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Author Solheim, B. G. B. ♦ Johnsson, A. ♦ Iversen, T-H
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher Wiley
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Natural sciences & mathematics ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Natural history of organisms ♦ Technology ♦ Medicine & health ♦ Human anatomy, cytology, histology ♦ Human physiology ♦ Diseases ♦ Agriculture & related technologies ♦ Manufacture for specific uses ♦ Precision instruments & other devices
Subject Domain (in MeSH) Plant Structures ♦ Anatomy ♦ Eukaryota ♦ Organisms ♦ Investigative Techniques ♦ Analytical, Diagnostic and Therapeutic Techniques and Equipment ♦ Physical Phenomena ♦ Physiological Phenomena ♦ Biological Sciences ♦ Technology, Industry, and Agriculture ♦ Technology and Food and Beverages
Subject Keyword Discipline Botany ♦ Arabidopsis ♦ Physiology ♦ Gravitropism ♦ Movement ♦ Periodicity ♦ Plant Leaves ♦ Weightlessness ♦ Centrifugation ♦ Darkness ♦ Light ♦ Space Flight ♦ Time Factors ♦ Journal Article ♦ Research Support, Non-u.s. Gov't
Abstract Ultradian movements of Arabidopsis thaliana rosette leaves were discovered and studied under microgravity conditions in space. Weightlessness revealed new facets of these movements. The European Modular Cultivation System (EMCS) was used in a long-term white-light, light-darkness (LD; 16 : 8 h) experiment on the International Space Station (ISS). Leaves reacted with slow up or down movement (time constant several hours) after transitions to darkness or light, respectively. Superimposed movements with periods of c. 80-90 min and small-amplitude pulsed movements of 45 min were present in the light. Signal analysis (fast Fourier transform (FFT) analysis) revealed several types and frequencies of movements. Identical phase coupling was observed between the 45-min movements of the leaves of one plant. In darkness, movements of c. 120-min period were recorded. The EMCS allowed 0-g to 1-g transitions to be created. Leaves on plants germinated in microgravity started a negative gravitropic reaction after a delay of c. 30 min. Leaves grown on a 1-g centrifuge reacted to the same transition with an equal delay but had a weaker gravitropic response. The experiments provide unequivocal demonstrations of ultradian, self-sustained rhythmic movements in A. thaliana rosette leaves in the absence of the effect of gravity.
Description Country affiliation: Norway
Author Affiliation: Solheim BG ( Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway. firma@rte.gs)
ISSN 0028646X
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2009-01-01
Publisher Place Great Britain (UK)
e-ISSN 14698137
Journal New Phytologist
Volume Number 183
Issue Number 4


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Source: WHO-Global Index Medicus