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Developing a high-throughput phenotyping method for oxidative stress tolerance in barley roots.

Haiyang Wang1, Lana Shabala1, Meixue Zhou1

  • 1Tasmanian Institute of Agriculture, University of Tasmania, Hobart, TAS 7001 Australia.

Plant Methods
|February 19, 2019
PubMed
Summary

Salinity stress impacts global agriculture. New high-throughput assays for oxidative stress tolerance in barley roots offer a viable phenotyping alternative for breeding improved salinity tolerance in crops.

Keywords:
BarleyOxidative stressPhenotypingRoot growth assaySalinityViability staining

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Area of Science:

  • Plant Science
  • Agricultural Science
  • Genetics

Background:

  • Salinity affects over 20% of global agricultural land, causing significant economic losses and threatening food security.
  • Advanced molecular breeding for salinity tolerance is hindered by challenges in accurate plant phenotyping.
  • A link exists between salinity and oxidative stress tolerance, with a key quantitative trait locus (QTL) for reactive oxygen species (ROS) control in barley roots identified.

Purpose of the Study:

  • To evaluate high-throughput viability and root growth assays as alternatives to the microelectrode ion flux estimation (MIFE) method for phenotyping salinity tolerance in barley.
  • To assess the correlation between oxidative stress tolerance and overall salinity tolerance in barley varieties.

Main Methods:

  • Two high-throughput phenotyping methods were tested: viability assay and root growth assay.
  • Viability staining experiments assessed H2O2-triggered root cell death in barley.
  • Root growth assays measured relative root length (RRL) in barley under varying H2O2 concentrations.

Main Results:

  • A dose-dependent H2O2-induced loss of root cell viability was observed, with salt-sensitive varieties exhibiting greater damage.
  • The greatest difference in RRL between contrasting barley varieties was found at 1 mM H2O2.
  • A significant negative correlation was reported between reduced RRL and overall salinity tolerance under oxidative stress.

Conclusions:

  • Viability and root growth assays provide a convenient, high-throughput method for screening barley germplasm for oxidative stress tolerance.
  • These methods can aid in identifying root-based genes that regulate ion homeostasis and enhance salinity tolerance.
  • The findings have potential applications for improving salinity tolerance in barley and possibly other crop species.