Signalling pathways in pollen germination and tube growth |
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Authors: | R Malhó Q Liu D Monteiro C Rato L Camacho A Dinis |
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Institution: | (1) Departamento de Biologia Vegetal, Instituto de Ciência Aplicada e Tecnologia, Faculdade de Ciências, Universidade de Lisboa, Lisbon;(2) School of Biological and Biomedical Sciences, University of Durham, Durham;(3) Departamento de Botanica, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, Coimbra |
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Abstract: | Summary. Signalling is an integral component in the establishment and maintenance of cellular identity. In plants, tip-growing cells
represent an ideal system to investigate signal transduction mechanisms, and among these, pollen tubes (PTs) are one of the
favourite models. Many signalling pathways have been identified during germination and tip growth, namely, Ca2+, calmodulin, phosphoinositides, protein kinases, cyclic AMP, and GTPases. These constitute a large and complex web of signalling
networks that intersect at various levels such as the control of vesicle targeting and fusion and the physical state of the
actin cytoskeleton. Here we discuss some of the most recent advances made in PT signal transduction cascades and their implications
for our future research. For reasons of space, emphasis was given to signalling mechanisms that control PT reorientation,
so naturally many other relevant works have not been cited.
Correspondence and reprints: Departamento de Biologia Vegetal, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa,
Portugal. |
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Keywords: | : Calcium ion Calmodulin D-myo-Inositol-1 4 5-trisphosphate Phosphatidylinositol-4 5-bisphosphate Phosphatidic acid Secretion |
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