total endogenous sugar content. This increase in sugars was a result of the enhanced content of sucrose, fructose, and glucose. The increased glucose content was in contrast to embryos grown on the medium with lower or no PEG content.

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Authors and Affiliations

  1. Department of Plant Physiology, Faculty of Science, Charles University, Viničná 5, 128 44, Prague 2, Czech Republic

    Helena Lipavská, Hana Svobodová, Jana Albrechtová & Lucie Kumstýřová

  2. Institute of Experimental Botany, Academy of Sciences of Czech Republic, Rozvojová 135, 162 05, Prague 6, Czech Republic

    Martin Vágner & Zuzana Vondráková

Authors
  1. Helena Lipavská
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  2. Hana Svobodová
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  3. Jana Albrechtová
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  4. Lucie Kumstýřová
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  5. Martin Vágner
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  6. Zuzana Vondráková
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Correspondence to Helena Lipavská.

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Lipavská, H., Svobodová, H., Albrechtová, J. et al. Carbohydrate status during somatic embryo maturation in Norway spruce. In Vitro Cell.Dev.Biol.-Plant 36, 260–267 (2000). https://doi.org/10.1007/s11627-000-0048-9

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  • DOI: https://doi.org/10.1007/s11627-000-0048-9

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