• K R Shivanna

      Articles written in Proceedings – Plant Sciences

    • Recognition and rejection phenomena during pollen-pistil interaction

      K R Shivanna

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      In flowering plants, the pollen grain—the male gametophyte—interacts with the diploid sporophytic tissue of the pistil before liberating the male gametes in the vicinity of the female gamete. During this gametophyte-sporophyte interaction the male gametes are effectively screened by the pistil ensuring the entry of only the appropriate pollen tubes into the embryo sac. This review summarises recent investigations on pollen recognition and rejection, explains the current understanding, and projects future lines of study.

    • Seed germination, seedling growth and haustorial induction inSantalum album, a semi-root parasite

      Archna Sahai K R Shivanna

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      Seed germination and early growth of the seedling inSantalum album, a semi-root parasite, is independent of the host but seedling establishment seems to be dependent on the establishment of host contact. About half of the seedlings, raised in aseptic cultures, showed drying of the shoot tip upon transfer to fresh medium and subsequent development of a large number of adventitious shoot buds on the hypocotyl. Attempts to induce rooting in these shoot buds were unsuccessful. Gum tragacanth, which induces haustoria in two Scrophulariaceous root parasites, and xenognosin, the active fraction from gum tragacanth, were effective in inducing haustoria inS. album in the absence of the host.

    • Structure and cytochemistry of the pistil inArachis hypogaea

      K Venkata Lakshmi K R Shivanna

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      InArachis hypogaea (Papilionoideae, Leguminosae), the stigma is of the dry papillate type. The papillae are multicellular and multiseriate. They are covered with a thin lining of pellicle which responds for proteins, non-specific esterases and acid phosphatases. The style is 3–6 cm long and hollow throughout its length. The stylar canal is bordered by a layer of canal cells. The canal cells in most of the stylar region are not glandular, they are vacuolate with scant cytoplasm. The canal cells at the base of the style, however, are glandular with dense cytoplasm and prominent nuclei. The structural features of the pistil ofArachis are discussed with those of other Papilionoideae.

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