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The role of calcium ions in gravity signal perception and transductionCa2+ is implicated as a messenger in coupling various environmental stimuli, such as gravity and light, to response. In recent years, it has become evident that Ca2+ plays a central role in all three phases of gravitropism--perception, transduction and response. The root cap, which is known to contain high amounts of Ca2+ and calmodulin, is the primary site of gravity perception. The possible role of phosphoinositide turnover and Ca(2+) - and Ca(2+) -calmodulin-dependent enzymes such as Ca(2+) -ATPase and protein kinases in gravitropism is discussed. A model is proposed to describe the role of Ca2+ in both normal and light-dependent gravity response in roots.
Document ID
20040089610
Acquisition Source
Kennedy Space Center
Document Type
Reprint (Version printed in journal)
Authors
Poovaiah, B. W.
(Washington State University Pullman 99164-6414, United States)
McFadden, J. J.
Reddy, A. S.
Date Acquired
August 21, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Physiologia plantarum
Volume: 71
ISSN: 0031-9317
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: DCB-8502215
CONTRACT_GRANT: NAG10-0032
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program Space Biology
Review, Tutorial
NASA Discipline Number 40-30
Non-NASA Center
NASA Discipline Plant Biology
Review

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