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ID 48759
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Author
Yoshimoto, Kaori
Noutoshi, Yoshiteru Kakenhi
Hayashi, Ken-ichiro
Shirasu, Ken
Abstract
Thermospermine, a structural isomer of spermine, is synthesized by a thermospermine synthase designated ACAULIS5 (ACL5). Thermospermine-deficient acl5 mutant of Arabidopsis thaliana shows severe dwarfism and excessive xylem differentiation. By screening for compounds that affect xylem differentiation in the acl5 mutant, we identified auxin analogs that remarkably enhanced xylem vessel differentiation in the acl5 mutant but not in the wild type. The xylem-inducing effect of auxin analogs was clearly suppressed by thermospermine, indicating that auxin-inducible xylem differentiation is normally limited by thermospermine. Here, we further characterized xylem-inducing effect of auxin analogs in various organs. Auxin analogs promoted protoxylem differentiation in roots and cotyledons in the acl5 mutant. Our results indicate that the opposite action between thermospermine and auxin in xylem differentiation is common in different organs and also suggest that thermospermine might be required for the suppression of protoxylem differentiation.
Keywords
2,4-D
ACAULIS5
auxin
chemical biology
thermospermine
xylem differentiation
Published Date
2012-08
Publication Title
Plant Signaling & Behavior
Volume
volume7
Issue
issue8
Start Page
937
End Page
939
ISSN
1559-2316
Content Type
Journal Article
Official Url
http://dx.doi.org/10.4161/psb.20784
language
英語
Copyright Holders
© 2012 Landes Bioscience
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author
Refereed
True
DOI
PubMed ID