Title
The role of brassinosteroids in shoot gravitropism The role of brassinosteroids in shoot gravitropism
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Rockville, Md ,
Subject
Biology
Source (journal)
Plant physiology. - Rockville, Md
Volume/pages
156(2011) :3 , p. 1331-1336
ISSN
0032-0889
ISI
000292294100031
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
In the current model of gravitropism, negative gravitropic (upward) growth of the shoot of a dicotyledonous plant involves sedimentation of starch-containing plastids (statoliths) in the endodermis (starch sheath). Here we show that high levels of brassinosteroids (BRs) counteract gravitropic growth, while BR deficiency enhances gravitropism irrespective of the presence of a functional starch sheath. These data support a role for BRs as negative regulators of the shoot graviresponse.
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