Small Genome Size Ensures Adaptive Flexibility for an Alpine Ginger.

Area of Science:

• Plant biology
• Evolutionary biology
• Genomics

Background:

• Genome size variation is a key evolutionary question.
• Intraspecific genome size variation and its adaptive role are poorly understood.
• Roscoea tibetica presents a model for studying genome size adaptation.

Purpose of the Study:

• To investigate the role of intraspecific genome size variation in adaptation.
• To explore the influence of environmental factors and geography on genome size.
• To examine the relationship between genome size and stomatal traits.

Main Methods:

• Genome size measured using flow cytometry in 53 Roscoea tibetica populations.
• Stomatal size and density analyzed in wild and common garden settings.
• Statistical analyses to correlate genome size with environmental factors and stomatal traits.

Main Results:

• Genome size variability positively correlated with most environmental factors, negatively with solar radiation.
• Environmental factors significantly influenced genome size variation more than geography.
• Stomatal traits correlated with genome size in the wild but not common garden; smaller genomes showed greater trait plasticity.

Conclusions:

• Intraspecific genome size in Roscoea tibetica has evolved adaptively in response to environmental stress.
• Smaller genome size appears advantageous for alpine adaptation.
• Genome size influences phenotypic plasticity of stomatal traits in response to environmental changes.