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      Permanent link:
      https://www.ias.ac.in/article/fulltext/plnt/087/08/0205-0214

    • Keywords

       

      Embryology; Bursaria spinosa ; Pittosporaceae

    • Abstract

       

      Life history ofBursaria spinosa Cav., has been studied. The male archesporium is a plate of 3-cells. The anther wall comprises the epidermis, endothecium with banded thickenings, a middle layer and secretory tapetum. The tapetal cells are two to many nucleate and some of them become vesicular with 2–5 nuclei. Cytokinesis takes place by furrowing. The pollen grains are shed at the 3-celled stage. The ovule is ana-campylotrapous, unitegmic and tenuinucellate. Embryo sac develops according to the polygonum type. Fertilization is porogamous. The endosperm is nuclear to start with but becomes cellular in later stages. The embryogeny has been described for the first time and it conforms to the asterad type and keys out to the geum variation. A single instance of suspensor polyembryony has been noticed. The seed is endospermic. The seed coat is 2–3 layered. The pericarp consists of 3–4 layers of thin walled cells followed by 3–4 layers of sclerotic cells.

    • Author Affiliations

       

      L L Narayana1 K T Sundari1

      1. Department of Botany, Kakatiya University, Vidyaranyapuri, Warangal 506 009
    • Dates

       
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