Transcriptomic and lipidomic profiles of glycerolipids during Arabidopsis flower development

Nakamura, Yuki and Teo, Norman Z. W. and Shui, Guanghou and Chua, Christine H. L. and Cheong, Wei-Fun and Parameswaran, Sriram and Koizumi, Ryota and Ohta, Hiroyuki and Wenk, Markus R. and Ito, Toshiro. (2014) Transcriptomic and lipidomic profiles of glycerolipids during Arabidopsis flower development. New phytologist : international journal of plant science, Vol. 203, H. 1. pp. 310-322.

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Official URL: http://edoc.unibas.ch/dok/A6288964

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Flower glycerolipids are the yet-to-be discovered frontier of the lipidome. Although ample evidence suggests important roles for glycerolipids in flower development, stage-specific lipid profiling in tiny Arabidopsis flowers is challenging. Here, we utilized a transgenic system to synchronize flower development in Arabidopsis. The transgenic plant PAP1::AP1-GR ap1-1 cal-5 showed synchronized flower development upon dexamethasone treatment, which enabled massive harvesting of floral samples of homogenous developmental stages for glycerolipid profiling. Glycerolipid profiling revealed a decrease in concentrations of phospholipids involved in signaling during the early development stages, such as phosphatidic acid and phosphatidylinositol, and a marked increase in concentrations of nonphosphorous galactolipids during the late stage. Moreover, in the midstage, phosphatidylinositol 4,5-bisphosphate concentration was increased transiently, which suggests the stimulation of the phosphoinositide metabolism. Accompanying transcriptomic profiling of relevant glycerolipid metabolic genes revealed simultaneous induction of multiple phosphoinositide biosynthetic genes associated with the increased phosphatidylinositol 4,5-bisphosphate concentration, with a high degree of differential expression patterns for genes encoding other glycerolipid-metabolic genes. The phosphatidic acid phosphatase mutant pah1 pah2 showed flower developmental defect, suggesting a role for phosphatidic acid in flower development. Our concurrent profiling of glycerolipids and relevant metabolic gene expression revealed distinct metabolic pathways stimulated at different stages of flower development in Arabidopsis.
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH)
09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Department of Medical Parasitology and Infection Biology (MPI) > Molecular Immunology (Pluschke)
UniBasel Contributors:Wenk, Markus
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Blackwell Science
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:07 Nov 2014 08:28
Deposited On:07 Nov 2014 08:28

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