Assertion: Self-incompatibility is a genetic mechanism that prevents self-pollen from the same flower or other flowers of the same plant from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.
Reason: In gametophytic self-incompatibility, the incompatibility is determined by the genotype of the sporophytic tissue of the plant from which the pollen is derived.
Assertion: Self-incompatibility is a genetic mechanism that prevents self-pollen from the same flower or other flowers of the same plant from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.
Reason: In gametophytic self-incompatibility, the incompatibility is determined by the genotype of the sporophytic tissue of the plant from which the pollen is derived.
The correct option is B Assertion is true but reason is false
Self-incompatibility means the inability of the pollen from a flower to germinate on the stigma of the flower. Depending on the origin of factors determining the mating types two categories of self-incompatibility have been recognised.
i) Gametophytic self-incompatibility (GSI): The incompatibility process is determined by the genotype of the male gametophyte i.e. pollen itself.
ii) Sporophytic self-incompatibility (SSI): The incompatibility process is controlled by the genotype of the sporophytic tissue of the plant from which the pollen is derived.
Self-incompatibility means the inability of the pollen from a flower to germinate on the stigma of the flower. Depending on the origin of factors determining the mating types two categories of self-incompatibility have been recognised.
i) Gametophytic self-incompatibility (GSI): The incompatibility process is determined by the genotype of the male gametophyte i.e. pollen itself.
ii) Sporophytic self-incompatibility (SSI): The incompatibility process is controlled by the genotype of the sporophytic tissue of the plant from which the pollen is derived.
