NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 62 of 10368
Wall relaxation and the driving forces for cell expansive growth
Author and Affiliation:
Cosgrove, D. J.(University Park 16802, Department of Biology, Pennsylvania State University, United States)
Abstract: When water uptake by growing cells is prevented, the turgor pressure and the tensile stress in the cell wall are reduced by continued wall loosening. This process, termed in vivo stress relaxation, provides a new way to study the dynamics of wall loosening and to measure the wall yield threshold and the physiological wall extensibility. Stress relaxation experiments indicate that wall stress supplies the mechanical driving force for wall yielding. Cell expansion also requires water absorption. The driving force for water uptake during growth is created by wall relaxation, which lowers the water potential of the expanding cells. New techniques for measuring this driving force show that it is smaller than believed previously; in elongating stems it is only 0.3 to 0.5 bar. This means that the hydraulic resistance of the water transport pathway is small and that rate of cell expansion is controlled primarily by wall loosening and yielding.
Publication Date: Jan 01, 1987
Document ID:
20040089645
(Acquired Sep 07, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Plant physiology (ISSN 0032-0889); Volume 84; 561-4
Publisher Information: United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CELL DIVISION; CYTOLOGY; STEMS; WALLS; WATER; BIOPHYSICS; CELL MEMBRANES (BIOLOGY); EXOBIOLOGY; METABOLISM; MODELS; OSMOSIS; PLANT PHYSIOLOGY; PLANTS (BOTANY); TRANSPIRATION
Other Descriptors: PLANT STEMS/CYTOLOGY/GROWTH & DEVELOPMENT/METABOLISM/PHYSIOLOGY; WATER/METABOLISM; BIOLOGICAL TRANSPORT; BIOPHYSICS; CELL DIVISION/PHYSIOLOGY; CELL WALL/PHYSIOLOGY; MODELS, BIOLOGICAL; OSMOLAR CONCENTRATION; OSMOTIC PRESSURE; PLANT TRANSPIRATION/PHYSIOLOGY; REVIEW; REVIEW, TUTORIAL; NASA DISCIPLINE NUMBER 40-30; NASA DISCIPLINE PLANT BIOLOGY; NASA PROGRAM SPACE BIOLOGY; NON-NASA CENTER
Availability Source: Other Sources
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 23, 2011
Contact Us