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Related Concept Videos

Competition02:34

Competition

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When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
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Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food.
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Updated: Mar 1, 2026

Author Spotlight: Optimizing Hairy Root-Based Transformation Protocols for Enhanced Efficiency in Brassicaceae
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EVOLUTION OF BRASSICA RAPA L. (CRUCIFERAE) POPULATIONS IN INTRA- AND INTERSPECIFIC COMPETITION.

T E Miller1

  • 1Department of Biological Science, Florida State University, Tallahassee, Florida, 32306-2043.

Evolution; International Journal of Organic Evolution
|June 2, 2017
PubMed
Summary
This summary is machine-generated.

Plant evolution accelerates under competition. Brassica rapa selected for flower number in intraspecific competition showed significant growth increases, demonstrating evolved plant development in competitive environments.

Keywords:
Brassica rapacompetitioninterspecific competitionintraspecific competitionphenotypic selectionplants

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Area of Science:

  • Plant evolutionary biology
  • Ecology
  • Agricultural science

Background:

  • Plant populations face diverse competitive pressures from neighbors of the same species (intraspecific) or different species (interspecific).
  • Understanding how selection for performance in competitive environments drives evolutionary change is crucial for predicting plant community dynamics and agricultural success.

Purpose of the Study:

  • To investigate the evolutionary responses of Brassica rapa to selection for enhanced performance under intraspecific and interspecific competition.
  • To determine if selection for competitive ability leads to changes in plant development and growth rates.

Main Methods:

  • Brassica rapa populations were subjected to three generations of selection for high flower number under either intraspecific or interspecific competition.
  • Control lines were maintained without selection for competitive traits.
  • Selected and control lines were grown in common environments to assess evolved growth and developmental differences.

Main Results:

  • Intraspecific selection significantly increased flower number by over 50% compared to controls and 19% over interspecific selection after two generations.
  • Selected lines, particularly under intraspecific competition, exhibited faster seedling growth in height and flower number.
  • No significant differences were observed in seed mass, emergence time, or photosynthetic rates, though biomass allocation varied.

Conclusions:

  • Evolutionary adaptation to competitive environments can occur through modifications in plant developmental strategies.
  • The rate and nature of evolutionary change in competitive ability differ between intraspecific and interspecific interactions.
  • Selection for competitive traits can lead to rapid, measurable changes in plant performance and development.