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Related Concept Videos

Formation of Species01:31

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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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Updated: Mar 18, 2026

Manipulation of Ploidy in Caenorhabditis elegans
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Plant adaptive radiation mediated by polyploid plasticity in transcriptomes.

Rie Shimizu-Inatsugi1, Aika Terada2,3,4, Kyosuke Hirose5

  • 1Department of Evolutionary Biology and Environmental Studies and Department of Plant and Microbial Biology, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.

Molecular Ecology
|June 30, 2016
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Summary

Polyploid species exhibit broad environmental tolerance by flexibly using parental gene expression patterns. This plasticity allows adaptation to diverse conditions, a key factor in their speciation and radiation.

Keywords:
advantages and disadvantages of polyploidizationecological speciationgeneralistgenome duplicationspecialistwater-usage gradients

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Area of Science:

  • Plant biology
  • Evolutionary genetics
  • Ecology

Background:

  • Polyploid species often inhabit diverse environments, but the molecular basis for this broad tolerance is poorly understood.
  • Polyploid plasticity hypothesis suggests allopolyploids may adopt parental expression patterns based on environmental cues.
  • Hydrological niche segregation along soil moisture and waterlogging gradients is a key factor in plant adaptation.

Purpose of the Study:

  • To investigate the molecular basis of environmental tolerance in allopolyploid species.
  • To test the polyploid plasticity hypothesis in Cardamine species.
  • To understand the role of hydrological gradients in allopolyploid speciation.

Main Methods:

  • Comparative analysis of diploid and allotetraploid Cardamine species' habitats and environmental tolerance.
  • Genomewide expression profiling using Arabidopsis microarrays under dry and wet conditions.
  • Hierarchical clustering of gene expression patterns to identify parental influence in allopolyploids.

Main Results:

  • Allotetraploid Cardamine flexuosa and Cardamine scutata showed wide environmental tolerance, unlike their specialist diploid parents.
  • Gene expression patterns in C. flexuosa mirrored C. hirsuta in dry conditions and C. amara in wet conditions.
  • Allopolyploids exhibited lower gene induction levels compared to diploid species, indicating potential disadvantages from fixed heterozygosity.

Conclusions:

  • Allopolyploid plasticity allows adaptation to fluctuating environments, supporting the polyploid plasticity hypothesis.
  • Recurrent allopolyploid speciation along hydrological gradients drives niche differentiation and reproductive isolation.
  • Cardamine allopolyploids serve as a model for studying ecological speciation and adaptive radiation at the molecular level.