NDLI: DkMyb2 wound-induced transcription factor of persimmon (Diospyros kaki Thunb.), contributes to proanthocyanidin regulation

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Planta : Volume 232, Issue 4, September 2010

Planta : Volume 232, Issue 3, August 2010

Planta : Volume 232, Issue 2, July 2010

Planta : Volume 232, Issue 1, June 2010

DkMyb2 wound-induced transcription factor of persimmon (Diospyros kaki Thunb.), contributes to proanthocyanidin regulation

Content Provider	Springer Nature Link
Author	Akagi, Takashi Ikegami, Ayako Yonemori, Keizo
Copyright Year	2010
Abstract	Proanthocyanidins (PAs) are secondary metabolites that contribute to the protection of a plant against biotic and abiotic stresses. Persimmon (Diospyros kaki) accumulates abundant PAs in each plant organ, and some potential Myb-like transcription factors (Myb-TFs) involved in the production of PAs have been isolated. In this study, we aimed to molecularly characterize one of them, DkMyb2, which was placed in a subclade including a PA regulator of Arabidopsis (Arabidopsis thaliana), TRANSPARENT TESTA2 (TT2), and was co-induced with PA pathway genes after wound stress. Ectopic DkMyb2 overexpression caused significant up-regulation of PA pathway genes in transgenic persimmon calluses and significant accumulation of PA, and increased mean degree of polymerization of PAs in transgenic kiwifruit calluses. Analysis of the DNA-binding ability of DkMyb2 by electrophoretic mobility shift assays showed that DkMyb2 directly binds to the AC-rich cis-motifs known as AC elements in the promoters of the two PA pathway genes in persimmon, DkANR, and DkLAR. Furthermore, a transient reporter assay using a dual-luciferase system demonstrated direct transcriptional activation of DkANR and DkLAR by DkMyb2. We also discuss subfunctionalization of two PA regulators in persimmon, DkMyb2 and DkMyb4, as well as PA regulators in other plant species from the viewpoint of their ability to bind to cis-motifs and their functions in transcriptional activation. Our results provide insight into the multiple regulatory mechanisms that control PA metabolism by Myb-TFs in persimmon.
Starting Page	1045
Ending Page	1059
Page Count	15
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	232
Issue Number	5
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-08-06
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cis-motif DkMyb2 DkMyb4 Persimmon Proanthocyanidin Ecology Forestry Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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