Document Detail


Interaction of growth-determining systems with gravity.
MedLine Citation:
PMID:  11537846     Owner:  NASA     Status:  MEDLINE    
Abstract/OtherAbstract:
The experiments have been carried out with lettuce shoots on board the Salyut-7 orbital station the Kosmos-1667 biological satellite and under ground conditions at 180 degrees plant inversion. By means of the centrifuge Biogravistat-1M the threshold value of gravitational sensitivity of lettuce shoots has been determined on board the Salyut-7 station. It was found to be equal to 2.9 x 10(-3)g for hypocotyls and 1.5 x 10(-4)g for roots. The following results have been received in the experiment performed on board the Kosmos-1667 satellite: a) under microgravity the proliferation of the meristem cells and the growth of roots did not differ from the control; b) the growth of hypocotyls in length was significantly enhanced in microgravity; c) under microgravity transverse growth of hypocotyls (increase in cross sectional area) was significantly increased due to enhancement of cortical parenchyma cell growth. At 180 degrees inversion in Earth's gravity root extension growth and rate of cell division in the root apical meristem were decreased. The determination of DNA-fuchsin value in the nuclei of the cell root apexes showed that inversion affected processes of the cell cycle preceding cytokinesis.
Authors:
A Merkys; R Laurinavicius; D Bendoraityte; D Svegzdiene; O Rupainiene
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Advances in space research : the official journal of the Committee on Space Research (COSPAR)     Volume:  6     ISSN:  0273-1177     ISO Abbreviation:  Adv Space Res     Publication Date:  1986  
Date Detail:
Created Date:  1999-09-28     Completed Date:  1999-09-28     Revised Date:  2007-04-16    
Medline Journal Info:
Nlm Unique ID:  9878935     Medline TA:  Adv Space Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  71-80     Citation Subset:  S    
Affiliation:
Institute of Botany of the Academy of Sciences of the Lithuanian SSR, Vilnius, USSR.
Space Flight Mission:
Cosmos 1667 Project; Flight Experiment; Salyut 7 Project; long duration; manned; short duration; unmanned
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MeSH Terms
Descriptor/Qualifier:
Cell Division
Centrifugation
DNA, Plant
Gravitation*
Gravitropism / genetics,  physiology*
Hypocotyl / cytology,  genetics,  growth & development
Lettuce / cytology,  genetics,  growth & development*
Mitosis / physiology
Plant Roots / cytology,  genetics,  growth & development
Plant Shoots / cytology,  genetics,  growth & development
Space Flight*
Weightlessness*
Chemical
Reg. No./Substance:
0/DNA, Plant

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


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