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The ultrastructural features of embryos were studied from mature dry and soaked seeds of the parasitic angiosperm Cuscuta japonica. Outer tangential walls in the protoderm cells were thickened and covered by a thin cuticle layer. These walls could play important roles in preventing water loss from the Cuscuta seedling surfaces after germination and in strengthening the surfaces against various environmental stresses. In the protoderm cells of soaked embryos, lipid materials were released into the thick outer walls through the fusion of lipid bodies with the plasma membrane. In the dry embryos were stored a large number of protein bodies with globoid crystals and lipid bodies. Numerous lipid bodies also were aligned under the plasma membrane. In both dry and soaked embryos, protein bodies were digested and transformed into small vacuoles. The degraded reserves of the lipid and protein bodies could then be mobilized to nourish subsequent germination and seedling growth. Proplastids in the soaked embryo cells contained a few thylakoids and electron-dense plastoglobuli, and crystallized phytoferritin. The phytoferritin, an iron-protein complex, would also be utilized in chloroplast development for autotrophic seedling growth.
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