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Xochitl Granados-Aguilar1,2, Verónica Reyes-Galindo1,3, Gustavo I Giles-Pérez1

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Scientists mapped genes in Abies religiosa to understand ozone tolerance in Mexican forests. This research identifies key genes and pathways for managing conifer resistance to air pollution.

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Area of Science:

  • Genomics
  • Plant Science
  • Ecology

Background:

  • Abies religiosa forests in Mexico are vital for ecosystem services but threatened by ozone pollution.
  • Ozone exposure causes premature senescence and decline in these important peri-urban forests.

Purpose of the Study:

  • To construct a saturated linkage map for Abies religiosa.
  • To identify genes associated with ozone tolerance and understand their regulation.

Main Methods:

  • Genotyping of 182 megagametophytes for 9,702 single nucleotide polymorphisms (SNPs).
  • Construction of a 12-linkage group (LG) map spanning 1,567.88 cM.
  • Differential gene expression and co-expression analyses in trees exposed to varying ozone levels.

Main Results:

  • A saturated linkage map with 12 LGs was generated, locating 5,881 coding genes.
  • Eight genes showed differential expression with increased ozone levels.
  • Co-expression analysis revealed functional gene clustering related to ozone tolerance, particularly in LGs 5, 8, and 10.

Conclusions:

  • Identified novel metabolic and defense pathways involved in conifer ozone tolerance.
  • Provides a foundation for developing molecular strategies to enhance ozone resistance in peri-urban Abies religiosa forests.