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Pollen Tip Growth: Control of Cellular Morphogenesis Through Intracellular Trafficking

Chapter

Abstract

The control of cellular growth in pollen tubes occurs through the fine-tuning of intracellular transport and secretion processes. This does not only apply to the basic genesis of the cylindrical cell through polar expansion but also to the pollen tube’s specialized skills including its capacity to respond to directional guidance cues and its ability to perform invasive growth. The control of these specialized activities by intracellular trafficking occurs through the strategic deposition of cell wall material and cell wall modifying agents that soften or stiffen the wall with the aim to regulate the cell wall’s mechanical properties both in time and space. Directional and invasive growth of the pollen tube is crucial for successful sperm delivery and fertilization. The mechanisms underlying the regulation and logistics of the endomembrane trafficking in the pollen tube therefore have a direct impact on pollen tube elongation and male fertility. Here, we relate pollen tube morphogenesis and its biological functionality to the intracellular processes that control cellular growth behavior and allow the cell to respond to environmental cues.

Keywords

Pollen tube Tip growth Cell wall mechanics Vesicle trafficking Exocytosis 

Abbreviations

CalSs

Callose synthases

CESAs

Cellulose synthases A

FRAP

Fluorescence recovery after photobleaching

HG

Homogalacturonan

PGs

Polygalacturonases

PME

Pectin methyl esterase

PMEIs

Pectin methyl esterase inhibitors

RIPs

ROP-interacting partners

ROPs

Rho family of GTPases

SNAREs

Soluble NSF attachment protein receptors

SYP

Syntaxin of plants

TGN

Trans-Golgi network

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Department of Plant ScienceMcGill UniversityMontrealCanada

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