Document Detail

The right-handed slanting of Arabidopsis thaliana roots is due to the combined effects of positive gravitropism, circumnutation and thigmotropism.
MedLine Citation:
PMID:  12124179     Owner:  NASA     Status:  MEDLINE    
When primary Arabidopsis roots grow down a tilted agar plate, they do not elongate following the gravitational vector along a straight line, but instead they slant noticeably to the right-hand. This process is seen mostly in the ecotypes Wassilewskjia and Landsberg, whereas it is attenuated in the ecotype Columbia, and in some mutants is even inverted. The origin of the slanting of Arabidopsis roots, that evidently constitutes a form of chirality, has so far not been sufficiently clarified. In the present paper we describe it as the general result of the cumulative effects of positive gravitropism, circumnutation and a thigmotropic obstacle-avoiding movement, and in particular, as the consequence of the alternating movement of circumnutation of the root to the right and to the left of the gravitational vector. This movement, which does not appear symmetrical in its nature, since the waves made to the right-hand are complete whereas those made to the left-hand are reduced or aborted, appears to be the reason for the observed slanting. In addition, evidence is furnished supporting the hypothesis that the strong left-handed cell-files torsion, seen in right-handed coiling roots, is not the consequence of a primary process, but of an artifact, and is due to the adjustment of the three dimensional root circumnutating helix to the flat two dimensional agar surface.
F Migliaccio; S Piconese; G Tronelli
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology     Volume:  7     ISSN:  1077-9248     ISO Abbreviation:  J Gravit Physiol     Publication Date:  2000 Dec 
Date Detail:
Created Date:  2002-07-18     Completed Date:  2002-08-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9437868     Medline TA:  J Gravit Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-6     Citation Subset:  S    
Institute of Plant Biochemistry and Ecophysiology, Consiglio Nazionale delle Ricerche, Monterotondo (Rome), Italy.
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MeSH Terms
Arabidopsis / genetics,  growth & development*,  physiology
Culture Media
Gravitropism / genetics,  physiology*
Physical Stimulation
Plant Roots / genetics,  growth & development*,  physiology
Reg. No./Substance:
0/Culture Media; 9002-18-0/Agar

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

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