Advertisement

The octant proembryo ofEpithema carnosum Benth.

  • D. Padmanabhan
Article
  • 7 Downloads

Abstract

The quadrant proembryo ofEpithema carnosum Benth. consists of a spherical mass of four cells of which two opposite ones appear trapezoid in cross-section and the rest triangular. The inner faces of the quadrants are straight partitions while the outer faces are curved and converge towards the polar furrow. The primary adjustment facet is a median strip of cell wall which separates the quadrants. A transverse division of the quadrants results in the formation of the octant proembryo. The transverse cell plates are laid down in planes of minimal area in accordance with Errera’s Law and at slightly varying levels so that not more than three partitions meet at one edge. Due to subsequent readjustment, four lateral furrows corresponding to four new transverse primary adjustment facets are formed. In addition, a hexagonal secondary adjustment facet is formed in the centre of the sphere and separating the octants. This is formed from a strip of original primary adjustment facet of the quadrant proembryo. The octants have five to nine faces after readjustments. The shapes of the octants are determined by both surface tension and growth.

Keywords

Soap Bubble Partition Wall Lower Tier Transverse Wall Spherical Mass 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Errera, L... “Sur une condition fundamentale d’equilibre des cellules vivantes,”Compt. Rend. Acad. Sci., Paris, 1886,103, 822.Google Scholar
  2. Matzke, E. B... “The three-dimensional shape of bubbles in foam—an analysis of the role of surface forces in three-dimensional cell shape determination,”Amer. J. Bot., 1948,33, 58–80.CrossRefGoogle Scholar
  3. Priestley, J. H... “The meristematic tissues of plants,”Biol. Rev., 1928,3, 1–20.CrossRefGoogle Scholar
  4. Swamy, B. G. L. and Padmanabhan, D. “The quadrant proembryo ofEpithema carnosum,”Proc. Indian Acad. Sci., 1961,53B, 166–72.Google Scholar
  5. Thompson, D’Arcy, W. ..On Growth and Form, 1942 (1952), 2nd Ed., Cambridge University Press.Google Scholar
  6. Tupper-Carey, R. M. and Priestley, J. H. “The cell wall in the radicle ofVicia faba and the shape of the meristematic cells,”New Phytol., 1924,23, 156–59.CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 1966

Authors and Affiliations

  • D. Padmanabhan
    • 1
  1. 1.University Botany LaboratoryMadras-5India

Personalised recommendations