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Updated: Jul 1, 2025

Semi-High Throughput Screening for Potential Drought-tolerance in Lettuce Lactuca sativa Germplasm Collections
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Back to the future for drought tolerance.

Luis M Guadarrama-Escobar1, James Hunt1, Allison Gurung1

  • 1School of Agriculture, Food and Ecosystem Sciences (SAFES), University of Melbourne, Melbourne, Vic., 3010, Australia.

The New Phytologist
|March 2, 2024
PubMed
Summary
This summary is machine-generated.

Wild crop relatives offer untapped drought tolerance genes. A new high-throughput imaging method, using an image-based transpiration efficiency (iTE) index, aids in selecting drought-resilient crops for global agriculture.

Keywords:
de novo domesticationhigh‐throughput imagingstomatatranspiration efficiencywater use efficiencywild relatives

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Area of Science:

  • Agricultural Science
  • Plant Genetics
  • Climate Change Adaptation

Background:

  • Global agriculture faces increasing pressure to produce more food with limited resources.
  • Drought, worsened by climate change, is a major agricultural constraint, causing significant economic losses.
  • Wild crop relatives (e.g., wheat, barley) possess valuable drought tolerance genes but are underutilized due to selection challenges.

Purpose of the Study:

  • To propose a novel strategy for assessing and selecting drought tolerance in crops using high-throughput spectral imaging.
  • To explore the importance of sustained carbon fixation under drought stress.
  • To develop drought-tolerant prebreeding material by merging high-throughput phenotyping and de novo domestication.

Main Methods:

  • Utilizing multi-trait selection criteria based on high-throughput spectral images.
  • Developing an image-based transpiration efficiency (iTE) index using hyperspectral and thermal imaging.
  • Integrating iTE with other drought-related variables for selection.

Main Results:

  • The proposed iTE index, combined with other variables, facilitates the identification of accessions with diverse drought tolerance mechanisms.
  • High-throughput phenotyping and de novo domestication can be merged for effective prebreeding.
  • The strategy addresses challenges in managing undesirable traits and selecting heritable drought tolerance.

Conclusions:

  • A novel high-throughput imaging strategy, incorporating an image-based transpiration efficiency (iTE) index, can effectively identify drought-tolerant crop lines.
  • This approach facilitates the development of prebreeding material with enhanced drought resilience.
  • Leveraging wild crop relatives and advanced phenotyping offers a promising avenue for future crop improvement under drought stress.