Modulation of endocytosis in pollen tube growth by phosphoinositides and phospholipids |
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Authors: | D Monteiro P Castanho Coelho C Rodrigues L Camacho H Quader R Malhó |
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Institution: | (1) Instituto de Ciência Aplicada e Tecnologia, Faculdade de Ciências, Universidade de Lisboa, Lisboa;(2) School of Biological and Biomedical Sciences, University of Durham, Durham;(3) Institute of General Botany, University of Hamburg, Hamburg |
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Abstract: | Summary. In plants, tip-growing cells represent an ideal system to investigate signal transduction mechanisms, and among those, pollen
tubes are one of the favourite models. Many signalling pathways have been identified during germination and tip growth, namely,
Ca2+, calmodulin, phosphoinositides, cyclic AMP, and GTPases. Not surprisingly, the apical secretory machinery, essential for
tip growth, seems to be an intersection point for all these pathways. Recently, the phospholipid phosphatidic acid was also
suggested to actively participate in the control of endo- and exocytosis and to interfere with the correct positioning of
the actin cytoskeleton. Phosphatidic acid seems to act concertedly with the phosphoinositides phosphatidylinositol 4,5-bisphosphate
and D-myo-inositol 1,4,5-trisphosphate. Here we review previous data and discuss additional evidence that these three molecules have
a combined action modulating both the actin cytoskeleton and the apical secretory machinery. We further discuss how these
findings can be integrated into a working model for pollen tube apical secretion that contemplates the existence of a rapid
endocytosis mechanism.
Correspondence and reprints: Instituto de Ciência Aplicada e Tecnologia, Faculdade de Ciências, Universidade de Lisboa, Campo
Grande, 1749-016 Lisboa, Portugal. |
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Keywords: | : Calcium Endocytosis Exocytosis D-myo-Inositol 1 4 5-trisphosphate Phosphatidylinositol 4 5-bisphosphate Phosphatidic acid |
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