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[Cyto-embryologic investigation of super dwarf wheat grown on board of the Mir orbital complex]The cytoembryologic analysis of wet and dry samples of super dwarf wheat cultivated in greenhouse SVET aboard the MIR station over the whole cycle of vegetation was made with the use of light microscopy. Characteristic features of wheat development in space flight are plentiful early tillering, and formation and rapid growth of side shoots. Elementary spikelets in the composite head were more numerous but the top spikelets were rudimentary and, therefore, the ripe head contained less of these spikelets as compared with the ground controls (9-13 and 14, respectively). The number of florets in a spike was also higher reaching 14-16 vs. 7-8 in the control. Typically, no more than 4 to 5 florets vs. 3 in the control were fully differentiated while the others died off earlier in development. The fact that there were no caryopses found in the flight crop is explained by absolute male sterility appearing at different stages of staminal development: before archesporium formation, on the stage of differentiated archesporium, during meiosis, on the stage of microspores or uninucleate "pollen". The female generative system developed mainly without abnormalities. An assumption was made that elevated ethylene concentrations in the MIR atmosphere at the time of the wheat experiment were the cause for abnormal development of the male generative system which led to barrenness of the super dwarf wheat crop.
Document ID
20040141908
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Veselova, T. D.
Il'ina, G. M.
Dzhaliova, Kh Kh
Levinskikh, M. A.
Sychev, V. N.
Salisbury, F. B.
Campbell, W. F.
Date Acquired
August 22, 2013
Publication Date
January 1, 1999
Publication Information
Publication: Aviakosmicheskaia i ekologicheskaia meditsina = Aerospace and environmental medicine
Volume: 33
Issue: 2
ISSN: 0233-528X
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
manned
Non-NASA Center
Mir Project
NASA Discipline Life Support Systems
long duration
Flight Experiment

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