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Small Genome Size Ensures Adaptive Flexibility for an Alpine Ginger.

Qing-Song Xiao1, Tomáš Fér2, Wen Guo1

  • 1State Key Laboratory of Vegetation Structure, Function and Construction, Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China, School of Ecology and Environmental Science, Yunnan Key Laboratory of Plant Reproductive Adaptation and Evolutionary Ecology, Institute of Biodiversity, Yunnan University, Kunming 650500, China.

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PubMed
Summary

Intraspecific genome size variation in Roscoea tibetica is driven by environmental factors, not geography. Smaller genome size aids adaptation to alpine habitats, influencing stomatal traits.

Keywords:
Roscoea tibeticaadaptationcommon gardenenvironmental factorsintraspecific genome sizestomatal traits

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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.