Oecologia

, Volume 176, Issue 1, pp 1–10 | Cite as

Competing neighbors: light perception and root function

  • Pedro E. Gundel
  • Ronald Pierik
  • Liesje Mommer
  • Carlos L. Ballaré
Concepts, Reviews and Syntheses

Abstract

Plant responses to competition have often been described as passive consequences of reduced resource availability. However, plants have mechanisms to forage for favorable conditions and anticipate competition scenarios. Despite the progresses made in understanding the role of light signaling in modulating plant–plant interactions, little is known about how plants use and integrate information gathered by their photoreceptors aboveground to regulate performance belowground. Given that the phytochrome family of photoreceptors plays a key role in the acquisition of information about the proximity of neighbors and canopy cover, it is tempting to speculate that changes in the red:far-red (R:FR) ratio perceived by aboveground plant parts have important implications shaping plant behavior belowground. Exploring data from published experiments, we assess the neglected role of light signaling in the control of root function. The available evidence indicates that plant exposure to low R:FR ratios affects root growth and morphology, root exudate profiles, and interactions with beneficial soil microorganisms. Although dependent on species identity, signals perceived aboveground are likely to affect root-to-root interactions. Root systems could also be guided to deploy new growth predominantly in open areas by light signals perceived by the shoots. Studying interactions between above- and belowground plant–plant signaling is expected to improve our understanding of the mechanisms of plant competition.

Keywords

Plant competition Root growth Signal transduction Phytochrome Neighbor perception 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Pedro E. Gundel
    • 1
    • 2
  • Ronald Pierik
    • 3
  • Liesje Mommer
    • 4
  • Carlos L. Ballaré
    • 2
    • 5
  1. 1.Plant Production ResearchMTT Agrifood Research FinlandJokioinenFinland
  2. 2.Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Consejo Nacional de Investigaciones Científicas y TécnicasUniversidad de Buenos AiresBuenos AiresArgentina
  3. 3.Plant Ecophysiology, Institute of Environmental BiologyUtrecht UniversityUtrechtThe Netherlands
  4. 4.Nature Conservation and Plant Ecology GroupWageningen UniversityWageningenThe Netherlands
  5. 5.IIB-INTECH, Consejo Nacional de Investigaciones Científicas y TécnicasUniversidad Nacional de San MartínBuenos AiresArgentina

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