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Auxins and tropismsDifferential growth of plants in response to the changes in the light and gravity vectors requires a complex signal transduction cascade. Although many of the details of the mechanisms by which these differential growth responses are induced are as yet unknown, auxin has been implicated in both gravitropism and phototropism. Specifically, the redistribution of auxin across gravity or light-stimulated tissues has been detected and shown to be required for this process. The approaches by which auxin has been implicated in tropisms include isolation of mutants altered in auxin transport or response with altered gravitropic or phototropic response, identification of auxin gradients with radiolabeled auxin and auxin-inducible gene reporter systems, and by use of inhibitors of auxin transport that block gravitropism and phototropism. Proteins that transport auxin have been identified and the mechanisms which determine auxin transport polarity have been explored. In addition, recent evidence that reversible protein phosphorylation controls this process is summarized. Finally, the data in support of several hypotheses for mechanisms by which auxin transport could be differentially regulated during gravitropism are examined. Although many details of the mechanisms by which plants respond to gravity and light are not yet clear, numerous recent studies demonstrate the role of auxin in these processes.
Document ID
20040088295
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Muday, G. K.
(Wake Forest University Winston-Salem, North Carolina 27109-7325, United States)
Brown, C. S.
Date Acquired
August 21, 2013
Publication Date
September 1, 2001
Publication Information
Publication: Journal of plant growth regulation
Volume: 20
Issue: 3
ISSN: 0721-7595
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAG2-1203
CONTRACT_GRANT: NAGW-4984
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
Review, Academic
Review
Non-NASA Center

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