Document Detail

Cellular changes in wheat seedlings during orbital flight.
MedLine Citation:
PMID:  11942355     Owner:  NASA     Status:  MEDLINE    
Wheat seedlings in weightlessness aboard NASA Biosatellite 2 differ from ground control seedlings in mitotic count, cell length and nuclear volume as well as in orientation, starch grain distribution, organ length and malformations previously reported to COSPAR. Dividing cells are fewer in roots of orbited seedlings than in erect or clinostat ground controls. The greatest difference is among cells in early prophase. Root cells, proximal to the zone of cell division are longer in flight seedlings than erect or clinostat ground controls. As the roots are the same length, greater elongation compensates for the reduced rate of cell division. Volume of interphase nuclei in all seedling organs is increased by orbital flight. In clinostat controls, only nuclei of primary roots increase in size. Between 58 and 65 hours of age, nuclear volume in erect 1 g coleoptiles decreases; in flight seedlings it increases. Simulated launch vibration, alone or followed by growth on the clinostat, increases nuclear volume in some roots, but coleoptile nuclei do not respond as in flight seedlings. Thus, at the cellular level, orbital flight cannot be exactly duplicated by the clinostat whether preceded by vibration or not.
B F Edwards; S W Gray
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Life sciences and space research     Volume:  9     ISSN:  0075-9422     ISO Abbreviation:  Life Sci Space Res     Publication Date:  1971  
Date Detail:
Created Date:  2002-04-09     Completed Date:  2002-05-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1250331     Medline TA:  Life Sci Space Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  113-8     Citation Subset:  S    
Department of Anatomy, Emory University, Atlanta, Georgia, USA.
Space Flight Mission:
Biosatellite 2 Project; Flight Experiment; short duration; unmanned
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MeSH Terms
Cell Nucleus
Cell Size
Cotyledon / cytology,  growth & development,  physiology
Mitotic Index
Plant Roots / cytology,  growth & development,  physiology
Space Flight*
Triticum / cytology*,  growth & development*,  physiology
Weightlessness Simulation*

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

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