Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest the method of pollination in such plants.

Self incompatibility and autogamy

The phenomenon in which the pollen from the anther of a flower fails to germinate on the stigma of the same flower is referred to as self incompatibility. This prevents autogamy.

Self incompatibility imposes restrictions on autogamy- reasons

● The stigma has machinery (pollen-pistil interaction) which can recognise an incompatible pollen (sometimes, pollens of the same flower) by chemical interaction governed by genetic mechanisms.
● If an incompatible pollen lands on the stigma of a flower in a plant, the germination of the pollen is rejected (pollen tube formation is not allowed).

Cross pollination

Method of pollination in self incompatible plants is cross pollination,when the stigma of a flower is pollinated with the pollen grains from a flower of another plant.