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Variation and constraint in plant evolution and development.

S Kalisz1, E M Kramer

  • 1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA. kalisz@pitt.edu

Heredity
|February 3, 2007
PubMed
Summary
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Plant phenotypic variation and genetic constraint drive plant diversity. Understanding how these factors interact, including through genetic and epigenetic mechanisms, is key to plant evolution.

Area of Science:

  • Plant Biology
  • Evolutionary Genetics

Background:

  • Plants exhibit unique traits like sessile habit and modular growth.
  • Phenotypic variation and genetic constraint are crucial for plant diversity.

Purpose of the Study:

  • To review the interplay between phenotypic variation and genetic constraint in plants.
  • To examine the genetic basis of plant phenotypic variation and its constraints.

Main Methods:

  • Review of quantitative trait loci (QTL) studies in wild and domesticated plants.
  • Analysis of factors contributing to phenotypic variation (e.g., somatic mutations, epigenetics).
  • Examination of genetic constraint mechanisms (e.g., pleiotropy, canalization).

Main Results:

  • Most plant phenotypic traits are polygenic, with varying numbers and effects of loci.

Related Experiment Videos

  • Somatic mutations, plasticity, and epigenetic variation (e.g., methylation) increase phenotypic variation.
  • Genetic constraint, arising from pleiotropy or canalization, can direct evolutionary paths.

    • Conclusions:

    • Genetic constraint can be released by hybridization, genome duplication, and epigenetic remodeling.
    • Simultaneous operation of these processes influences the evolution of ecologically important plant traits.
    • Further research is needed to fully understand these complex interactions in plant evolution.