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Decoding drought tolerance from a genomic approach in Castanea sativa Mill.

A Perez-Rial1, P Castro1, A Solla2

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The Plant Genome
|November 10, 2025
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Developing a drought tolerance gene atlas for Castanea sativa (chestnut) is crucial for climate change adaptation. Researchers identified key genes, like those for oleosin-like proteins, offering new avenues for breeding drought-resistant chestnut trees.

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Area of Science:

  • Genomics
  • Plant Biology
  • Climate Change Adaptation

Background:

  • Climate change, characterized by extreme summer drought and heat, poses a significant threat to chestnut forests.
  • Genomic understanding of drought tolerance in Castanea sativa is vital for its adaptation to changing climatic conditions.
  • The absence of a reference genome has previously limited research in this area.

Purpose of the Study:

  • To construct a comprehensive drought tolerance gene atlas for Castanea sativa.
  • To identify candidate genes involved in drought response mechanisms.
  • To lay the groundwork for developing molecular markers for breeding and conservation.

Main Methods:

  • Leveraged public databases and high homology between Quercus and Castanea genera.
  • Employed a mapping approach using short-read sequence databases to identify candidate genes.
  • Validated candidate genes via Sanger sequencing for accurate reconstruction of coding sequences.

Main Results:

  • Successfully reconstructed coding sequences and identified genetic variability in Castanea sativa.
  • Discovered significant sequence differences in two genes: one encoding an oleosin-like protein and another a two-component response regulator.
  • These identified genes suggest a role in adaptive stress responses to drought.

Conclusions:

  • The developed gene atlas provides valuable insights into drought tolerance mechanisms in chestnut.
  • Identified genes are promising targets for future research and potential genetic markers for drought tolerance.
  • This work supports the development of molecular markers for targeted conservation and breeding strategies in Castanea sativa.