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Published on November 18, 2005; 10.1104/pp.105.067140

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Received June 14, 2005
Returned for revision July 22, 2005
Accepted August 24, 2005

At5PTase13 Modulates Cotyledon Vein Development through Regulating Auxin Homeostasis

Wen-Hui Lin , Yuan Wang , Bernd Mueller-Roeber , Charles A. Brearley , Zhi-Hong Xu , and Hong-Wei Xue *

National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China; Partner Group of the Max-Planck-Institute of Molecular Plant Physiology on Plant Molecular Physiology and Signal Transduction, 200032 Shanghai, People's Republic of China
University of Potsdam, Institute of Biochemistry and Biology, D-14476 Golm, Germany
School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom
National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China

* Corresponding author; email: hwxue{at}sibs.ac.cn.

Phosphatidylinositol signaling pathway and the relevant metabolites are known to be critical to the modulation of different aspects of plant growth, development, and stress responses. Inositol polyphosphate 5-phosphatase is a key enzyme involved in phosphatidylinositol metabolism and is encoded by an At5PTase gene family in Arabidopsis thaliana. A previous study shows that At5PTase11 mediates cotyledon vascular development probably through the regulation of intracellular calcium levels. In this study, we provide evidence that At5PTase13 modulates the development of cotyledon veins through its regulation of auxin homeostasis. A T-DNA insertional knockout mutant, At5pt13-1, showed a defect in development of the cotyledon vein, which was rescued completely by exogenous auxin and in part by brassinolide, a steroid hormone. Furthermore, the mutant had reduced auxin content and altered auxin accumulation in seedlings revealed by the DR5:{beta}-glucuronidase fusion construct in seedlings. In addition, microarray analysis shows that the transcription of key genes responsible for auxin biosynthesis and transport was altered in At5pt13-1. The At5pt13-1 mutant was also less sensitive to auxin inhibition of root elongation. These results suggest that At5PTase13 regulates the homeostasis of auxin, a key hormone controlling vascular development in plants.




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