Biology / Unit 11 Bio 2611 short lesson, about 20 seconds
Self-Incompatibility Mechanisms
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The idea
Self-incompatibility genes at the S locus block a plant's own pollen from germinating through its stigma and style, forcing cross-pollination.
In practice
In self-incompatible species, an enzyme secreted by the style degrades a pollen tube's RNA once it recognizes matching, self, genetic markers.
Where people slip
Self-incompatibility is a genetic mechanism acting after pollen lands, distinct from structural barriers like stamens and carpels maturing at different times.
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