An acidic silver staining method for synaptonemal complexes under light microscopy

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Abstract
A simple method is presented by which synaptonemal complexes (SC) can be visualized under bright field microscopy. Staining was accomplished with a silver nitrate solution adjusted to pH 3-3.5 with formic acid, after an acidic fixation. This method is suitable for the demonstration of SC, centromeres and NOR regions in both mammalian (Rattus norvegicus, Wistar) and orthopteran spermatocytes (Steropleurus martorelli complex). Pretreatment with solutions of alkaline pH are not needed for demonstrating SC, and the Ag impregnation may also operate when the proteinaceous lateral elements of the SC are subjected to low pH conditions. Different staining of the X chromosome during meiosis in Orthoptera, and a core-like structure in the chromosomes during the more condensed stages of meiosis and mitosis can also be shown.