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.

Ultrastructure of Chloroplasts and Chromoplasts in Capsicum annuum. I. Thylakoid Membrane Changes During Fruit Ripening

Arthur R. Spurr and William M. Harris
American Journal of Botany
Vol. 55, No. 10 (Nov. - Dec., 1968), pp. 1210-1224
Stable URL: http://www.jstor.org/stable/2440743
Page Count: 15
  • 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.
Ultrastructure of Chloroplasts and Chromoplasts in Capsicum annuum. I. Thylakoid Membrane Changes During Fruit Ripening
Preview not available

Abstract

Developing chromoplasts in the fruit of Capsicum annuum were examined by electron microscopy. Special attention was given to changes in the thylakold system. All grana and some intergranal thylakoids in the mature chromoplasts of the seven cultivars studied underwent lysis. The particulate nature of the granal membranes disappeared during lysis before the relationship between the partitions and locales was obscured. The changes during lysis support the globular concept of membrane structure. The selective lysis of the synaptic membranes of the granal partitions may be attributed to their distinctive composition and structure. Lipid globules (osmiophilic) did not accumulate in the immediate region of granal lysis, indicating that they are not directly derived from membranes undergoing degradation. During and following granal lysis a profuse development of intergranal thylakoid membranes occurred in several cultivars. In some instances a thylakoid plexus (prolamellar body) was formed. This specialized structure of the thylakoid system occurs in the chromoplasts of other species as well as in other types of plastids. Extensive, concentrically arranged thylakoid sheets with specific interspaced membrane relationships were frequently associated with the plexus. Several types of membrane associations and interrelationships in the plastid are described. An analysis of one type of membrane configuration, the thylakoid sheets, indicated that one method of growth may be through intussusception into the original membrane. The development of thylakoid plexes and of extensive thylakoid Sheets during or after granal lysis indicates that dynamic synthetic activities occur in the chromoplasts of some cultivars of pepper during fruit ripening.

Page Thumbnails

  • Thumbnail: Page 
1210
    1210
  • Thumbnail: Page 
1211
    1211
  • Thumbnail: Page 
1212
    1212
  • Thumbnail: Page 
1213
    1213
  • Thumbnail: Page 
1214
    1214
  • Thumbnail: Page 
1215
    1215
  • Thumbnail: Page 
1216
    1216
  • Thumbnail: Page 
1217
    1217
  • Thumbnail: Page 
1218
    1218
  • Thumbnail: Page 
1219
    1219
  • Thumbnail: Page 
1220
    1220
  • Thumbnail: Page 
1221
    1221
  • Thumbnail: Page 
1222
    1222
  • Thumbnail: Page 
1223
    1223
  • Thumbnail: Page 
1224
    1224