Flowering plants have evolved various ge- netic mechanisms to circumvent the tendency for self- fertilization created by the close proximity of male and female reproductive organs in a bisexual flower. One such mecha- nism is gametophytic self-incompatibility, which allows the female reproductive organ, the pistil, to distinguish between self pollen and non-self pollen; self pollen is rejected, whereas non-self pollen is accepted for fertilization.
展开▼
