What does the pollen tube transport?

What is the function of the filiform apparatus during the entry of the pollen tube into the ovule?

In which cell's cytoplasm are both male gametes first released?

$A$: Initial growth of the pollen tube takes place at the expense of food present in the stigma and style.
$R$: The pollen tube travels intracellularly and chemotactically.

Where does the pollen tube develop?

Transmitting tissue is found in: