In recalcitrant seeds of horse chestnut (Aesculus hippocastanum L.), the bulk of protein in axial organs and cotyledons is accounted for by water-soluble proteins (albumins). In the cells of embryo, proteins are predominantly located in the cytosol, whereas the fraction of cell structures precipitate in the range from 1000 to 20000 g, accounting for only an insignificant part of total protein. Among the proteins of this fraction, there were no major components that could play a role of storage proteins. The aim of this work was to study deposition of protein in the vacuoles of cells of recalcitrant seeds of horse chestnut. Light microscopy and specific staining of protein and phytin did not detect protein bodies in the vacuoles of axial organs and cotyledons. Electron microscopy revealed traces of phytin in the vacuoles, but there were no formed globoids or considerable amount of protein therein. It is possible that precisely the absence of typical storage proteins and genetically determined desiccation in the course of maturation of recalcitrant seeds of horse chestnut stipulated preservation of the vacuoles that in mature recalcitrant seeds were not transformed into protein bodies.
Russian Journal of Plant Physiology – Springer Journals
Published: Jun 24, 2016
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