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Arbuscular mycorrhiza colonization and development at suboptimal root zone temperature.

A Liu1, B Wang, C Hamel

  • 1Department of Natural Resource Sciences, McGill University, Macdonald Campus, 21111 Lakeshore Road, H9X 3V9, Ste-Anne-de-Bellevue, Quebec, Canada. liu_aiguo@hotmail.com

Mycorrhiza
|May 16, 2003
PubMed
Summary

Suboptimal root zone temperatures significantly inhibit arbuscular mycorrhizal (AM) fungi development and colonization in plants. While AM symbiosis benefits plant growth at optimal temperatures, low temperatures negatively impact AM formation and function.

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Area of Science:

  • Plant Science
  • Mycology
  • Environmental Science

Background:

  • Temperature is a critical environmental factor influencing biological processes.
  • Arbuscular mycorrhizae (AM) are symbiotic fungi that enhance plant nutrient uptake and growth.
  • Understanding the impact of temperature on AM symbiosis is crucial for agricultural and ecological applications.

Purpose of the Study:

  • To investigate the effects of varying root zone temperatures on the formation and development of arbuscular mycorrhizae (AM) in plants.
  • To assess the influence of temperature on plant growth, root colonization, and AM fungal activity.

Main Methods:

  • Two indoor experiments were conducted using sorghum and transformed carrot roots inoculated with Glomus intraradices.
  • Root zone temperatures were maintained at 10, 15, and 23 degrees C.

Related Experiment Videos

  • Measurements included root length, plant biomass, root colonization, mycelium length, spore number, and spore metabolic activity.

    • Main Results:

    • Suboptimal root zone temperatures (10 and 15 degrees C) reduced plant growth and significantly inhibited AM colonization.
    • AM colonization was markedly reduced at 15 degrees C and almost completely inhibited at 10 degrees C.
    • In vitro, G. intraradices sporulation and spore metabolic activity were reduced at lower temperatures, with significant impacts on root colonization.

    Conclusions:

    • Root zone temperature critically affects arbuscular mycorrhizal symbiosis, with suboptimal temperatures hindering fungal development and colonization.
    • While AM symbiosis generally benefits plant growth, low temperatures can negate these benefits and even negatively impact plant development.
    • A proposed negative interaction between AM hyphal growth and root growth at suboptimal temperatures explains reduced colonization rates.