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Pollen tube tip growth.

The New phytologist·2021

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Calcium Control of Pollen Tube Tip Growth.

The Biological Bulletin

|January 5, 2018

Summary

Calcium ions are crucial for pollen tube growth, but high levels inhibit it. A dual control system regulates calcium uptake and transport, ensuring proper tip growth and cellular function.

Area of Science:

Plant reproductive biology
Cellular physiology
Biochemistry

Background:

Calcium ions play a vital role in plant cell processes, including pollen tube elongation.
Understanding calcium's precise role is essential for comprehending plant reproduction and development.
Previous research indicates calcium's concentration-dependent effects on pollen tube growth.

Purpose of the Study:

To review the multifaceted role of calcium ions in pollen tube tip growth.
To elucidate the mechanisms of calcium regulation during pollen tube elongation.
To explore the functional requirements and cellular transport of calcium in this context.

Main Methods:

Literature review of existing research on calcium's role in pollen tube growth.

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Analysis of studies detailing calcium ion channels and cellular transport mechanisms.

Examination of the relationship between calcium concentration and growth inhibition/promotion.

Main Results:

Calcium ions are essential for pollen tube tip growth, with optimal function occurring within specific concentration ranges.
High calcium concentrations (above 10^-2 M) are inhibitory to pollen tube elongation.
Calcium influx is spatially restricted to the growing tip, creating an ionic current.
A dual control system involving localized calcium channels and organelle-mediated transport maintains appropriate calcium levels.

Conclusions:

Polarized tip growth is dependent on a dual calcium control system: localized influx and intracellular sequestration/transport.
This regulatory system ensures optimal conditions for cytoskeletal activity and vesicle fusion at the pollen tube tip.
The findings provide a comprehensive understanding of calcium's critical function in plant male gametophyte development.