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Light-regulated root gravitropism: a role for, and characterization of, a calcium/calmodulin-dependent protein kinase homologRoots of many species grow downward (orthogravitropism) only when illuminated. Previous work suggests that this is a calcium-regulated response and that both calmodulin and calcium/calmodulin-dependent kinases participate in transducing gravity and light stimuli. A genomic sequence has been obtained for a calcium/calmodulin-dependent kinase homolog (MCK1) expressed in root caps, the site of perception for both light and gravity. This homolog consists of 7265 base pairs and contains 11 exons and 10 introns. Since MCK1 is expressed constitutively in both light and dark, it is unlikely that the light directly affects MCK1 expression, though the activity of the protein may be affected by light. In cultivars showing light-regulated gravitropism, we hypothesize that MCK1, or a homolog, functions in establishing the auxin asymmetry necessary for orthogravitropism.
Document ID
20040172906
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lu, Y. T.
(University of California Berkeley 94720-3102, United States)
Feldman, L. J.
Date Acquired
August 22, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Planta
Volume: 203 Suppl
ISSN: 0032-0935
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Plant Biology
Non-NASA Center

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