Non-self- and self-recognition models in plant self-incompatibility.

Area of Science:

• Plant reproductive biology
• Molecular genetics
• Evolutionary biology

Background:

• Self-incompatibility (SI) is a key mechanism in flowering plants preventing self-fertilization and promoting outcrossing.
• Understanding SI's molecular basis offers insights into plant mating system evolution.

Purpose of the Study:

• To compare known SI systems based on molecular mechanisms, evolutionary history, and modes of evolution.
• To re-evaluate controversies in haplotype evolution within gametophytic SI systems.
• To explore the implications of non-self-recognition models for SI evolution.

Main Methods:

• Comparative analysis of molecular mechanisms across different SI systems.
• Review of evolutionary histories and modes of SI evolution.
• Integration of recent findings on non-self-recognition.

Main Results:

• SI systems can be classified into non-self-recognition and self-recognition types.
• Non-self-recognition models provide new perspectives on gametophytic SI in Solanaceae.
• Transitions from self-compatibility (SC) to SI appear more frequent than previously assumed.

Conclusions:

• Reversible transitions between SI and SC are crucial for plant adaptation to environmental changes.
• The evolutionary dynamics of SI are complex and involve frequent shifts between compatibility states.