Document Detail

Amyloplasts as possible statoliths in gravitropic protonemata of the moss Ceratodon purpureus.
MedLine Citation:
PMID:  11538268     Owner:  NASA     Status:  MEDLINE    
The kinetics of gravitropism and of amyloplast sedimentation were studied in dark-grown protonemata of the moss Ceratodon purpureus (Hedw.) Brid. The protonemata grew straight up at a rate of 20-25 micromoles h-1 in nutrient-supplemented agar. After they were oriented to the horizontal, upward curvature was first detected after 1-1.5 h and reached 84 degrees by 24 h. The tip cells exhibited an amyloplast zonation, with a tip cluster of non-sedimenting amyloplasts, an amyloplast-free zone, and a zone with pronounced amyloplast sedimentation. This latter zone appears specialized more for lateral than for axial sedimentation since amyloplasts sediment to the lower wall in horizontal protonemata but do not fall to the basal wall in vertical protonemata. Amyloplast sedimentation started within 15 min of gravistimulation; this is within the 12-17-min presentation time. The data support the hypothesis that some amyloplasts function as statoliths in these cells.
L M Walker; F D Sack
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Planta     Volume:  181     ISSN:  0032-0935     ISO Abbreviation:  Planta     Publication Date:  1990  
Date Detail:
Created Date:  1995-12-11     Completed Date:  1995-12-11     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  1250576     Medline TA:  Planta     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  71-7     Citation Subset:  S    
Department of Botany, Ohio State University, Columbus 43210-1293, USA.
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MeSH Terms
Cell Compartmentation
Gravitropism / physiology*
Gravity Sensing / physiology*
Plants / cytology,  growth & development*,  ultrastructure
Plastids / physiology*
Time Factors
F D Sack / OH St U, Columbus, Dept Botany

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