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Differential changes in size distribution of xyloglucan in the cell walls of gravitropically responding Pisum sativum epicotylsGrowth-related change in the size distribution of hemicellulosic wall polymers during the gravitropic curvature response of intact pea (Pisum sativum L. cv Alaska) epicotyls was examined by gel-filtration chromatography. The gravitropic response was characterized by the appearance of curvature 20 to 30 min after horizontal placement, with 35 degrees of curvature attained by 80 min. Correlated with the onset of curvature, on the upper side of the epicotyl, there was a conspicuous transient increase in the abundance of relatively large hemicellulosic xyloglucan polymers, similar to increases previously found under conditions where diminished wall extensibility was expected. On the lower side there was a moderate, slower, and longer-term increase in abundance of small xyloglucan, similar to changes previously found in connection with auxin-stimulated growth responses. Both shifts occurred primarily in the epidermis. They appear to represent two coordinated physiological mechanisms contributing to differential growth.
Document ID
20040112234
Acquisition Source
Kennedy Space Center
Document Type
Reprint (Version printed in journal)
Authors
Talbott, L. D.
(Washington University St. Louis, Missouri 63130, United States)
Pickard, B. G.
Date Acquired
August 21, 2013
Publication Date
October 1, 1994
Publication Information
Publication: Plant physiology
Volume: 106
Issue: 2
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAGW-70
CONTRACT_GRANT: NAG10-1022
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Plant Biology

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