Question

Describe pollen-pistil interaction in detail.

Answer 1

Pollination refers to the falling of the pollen on the stigam and germination of the pollen grain to form a pollen tube. The arrival of a pollen grain on the stigma does not assure there will be fertilization. Interspecific incompatibility means there is failure of pollen from one species to germinate on the stigma of another species. Intraspecific incompatibility occurs within a species. Self-incompatibility is the incompatibility between the pollen and the stigma of the same individual. If the pollen and the stigma are compatible, the pollen absorbs the water (hydrates) from the stigma and the pollen tube emerges. The pollen tube grows down the style of the carpel toward the micropyle. This is necessary for the migration of the male gametes to the egg cell.