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A high-throughput protocol for testing heat-stress tolerance in pollen.

Chenchen Zhao1, Abu Bakar Siddique1, Ce Guo1

  • 1Tasmanian Institute of Agriculture, University of Tasmania, Prospect, TAS 7250 Australia.

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|March 10, 2025
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Summary

Researchers developed a rapid, high-throughput method using PCR to assess plant pollen viability under heat stress. This technique identifies optimal temperatures for screening heat-tolerant pollen, aiding crop breeding for climate resilience.

Keywords:
Heat stressHordeum vulgare L.Pollen germinationPollen tube developmentTriticum aestivum L.

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Area of Science:

  • Plant Science
  • Agricultural Science
  • Molecular Biology

Background:

  • Pollen viability is essential for plant fertilization but highly sensitive to heat stress.
  • Existing methods for assessing pollen heat tolerance are labor-intensive, space-consuming, and often limited to single temperatures.
  • A need exists for efficient, multi-temperature screening methods to improve crop heat tolerance.

Purpose of the Study:

  • To develop an easy, reliable, and high-throughput method for measuring pollen viability across a range of temperatures.
  • To identify the optimal temperature range for screening pollen with high heat-stress tolerance.
  • To enable rapid assessment of pollen response to thermal stress for crop improvement.

Main Methods:

  • Wheat (Triticum aestivum) pollen was incubated in a 96-well plate with sucrose medium.
  • A gradient PCR machine was used to expose pollen to a simultaneous range of temperatures (21.9–47°C) for 4 hours.
  • Pollen morphology, germination, and tube growth were analyzed using light microscopy and a specialized image analysis pipeline.

Main Results:

  • The PCR-based method enabled high-throughput screening of pollen viability under diverse thermal conditions.
  • The approach provided rapid, reliable, and precise analysis of temperature effects on pollen.
  • Data on pollen performance across a temperature gradient were efficiently generated.

Conclusions:

  • The developed method offers a significant advancement for assessing pollen heat-stress tolerance.
  • This technique is applicable to various plant species, facilitating breeding programs.
  • It aids in identifying genetic resources for enhancing crop resilience to heat stress.