NDLI: Isolation and functional characterization of a floral tissue-specific R2R3 MYB regulator from tobacco

Content Provider	Springer Nature Link
Author	Pattanaik, Sitakanta Kong, Que Zaitlin, David Werkman, Joshua R. Xie, Claire H. Patra, Barunava Yuan, Ling
Copyright Year	2010
Abstract	Tobacco is a commonly used heterologous system for studying combinatorial regulation of the flavonoid biosynthetic pathway by the bHLH–MYB transcription factor (TF) complex in plants. However, little is known about the endogenous tobacco bHLH and MYB TFs involved in the pathway. Ectopic expression in tobacco of heterologous bHLH TF genes, such as maize Lc, leads to increased anthocyanin production in the reproductive tissues, suggesting the presence of a reproductive tissue-specific MYB TF that interacts with the Lc-like bHLH TFs. We isolated a gene (NtAn2) encoding a R2R3 MYB TF from developing tobacco flowers. NtAn2 shares high sequence homology with other known flavonoid-related MYB TFs and is mostly expressed in developing flowers. Constitutive ectopic expression of NtAn2 induces whole-plant anthocyanin production in tobacco and Arabidopsis. In transgenic tobacco and Arabidopsis expressing NtAn2, both subsets of early and late flavonoid pathway genes are up-regulated. Suppression of NtAn2 by RNAi in tobacco resulted in a white-flowered phenotype and the inhibition of the late pathway genes. Yeast two-hybrid assays demonstrated that NtAn2 can interact with five heterologous bHLH TFs known to induce anthocyanin synthesis in other species including maize, perilla, snapdragon and Arabidopsis. Bimolecular fluorescent complementation using split YFP demonstrated that NtAn2 interacts with Lc in tobacco cells and that the complex is localized to nuclei. Transient co-expression of NtAn2 and Lc or Arabidopsis TT8 in tobacco protoplasts activated the promoters of two key flavonoid pathway genes, chalcone synthase and dihydroflavonol reductase. These results suggest that NtAn2 is a key gene controlling anthocyanin production in reproductive tissues of tobacco.
Starting Page	1061
Ending Page	1076
Page Count	16
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	231
Issue Number	5
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-02-16
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anthocyanin bHLH transcription factor Combinatorial transcriptional regulation MYB transcription factor Nicotiana Ecology Forestry Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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