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Assessing potential targets of calcium action in light-modulated gravitropismLight, through the mediation of the pigment phytochrome, modulates the gravitropic response of the shoots and roots of many plants. The transduction of both light and gravity stimuli appears to involve Ca(2+)-regulated steps, one or more of which may represent points of intersection between the two transduction chains. To be confident that Ca2+ plays a critical role in stimulus-response coupling for gravitropism, it will be important to identify specific targets of Ca2+ action whose function can be clearly linked to the regulation of growth. Calcium typically exerts its influence on cell metabolism through binding to and activating key regulatory proteins. The three best characterized of these proteins in plants are the calmodulins, calcium-dependent protein kinases, and annexins. In this review we summarize what is known about the structure and function of these proteins and speculate on how their activation by Ca2+ could influence the differential growth response of gravitropism.
Document ID
20040090015
Document Type
Reprint (Version printed in journal)
Authors
Roux, S. J. (The University of Texas at Austin 78713 United States)
Date Acquired
August 21, 2013
Publication Date
October 1, 1995
Publication Information
Publication: ASGSB bulletin : publication of the American Society for Gravitational and Space Biology
Volume: 8
Issue: 2
ISSN: 0898-4697
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: DCB 91-06245
CONTRACT_GRANT: NAGW-1519
Distribution Limits
Public
Copyright
Other
Keywords
Review, Tutorial
Review
NASA Discipline Plant Biology
NASA Program Space Biology
NASA Discipline Number 40-50
Non-NASA Center