What is Gametophytic Self-incompatibility (GSI)? – Definition
This type of self incompatibility is controlled by genetic constitution of gametes. Pollen grains are unable to germinate on stigma with similar allele as that of pollen.
| Cross | Compatibility |
|---|---|
| S1S2 X S3S4 | Fully compatible |
| S1S2 X S1S3 | Partially compatible |
| S1S2 X S1S2 | Fully incompatible |
Examples of Gametophytic Self-incompatibility
potatoes, wild tomatoes, tobacco, roses, bajara, rye, sugar beet. Family wise, in Solanaceae, Scrophulariaceae, Poaceae, Fabaceae, Campanulaceae, Onagraceae, Papaveraceae and Rosaceae
Applications of Self-incompatibility
- In the production of hybrids
- To increase yield in some fruit trees by providing suitable pollinators
Sporophytic self incompatibility is the second type of homomorphic incompatibility. Another must read link in the concept of compatibility is Heteromorphic self incompatibility.