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Karyological observationsRoot tips prepared for metaphase chromosome analysis from seedlings germinated under microgravity on the Space Shuttle (oats and mung bean) or which were exposed to space flight as very young seedlings (sunflower) have been examined. Experimental constraints did not permit pre-fixation in space with a cytostatic agent but arrest was achieved in the first division cycle on Earth after recovery. The number of cells in division was significantly depressed in all three species. Several chromosomal abnormalities were encountered in flight material. Bridge formation was seen in sunflower, as was aneuploidy. Breakage and fracture of chromosomes was prevalent in oats. No aberrant features could be detected in the chromosomes of mung bean. These results, although preliminary, should serve to alert investigators of the need to assess carefully as many aspects of cell division in higher plants exposed to space flight conditions as possible.
Document ID
20040089936
Document Type
Reprint (Version printed in journal)
Authors
Krikorian, A. D.
(State University of New York at Stony Brook 11794 United States)
O'Connor, S. A.
Date Acquired
August 21, 2013
Publication Date
November 1, 1984
Publication Information
Publication: Annals of botany
Volume: 54
Issue: Suppl 3
ISSN: 0305-7364
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NSG-7270
Distribution Limits
Public
Copyright
Other
Keywords
STS-2 Shuttle Project
STS-3 Shuttle Project
Flight Experiment
Non-NASA Center
NASA Discipline Plant Biology
short duration
NASA Program Space Biology
NASA Discipline Number 40-20
manned
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