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
Related Documents :
18587148 - A new multicomponent npq mechanism in the diatom cyclotella meneghiniana.
12741758 - Hybrid virus-polymer materials. 1. synthesis and properties of peg-decorated cowpea mos...
9736708 - Tobacco mosaic virus infection induces severe morphological changes of the endoplasmic ...
16453568 - The three-dimensional folding of the trna-like structure of tobacco mosaic virus rna. a...
9611678 - Epidemiology of tick-borne encephalitis in japan.
23207068 - Cowpox virus but not vaccinia virus induces secretion of cxcl1, il-8 and il-6 and chemo...
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.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
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

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Continental-pelagic carbonate partitioning and the global carbonate-silicate cycle.
Next Document:  Computer-based video digitizer analysis of surface extension in maize roots: kinetics of growth rat...