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Cellular mechanisms underlying growth asymmetry during stem gravitropismPlant stems respond to gravitropic stimulation with a rapid, local and reversible change in cell growth rate (elongation), generally on both the upper and lower sides of the stem. The cellular and biochemical mechanisms for this differential growth are reviewed. Considerable evidence implicates an asymmetry in wall pH in the growth response. The strengths and weaknesses of the wall "loosening enzyme" concept are reviewed and the possibility of expansin involvement in the bending response of stems is considered. Also discussed is the possibility that wall stiffening processes, e.g. phenolic coupling driven by oxidative bursts or altered orientation of newly deposited cellulose, might mediate the growth responses during gravitropism.
Document ID
20040089433
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
September 1, 1997
Publication Information
Publication: Planta
Volume: 203
Issue: Suppl 1
ISSN: 0032-0935
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
Review, Tutorial
Review
Non-NASA Center

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