Write a note on pollen-pistil interaction.

Pollen-Pistil interaction

The pollen landing on stigma of pistil might be compatible or incompatible with the stigma. Therefore the acceptance or rejection of the pollen by stigma depends on the compatibility.

If the pollen & pistil are compatible with each other, following events will take place:

• Pistil accepts pollen
• Formation of pollen tube
• Pollen tube reaches ovary
• Pollen grains move into pollen tube
• Pollen tube enters ovule through micropyle
• Pollen tube enters a synergid through filiform apparatus
• Fertilization occurs

On the other hand, If the pollen & pistil are incompatible with each other, following events will take place:

• Pistil rejects pollen
• Prevents pollen tube growth
• Prevents fertilization

Therefore, Pollen-Pistil interaction can be defined as follows:

Pollen-pistil interaction is a dynamic process of pollen recognition followed by promotion or inhibition of the pollen. Chemical components of the pollen interact with those of the pistil.