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Related Experiment Video

Updated: Apr 27, 2026

Measuring Fluxes of Mineral Nutrients and Toxicants in Plants with Radioactive Tracers
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Linking waterlogging tolerance with Mn²⁺ toxicity: a case study for barley.

X Huang1, S Shabala, L Shabala

  • 1School of Land and Food, University of Tasmania, Kings Meadows, Australia.

Plant Biology (Stuttgart, Germany)
|July 3, 2014
PubMed
Summary

Flooding severely impacts crops, but manganese (Mn2+) toxicity is a key, overlooked stressor. Targeting Mn2+ tolerance mechanisms can significantly improve waterlogging tolerance in barley breeding programs.

Keywords:
BreedingHordeum vulgareMn2+ toxicitychlorophyllsequestrationtissue tolerancewaterlogging tolerance

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Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Environmental Stress Biology

Background:

  • Flooding causes substantial crop yield losses globally, with significant economic impact.
  • Traditional breeding for waterlogging tolerance focused on anoxia, neglecting other critical factors like soil elemental toxicity.
  • Increased soil manganese (Mn2+) due to waterlogging can reach toxic levels, negatively affecting plant health.

Purpose of the Study:

  • To investigate the contribution of manganese (Mn2+) toxicity to overall waterlogging stress tolerance in barley.
  • To quantify the relationship between Mn2+ tolerance and waterlogging tolerance across different barley genotypes.

Main Methods:

  • Studied twenty barley (Hordeum vulgare) genotypes with varying waterlogging tolerance.
  • Assessed plant response to toxic levels (1 mM) of Mn2+ in the root zone.
  • Measured chlorophyll content and leaf Mn2+ concentration under stress conditions.

Main Results:

  • Waterlogging-tolerant barley genotypes maintained higher chlorophyll content under Mn2+ toxicity compared to sensitive ones.
  • Leaf Mn2+ concentration did not directly correlate with visible toxicity symptoms, indicating diverse tolerance mechanisms.
  • A significant positive correlation (r=0.60) was found between Mn2+ toxicity tolerance and waterlogging tolerance.

Conclusions:

  • Manganese (Mn2+) toxicity is a significant component of waterlogging stress in barley.
  • Breeding strategies for enhanced waterlogging tolerance can benefit from targeting Mn2+ tolerance mechanisms.
  • Understanding Mn2+ tolerance mechanisms (e.g., avoidance, tissue tolerance) is crucial for improving crop resilience.