A model of gender modification in gynodioecious plants

Area of Science:

• Evolutionary biology
• Plant reproductive strategies
• Mating system evolution

Background:

• Gynodioecious populations feature both female and hermaphroditic individuals.
• Understanding the evolution of sex allocation in plants is crucial for mating system dynamics.
• Nucleo-cytoplasmic inheritance and population subdivision can influence evolutionary trajectories.

Purpose of the Study:

• To investigate the conditions favoring increased male function allocation in hermaphrodites within gynodioecious populations.
• To explore the evolutionary stability of hermaphroditism under specific genetic and population structures.
• To analyze the impact of nucleo-cytoplasmic sex determination on mating system evolution.

Main Methods:

• Development of a theoretical model.
• Analysis of sex determination assuming nucleo-cytoplasmic inheritance.
• Incorporation of population subdivision to maintain polymorphism.
• Investigation of modifier invasion dynamics for sex allocation.

Main Results:

• Modifiers promoting increased male function allocation can invade, but only under restrictive conditions.
• Hermaphroditism is not an evolutionary stable strategy when these modifiers successfully invade.
• The model highlights specific scenarios where the balance of sex allocation shifts.

Conclusions:

• The evolution of increased male function in hermaphrodites is contingent on specific genetic and population structures.
• Hermaphroditism's stability is challenged under conditions favoring male-biased sex allocation.
• This study provides insights into the complex evolution of plant mating systems and sex allocation.