Skip Navigation

This Article
Right arrow Full Text (PDF)
Right arrow E-letters: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when E-letters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by KUTSCHERA, U.
Right arrow Articles by KÖHILER, K.
Right arrow Search for Related Content
PubMed
Right arrow Articles by KUTSCHERA, U.
Right arrow Articles by KÖHILER, K.
Agricola
Right arrow Articles by KUTSCHERA, U.
Right arrow Articles by KÖHILER, K.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© 1992 Oxford University Press

RESEARCH-ARTICLE

Turgor and Longitudinal Tissue 12Helianthus annuus

U. KUTSCHERA and K. KÖHILER

Botanisches Institut, Universitat Bonn Venusbergweg 22, W-5300 Bonn 1, Federal Republic of Germany

To whom correspondence should be addressed.

The quantitative relationship between turgor and the pressure exerted by the inner tissues (cortex, vascular tissue, and pith) on the peripheral cell walls (longitudinal tissue pressure) was investigated in hypocotyls of sunflower seedlings (Helianthus annuus L.) In etiolated hypocotyls cell turgor pressures, as measured with the pressure probe, were in the range 0·38 to 0·55 MPa with an average of 0·48 MPa. In irradiated hypocotyls turgor pressures varied from 0·40 to 0·57 MPa with a, mean at 0·49 MPa. The pressure exerted by the inner tissues on the outer walls was estimated by incubating peeled sections in a series of osmotic test solutions (polyethylene glycol 8000). The length change was measured with a transducer. In both etiolated and irradiated hypocotyls an external osmotic pressure of 0·5 MPa was required to inhibit elongation of the inner tissues, i.e. the average cell turgor and the longitudinal tissue pressure are very similar quantities. The results indicate that the turgor of the inner tissues is displaced to and borne by the thick, growth-limiting peripheral cell walls of the hypocotyl.

Key words: Helianthus annuus, hypocotyl growth, tissue pressure, turgor pressure, wall stress


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Am. J. Bot.Home page
P. Schopfer
Biomechanics of plant growth
Am. J. Botany, October 1, 2006; 93(10): 1415 - 1425.
[Abstract] [Full Text] [PDF]

Home page
 Plant Physiol.Home page
W. S. Peters and A. D. Tomos
The Mechanic State of "Inner Tissue" in the Growing Zone of Sunflower Hypocotyls and the Regulation of Its Growth Rate Following Excision
Plant Physiology, June 1, 2000; 123(2): 605 - 612.
[Abstract] [Full Text]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.