• V Murugan

      Articles written in Proceedings – Plant Sciences

    • Organographic distribution, structure and ontogeny of laticifers inPlumeria alba Linn.

      V Murugan J A Inamdar

      More Details Abstract Fulltext PDF

      The organographic distribution, structure and ontogeny of non-articulated laticifers are studied inPlumeria alba. The distribution of laticifer branches is studied in stem, pedicel, petiole, lamina, petal, stamen, ovary, wall, style and stigma. Laticifer branches are observed in all except anther lobes and stigma. The wall of the laticifers is thicker than in the other cells and the cytoplasm contains many nuclei. Round starch grains were found in the neighbouring parenchyma cells, but starch grains are lacking in the laticifers. The laticifer branch can occur on either side of procambium of the shoot and these cells can easily be distinguished from other cells by larger size, prominent nuclei and denser cytoplasm. Laticifers grow intrusively along the intercellular spaces.

    • Optical microscopic studies on the structure and secretion of resin glands in some Apocynaceae

      R B Subramanian V Murugan J S S Mohan J A Inamdar

      More Details Abstract Fulltext PDF

      In some Apocynaceae a group of 10–15 resin glands is present as finger-like projections on the adaxial side of the proximal end of the petioles and sepals or petals. They originate from a group of epidermal and sub-epidermal cells. At maturity the glands are differentiated into a short stalk and a clavate head. The latter is composed of epidermal secretory cells and sub-epidermal parenchyma. Structurally and ontogenetically the resin glands resemble extrafloral nectaries and the standard colleters of the Rubiaceae. However, histochemical tests for lipophilic substances revealed that these glands secrete resin. The pale yellow, viscous secretion is released by cuticular bursting and covers the tender shoot apices and developing buds. The position and the secretory activity of the resin glands in relation to their function is discussed.

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