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.

Comparative Enzyme Differentiation in Grass Roots. I. Acid Phosphatase

Charlotte J. Avers and Robert B. Grimm
American Journal of Botany
Vol. 46, No. 3 (Mar., 1959), pp. 190-193
Stable URL: http://www.jstor.org/stable/2439276
Page Count: 4
  • Read Online (Free)
  • Download ($12.00)
  • 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.
Comparative Enzyme Differentiation in Grass Roots. I. Acid Phosphatase
Preview not available

Abstract

There is a correlation between the pattern of acid phosphatase activity and the particular morphogenetic pattern in the root epidermis of festucoid and panicoid grasses. Four festucoid species all showed intensified enzyme activity in trichoblasts and loss of activity in hairless cell initials prior to the maturation of these cells. The 3 panicoid grasses showed no phosphatase-inactive cells during epidermal development. The festucoid epidermis contains alternating long and short cells which differentiate into hairless and hair cells respectively. The panicoid type shows no such cellular pattern and any epidermal cell seems capable of producing a root hair. Treatment of Phleum roots with 10-4 M coumarin caused a foreshortening of the growth zones and a concurrent apical shift in differential acid phosphatase activity. This response was interpreted as further evidence of a direct correlation between the morphogenetic and enzymatic differentiations in the root epidermis.

Page Thumbnails

  • Thumbnail: Page 
190
    190
  • Thumbnail: Page 
[191]
    [191]
  • Thumbnail: Page 
192
    192
  • Thumbnail: Page 
193
    193