start-ver=1.4
cd-journal=joma
no-vol=7
cd-vols=
no-issue=8
article-no=
start-page=937
end-page=939
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2012
dt-pub=201208
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Thermospermine suppresses auxin-inducible xylem differentiation in Arabidopsis thaliana
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=YoshimotoKaori
en-aut-sei=Yoshimoto
en-aut-mei=Kaori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=NoutoshiYoshiteru
en-aut-sei=Noutoshi
en-aut-mei=Yoshiteru
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=HayashiKen-ichiro
en-aut-sei=Hayashi
en-aut-mei=Ken-ichiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=ShirasuKen
en-aut-sei=Shirasu
en-aut-mei=Ken
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=TakahashiTaku
en-aut-sei=Takahashi
en-aut-mei=Taku
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=MotoseHiroyasu
en-aut-sei=Motose
en-aut-mei=Hiroyasu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

affil-num=1
en-affil=
kn-affil=Division of Bioscience; Graduate School of Natural Science and Technology; Okayama University

affil-num=2
en-affil=
kn-affil=Research Core for Interdisciplinary Sciences; Okayama University

affil-num=3
en-affil=
kn-affil=Department of Biochemistry; Okayama University of Science

affil-num=4
en-affil=
kn-affil=Plant Science Center; RIKEN

affil-num=5
en-affil=
kn-affil=Division of Bioscience; Graduate School of Natural Science and Technology; Okayama University

affil-num=6
en-affil=
kn-affil=Division of Bioscience; Graduate School of Natural Science and Technology; Okayama University
en-keyword=2,4-D
kn-keyword=2,4-D
en-keyword=ACAULIS5
kn-keyword=ACAULIS5
en-keyword=auxin
kn-keyword=auxin
en-keyword=chemical biology
kn-keyword=chemical biology
en-keyword=thermospermine
kn-keyword=thermospermine
en-keyword=xylem differentiation
kn-keyword=xylem differentiation
END