Geographical Parthenogenesis in Alpine and Arctic Plants

Area of Science:

• Evolutionary Biology
• Plant Sciences
• Reproductive Biology

Background:

• Geographical parthenogenesis describes asexual organisms occupying larger, more northern ranges than sexual relatives.
• Case studies confirm this pattern in alpine and arctic plants, but causal factors remain unclear.

Purpose of the Study:

• To investigate the evolutionary and ecological factors driving geographical parthenogenesis in plants.
• To evaluate classical evolutionary theories explaining the distribution of asexual versus sexual plants.

Main Methods:

• Review of recent research on plant families exhibiting geographical parthenogenesis.
• Analysis of ecological studies on climate tolerance and reproductive strategies.
• Evaluation of genetic and epigenetic factors influencing distribution.

Main Results:

• Uniparental reproduction in apomictic plants facilitates faster colonization of larger, northern areas.
• Polyploidy contributes to the spatial separation of sexual and asexual cytotypes.
• Apomicts show greater tolerance to cold climates, with epigenetic and phenotypic plasticity aiding niche occupation.
• Genotypic diversity is less critical for asexual plant distribution.
• The Red Queen hypothesis lacks support in plant studies.

Conclusions:

• Apomixis provides advantages for rapid colonization and survival in harsh climates, explaining geographical parthenogenesis.
• The persistence of sexual reproduction in alpine flora may be linked to abiotic stresses like light stress.
• Further research is needed to understand constraints on apomixis origin and the persistence of sexuality.