Abstract
Somatic embryogenesis represents a promising tool for mass propagation of elite genotypes of conifers. The efficiency of the technique strongly depends on cultivation conditions, with the exogenous saccharide supply being one of the most important factors. Different types and concentrations of saccharides have been empirically evaluated with respect to production of acceptable numbers and quality of somatic embryos for particular conifer species. Only a few recently published papers have focused on deeper studies of carbohydrate metabolism, enabling insight into the physiological background of the crucial effects of carbohydrates. Generally, saccharides are known to serve as carbon and energy sources, osmotic agents, stress protectants, and signal molecules in plants. This review collects and critically discusses the experimental data on exogenous saccharide supplies, resulting endogenous levels, and key enzyme activities obtained from the most thoroughly described genus Picea. In conclusion, it stresses the necessily to broaden the studies and consider the unltiple roles of saccharides during conifer somatic embryogenesis.
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