InsP3 in Plant Cells
D-myo-Inositol 1,4,5-trisphosphate (InsP3) is an important second messenger in eukaryotic cells. Although the phosphoinositide (PI) pathway has been well studied in plants, there is much that is not understood about PI-mediated signaling and there are fundamental differences between the plant and animal models. Many researchers have shown that plants produce InsP3 in response to multiple stimuli and that InsP3-mediated Ca2+ release is a component of plant signaling, although the candidate intracellular target of InsP3 in plants remains elusive. As plants are sessile organisms with multiple back-up systems, the InsP3-mediated signaling pathway may be one of the many signaling pathways in plants and its role may be more significant in specialized cells. This chapter provides an overview of InsP3 metabolism in plants, the current methods of analysis, and a review of the role of InsP3 in plants gathered from recent studies using mutants or transgenic plants with altered PI metabolism.
KeywordsGuard Cell Phosphatidic Acid Inositol Phosphate Inositol Polyphosphate Mammalian Type
Funding from the National Science Foundation and the US Department of Agriculture is gratefully acknowledged.
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