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Plant and Cell Physiology Advance Access published online on January 19, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci006
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights researved.
Received February 25, 2004
Accepted October 20, 2004

Regular Paper

Vascular-Tissue Abundant Expression of Plant TAF10, an Orthologous Gene for TATA Box-Binding Protein-Associated Factor 10, in Flaveria trinervia and Abnormal Morphology of Arabidopsis thaliana Transformants on Its over-Expression

Tsuyoshi Furumoto 1, Yosuke Tamada 1, Atsushi Izumida 2, Hiromi Nakatani 1, Shingo Hata 3, and Katsura Izui 3*

1 Laboratory of Plant Physiology, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
2 Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
3 Laboratory of Plant Physiology, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan

* To whom correspondence should be addressed.
Katsura Izui, E-mail: izui{at}kais.kyoto-u.ac.jp


  Abstract

TAF10 is one of the TATA box-binding protein-associated factors (TAFs), which constitute the TFIID complex. We isolated a plant TAF10 ortholog from Flaveria trinervia cDNA library, and named it ftTAF10. The ftTAF10 polypeptide contains a histone-fold motif, which is highly conserved among other organism's TAF10s. A transiently expressed GFP-fusion protein was translocated into the nuclei of onion epidermal cells, suggesting that the ftTAF10 functions in nuclei. The transcript level was higher in stems and roots than in leaves, and in situ hybridization of F. trinervia seedlings revealed that the ftTAF10 transcript is abundantly accumulated in vascular tissues of hypocotyls, in central cylinder of roots, and slightly in bundle sheath cells of leaves. Over-expression of ftTAF10 in Arabidopsis under the CaMV 35S promoter caused two kinds of abnormal morphology, limitation of the indeterminate inflorescence and production of deformed leaves. These results indicate possibilities that ftTAF10 is a plant "selective TAF" involved in the expression of a subset of vascular abundant genes, and that its appropriate gene expression is necessary for the normal development.

Keywords: General transcription factor; nuclear localization; TAF10; terminal flower-like phenotype; vascular tissue; Flaveria trinervia.
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