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Radioautographic visualization of incorporation of lipid precursors into anthers of muscari comosum


, : Radioautographic visualization of incorporation of lipid precursors into anthers of muscari comosum. Acta Societatis Botanicorum Poloniae 46(2): 295-302

Incorporation of the following lipid precursors: DL-mevalonic acid-2 3H, 3H palmitic acid and acetic acid-3H sodium salt, into the anther cells of M. comosum (L.) Mill. was investigated. These lipid precursors were demonstrated to incorporate into pollen mother cells, pollen grains and the tapetum at consecutive developmental stages. All used isotopes are incorporated into the cytoplasm of these cells and in the case of pollen grain the radioactivity of pollen grain wall (mainly composed of sporopellenin) is noticed. The highest radioactivity of pollen grain wall is observed after acetic acid, the lower one after palmitic acid, whereas the lowest uptake of lipid precursor occurs after mevalonic acid. In comparison with tetrad stage the distinct increase of the cytoplasmic radioactivity of tapetum, which appears to accompany the labeling of pollen grain wall, seems to indicate the participation of tapetum in the formation of exine. A possible role of Ubisch bodies in the formation of pollen grain wall is discussed.

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