Question

What stimulates growth of pollen tube?

Answer 1

The interaction between the stigma-style and the pollen grain is a vital piece that contributes to the pollen tube growth. The elongation of the tube is achieved with elongation of the cytoskeleton ( It is a complex network of interlinking filaments and tubules that extend throughout the cytoplasm), from the nucleus to the plasma membraneand it extends from the tip, which is regulated by high levels of calcium in the cytosol.

The calcium levels help the synaptic vesicles in the membranes grow and extend at the tip. Polypeptides found in the style also regulate growth of tube and specific peptides that play a role in signaling for growth have been identified. Hence we can say polypetides that is found on stigma style stimulates the growth of the pollen tube, which enters through the style to the ovary.