At5PTase 13 modulates cotyledon vein development through regulating auxin homeostasis

Lin, Wen-Hui, Wang, Yuan, Mueller-Roeber, Bernd, Brearley, Charles A. ORCID:, Xu, Zhi-Hong and Xue, Hong-Wei (2005) At5PTase 13 modulates cotyledon vein development through regulating auxin homeostasis. Plant Physiology, 139 (4). pp. 1677-1691. ISSN 1532-2548

Full text not available from this repository. (Request a copy)


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.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Groups > Plant Sciences
Faculty of Science > Research Groups > Molecular Microbiology
Depositing User: EPrints Services
Date Deposited: 01 Oct 2010 13:37
Last Modified: 20 Jul 2024 00:42
DOI: 10.1104/pp.105.067140

Actions (login required)

View Item View Item