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Agriculture

Harvester Ants Select Durum Wheat Genotypes Based on Genetic and Phenotypic Variation

Strategic Insights

— 1 min read

Researchers from Institut Agro Montpellier, in collaboration with other institutions, conducted a study to investigate the biotic interactions between harvester ants and durum wheat. The study found that harvester ants exhibited genotype-specific preferences in durum wheat, associated with a major quantitative trait loci (QTL) on chromosome 2A. The research provides new insights into the role of plant-insect dynamics in agroecosystems and the evolutionary history of crop species.

Key Takeaways:

  • The study identified a significant QTL on chromosome 2A explaining 21% of the variation in predation rate by harvester ants (Messor barbarus) on durum wheat (Triticum turgidum ssp. durum).
  • The QTL region contains a 3.6 Mb chromosomal inversion and 46 candidate genes, including a MYB transcription factor potentially involved in regulating cuticle and chemical traits.
  • The study conducted a cafeteria experiment with 208 spikes from 26 genotypes, placed at the entrances of eight ant nests, which validated the genetic findings and showed that harvester ants preferentially removed spikes from genotypes carrying the identified allele.
  • Spike traits, such as shorter spikes, were more likely to be harvested, but seed morphology and protein content did not significantly affect ant preference.
  • The study provides the first evidence of ant-mediated selective pressure in a cereal crop and opens new perspectives on plant-insect dynamics in agroecosystems.

Statistics:

  • 180 genetically diverse durum wheat inbred lines were used in the field experiment.
  • 208 spikes from 26 genotypes were used in the cafeteria experiment.
  • The QTL on chromosome 2A explained 21% of the variation in predation rate.
  • The QTL region contained 46 candidate genes.
  • Harvester ants preferentially removed longer spikes (88% of spikes from genotypes > 2 cm compared to 22% from genotypes < 2 cm).

Sources:

  • A La Carte Seed Harvesting: Messor barbarus Ants Select Durum Wheat Genotypes. Ecology and Evolution, 2025,15(10):n/a-n/a. (Ecology and Evolution - http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2045-7758)
  • [References omitted as they are already included in the source list]

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