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The evolution of plant nuclear genes
M T Clegg1, M P Cummings, M L Durbin
1Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA.
Summary
Recombination drives plant evolution by influencing gene family dynamics and molecular diversity. It facilitates the creation of new genes and allelic variations within species, impacting transposable elements.
Area of Science:
- Plant molecular evolution
- Genomics
- Population genetics
Background:
- Analysis of plant nuclear multigene families provides insights into evolutionary processes.
- Key gene families studied include ribulose-1,5-bisphosphate carboxylase (rbcS), chalcone synthase (Chs), and alcohol dehydrogenases (Adh).
- Limited data on plant transposable elements are also considered.
Purpose of the Study:
- To analyze the evolutionary dynamics of major plant nuclear multigene families.
- To investigate the rates of gene recruitment, duplication, and divergence.
- To understand the role of recombination in generating molecular diversity and shaping evolution.
Main Methods:
- Comparative analysis of gene families (rbcS, Chs, Adh).
- Examination of evolutionary data for plant transposable elements.
- Molecular population genetic studies of Adh and Chs genes.
Main Results:
- New Chs and rbcS genes are recruited approximately 10 times faster than Adh genes.
- Duplication and functional divergence are common in Chs genes during flowering plant evolution.
- Recombination is a significant factor in generating allelic diversity and driving divergence after gene duplication.
Conclusions:
- Recombination is a pervasive force across all levels of plant evolution.
- It influences gene family dynamics, molecular diversity within species, and transposable element evolution.
- Adaptive evolution plays a complex role in divergence following gene duplication events.