Multiple CMS-restorer gene polymorphism in gynodioecious Plantago coronopus

Area of Science:

• Evolutionary biology
• Plant genetics
• Population genetics

Background:

• Gynodioecy, the co-occurrence of female and hermaphrodite plants, is influenced by male sterility inheritance.
• Cytoplasmic male sterility (CMS) and nuclear restorer genes are key components of this system.
• Existing theoretical models often simplify the genetic complexity of CMS-restorer interactions.

Purpose of the Study:

• To investigate the genetic complexity of male sterility in the gynodioecious species Plantago coronopus.
• To identify and characterize novel CMS-restorer polymorphisms.
• To understand the implications of complex CMS-restorer systems for gynodioecy evolution.

Main Methods:

• Genetic analysis of male sterility and fertility restoration in Plantago coronopus populations.
• Identification of cytoplasmic male sterility (CMS) types and their associated nuclear restorer genes.
• Investigating the inheritance patterns of multiple restorer alleles.

Main Results:

• Discovery of two new CMS-restorer polymorphisms in Plantago coronopus, bringing the total to four at the species level.
• Observation of three distinct CMS types co-occurring within a single population.
• Characterization of new CMS types exhibiting multilocus systems for male fertility restoration, involving both dominant and recessive restorer alleles.

Conclusions:

• The genetic architecture of male sterility in Plantago coronopus is more complex than previously assumed.
• The co-occurrence of multiple CMS-restorer systems with complex inheritance raises questions about their maintenance in natural populations.
• Findings necessitate revising theoretical models to account for intricate genetic interactions in gynodioecious systems.