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Polarized cell growth in higher plants.
Elucidation of the interactions and of the dynamics of these different components is providing unique insight into the mechanisms of polarized growth. Expand
Calcium: A Central Regulator of Plant Growth and Development
  • P. Hepler
  • Biology, Medicine
  • The Plant Cell Online
  • 1 August 2005
Today no one questions the assertion that Ca2+ is a crucial regulator of growth and development in plants. The myriad processes in which this ion participates is large and growing and involves nearlyExpand
Growing Pollen Tubes Possess a Constitutive Alkaline Band in the Clear Zone and a Growth-dependent Acidic Tip
These studies not only demonstrate that proton gradients exist, but that they may be intimately associated with polarized pollen tube growth. Expand
This work focuses on the recent developments in pollen biology that help to understand how the male gamete survives and accomplishes its successful delivery to the ovule of the sperm to effect sexual reproduction. Expand
Actin polymerization is essential for pollen tube growth.
Actin microfilaments, which are prominent in pollen tubes, have been implicated in the growth process; however, their mechanism of action is not well understood. In the present work we have usedExpand
Pectin Methylesterase, a Regulator of Pollen Tube Growth1[w]
Results from in vitro growth analysis and immunolocalization studies provide support for the idea that the pro-region acts as an intracellular inhibitor of PME activity, thereby preventing premature deesterification of pectins. Expand
Pollen tube growth is coupled to the extracellular calcium ion flux and the intracellular calcium gradient: effect of BAPTA-type buffers and hypertonic media.
The findings provide evidence that growing pollen tubes have open Ca2+ channels in their tip and that these channels become inactivated in nongrowing tubes and the studies with elevated sucrose support the view that stretching of the apical plasma membrane contributes to the maintenance of the Ca2 + signal. Expand
The Regulation of Actin Organization by Actin-Depolymerizing Factor in Elongating Pollen Tubes Online version contains Web-only data. Article, publication date, and citation information can be found
A Ser-6-to-Asp conversion abolished the interaction between NtADF1 and F-actin in elongating pollen tubes and reduced its inhibitory effect on pollen tube growth significantly, suggesting that phosphorylation at Ser- 6 may be a prominent regulatory mechanism for this pollen ADF. Expand
Control of pollen tube growth: role of ion gradients and fluxes.
Attention is given to the targets for the ions, for example, the secretory system, the cytoskeleton, the cell wall, in an attempt to provide a global understanding of pollen tube growth, giving special attention to the role of ions, especially calcium and protons. Expand
Pollen Tube Growth and the Intracellular Cytosolic Calcium Gradient Oscillate in Phase while Extracellular Calcium Influx Is Delayed.
Ion influx appears to follow growth, with the effect that the rate of growth at a given point determines the magnitude of the ion influx ~11 sec later. Expand