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Wall relaxation and the driving forces for cell expansive growthWhen 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.
Document ID
20040089645
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cosgrove, D. J.
(University Park 16802 United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Plant physiology
Volume: 84
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program Space Biology
NASA Discipline Plant Biology
Review
NASA Discipline Number 40-30
Non-NASA Center
Review, Tutorial

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