Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Interphase and Preprophase Microtubule Organization in Some Polarized Cell Types of the Liverwort Marchantia paleacea Bert.

P. Apostolakos and B. Galatis
The New Phytologist
Vol. 124, No. 3 (Jul., 1993), pp. 409-421
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/2558119
Page Count: 13
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Interphase and Preprophase Microtubule Organization in Some Polarized Cell Types of the Liverwort Marchantia paleacea Bert.
Preview not available

Abstract

The organization of interphase and preprophase-prophase microtubules was studied in photosynthetic filament mother cells (PFMCs), photosynthetic filament cells (PFCs), mucilage papilla mother cells (MPMCs) and mucilage papillae (MP) of Marchantia paleacea Bert. These cell types exhibit polarized growth resulting, (a) in the formation of cell outgrowths followed by asymmetrical division (PFMCs and MPMCs), or (b) in the development of a tubular cell shape (PFCs and MP). The above cell types display an interphase cortical microtubule ring perpendicular to the axis of growth. In PFMCs and MPMCs it resides at the base of the cell outgrowth, while in PFCs and MP it has a median location. This microtubule ring is involved in the deposition of transverse, circumferentially aligned, cellulose microfibrils, defines the site where cell protrusion formation occurs and affects cell morphogenesis. In differentiated MP microtubules are rearranged in longitudinal or oblique cortical arrays. PFCs and MP also contain a prominent system of endoplasmic microtubules which may be involved in cytoplasmic polarization. In PFMCs, PFCs and MPMCs the interphase microtubule ring seems to function as a preprophase microtubule band (PPB). In the asymmetrically dividing PFMCs and MPMCs the PPB is complete but in symmetrically dividing PFCs it may be interrupted. The cell plate meets the parent wall at sites adjacent to the PPB cortical zone. These observations reveal further peculiarities in cortical microtubule organization and particularly in the PPBs of M. paleacea. Possible factors underlying the formation of complete or interrupted PPBs are discussed.

Page Thumbnails

  • Thumbnail: Page 
[409]
    [409]
  • Thumbnail: Page 
410
    410
  • Thumbnail: Page 
411
    411
  • Thumbnail: Page 
412
    412
  • Thumbnail: Page 
413
    413
  • Thumbnail: Page 
414
    414
  • Thumbnail: Page 
415
    415
  • Thumbnail: Page 
416
    416
  • Thumbnail: Page 
417
    417
  • Thumbnail: Page 
418
    418
  • Thumbnail: Page 
419
    419
  • Thumbnail: Page 
420
    420
  • Thumbnail: Page 
421
    421