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What is self incompatibility ? Why does ...

What is self incompatibility ? Why does self -pollination not lead to seed formation in self -incompatible species ?

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In some flowers the pollen grains do not germinate on the pistil of same flower . This is called self incompatibility . In such cases the pollen grains do not germinate and produce male gametes and hence fertilisation does not occur . So seeds are not produced in self incompatible flowers
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Assertion : Self-incompatibility is a genetic mechanism which prevents self-pollination and thereby fertilisation by inhibiting either pollen germination or pollen tube growth in the pistil. Reason : In gametophytic self-incompatibility, the incompatibility reaction is determined by the genotype of the sporophytic tissue of the plant from which the pollen is derived.