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Developmental genetics of floral symmetry evolution
Jill C Preston1, Lena C Hileman
1Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045, USA.
Trends in Plant Science
|February 24, 2009
Summary
Floral zygomorphy, or asymmetrical flower shape, has evolved multiple times independently. Recent evidence shows that similar genes, CYCLOIDEA homologs, were repeatedly used in these parallel evolutionary transitions in plants.
Area of Science:
- Evolutionary Biology
- Developmental Genetics
- Plant Science
Background:
- Floral zygomorphy (asymmetrical flower shape) has evolved independently multiple times across plant lineages.
- The genetic mechanisms underlying these independent evolutionary transitions are not fully understood.
- In Antirrhinum majus (snapdragon), floral zygomorphy is regulated by CYCLOIDEA and DICHOTOMA TCP transcription factors.
Purpose of the Study:
- To review evidence for the parallel evolution of floral zygomorphy.
- To investigate the role of CYCLOIDEA homologs in independent zygomorphy evolution.
- To understand the developmental genetic basis of convergent evolution in plant floral development.
Main Methods:
- Literature review of studies on floral zygomorphy evolution.
- Comparative analysis of CYCLOIDEA gene family evolution across plant lineages.
- Examination of genetic pathways controlling floral development in different plant species.
Main Results:
- Evidence supports the parallel recruitment of CYCLOIDEA homologs in independent evolutionary transitions to zygomorphy.
- These transitions occurred in distantly related core eudicot lineages.
- TCP transcription factors play a conserved role in the evolution of floral asymmetry.
Conclusions:
- The independent evolution of floral zygomorphy often involves the parallel recruitment of conserved developmental genes.
- CYCLOIDEA homologs are key players in the repeated evolution of floral asymmetry in eudicots.
- This highlights the importance of gene duplication and regulatory evolution in driving convergent evolution.
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