Pollen tubes are an excellent model for the understanding of plant cell behavior.

Nevertheless, several aspects have already been identified as central in the process of pollen tube growth.

He was the first to observe the pollen tube.

The pollen tube does not directly reach the ovary in a straight line.

The pollen tube passes through the wall by way of structures called apertures.

Pollen tubes, as most biological systems, are influenced by electrical stimulus.

The pollen tube of most seed plants acts as a passageway.

The pollen tube is an excellent model for the understanding of electrotropism and plant cell behavior in general.

As the pollen tube grows, it makes its way from the stigma, down the style and into the ovary.

The pollen tube has an unusual kind of growth; it extends exclusively at its apex.

Then it germinates, and grows a long pollen tube.

A pollen tube is part of the male gametophyte of seed plants.

Another report states that pollen tubes do not change growth direction under AC electric fields.

In some cases the style is responsible for self incompatibility, causing pollen tubes to fail.

Pollen tubes, for instance, align their polar growth with respect to an exogenous electric field.

In angiosperms, only a pollen tube enters the micropyle.

There are also microsystem-based assays to assess and quantify pollen tube behavior.

From here, a pollen tube seeks out the female gametophyte and if successful, fertilization will occur.

During germination, the tube cell elongates into a pollen tube.

Studies have shown that in some species, at least, the pollen tube is directed to the micropyle of the ovule by the style.

These are separate by definition, channeling the pollen tubes that invade them into only one carpel.