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<p>Climate stress impacts on the Amazon Forest highlight the need to understand tree resilience mechanisms. Dry-season leaf turnover in this forest may have evolved to alleviate drought and herbivory stress, and volatile isoprenoid production protects against abiotic and biotic stresses, motivating investigation of their joint responses. We measured temperature and light responses of volatile isoprenoid emissions and photochemical activity traits in 12 brevideciduous and evergreen central Amazon Forest trees. Brevideciduous trees showed stronger increases in sesquiterpene and highly reactive monoterpene emissions with temperature. Brevideciduous isoprene emitters showed superior baseline photosynthetic performance, while evergreen non-emitters had the highest baseline stomatal conductance and thermal stability. By neglecting variability in leaf turnover strategies, a global isoprene emission model consistently overestimated isoprene fluxes. These findings reveal overlooked phenological controls on Amazonian volatile isoprenoid fluxes, challenging standard model parameterization and emphasizing leaf-level data to improve predictions of atmospheric chemistry and climate-vegetation feedback.</p>

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Coordinated volatile isoprenoid production and leaf turnover strategy protect central Amazon Forest trees against stress

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月25日

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  • Michelle Robin,
  • Vinícius F. de Souza,
  • Joseph Byron,
  • Ülo Niinemets,
  • Jonathan Williams,
  • Christine Römermann,
  • Flávio A. F. D’Oliveira,
  • Cléo Quaresma Dias-Junior,
  • José Francisco de Carvalho Gonçalves,
  • Maquelle N. Garcia,
  • Davieliton Pinho,
  • Bruce W. Nelson,
  • Eliane Gomes Alves

摘要

Climate stress impacts on the Amazon Forest highlight the need to understand tree resilience mechanisms. Dry-season leaf turnover in this forest may have evolved to alleviate drought and herbivory stress, and volatile isoprenoid production protects against abiotic and biotic stresses, motivating investigation of their joint responses. We measured temperature and light responses of volatile isoprenoid emissions and photochemical activity traits in 12 brevideciduous and evergreen central Amazon Forest trees. Brevideciduous trees showed stronger increases in sesquiterpene and highly reactive monoterpene emissions with temperature. Brevideciduous isoprene emitters showed superior baseline photosynthetic performance, while evergreen non-emitters had the highest baseline stomatal conductance and thermal stability. By neglecting variability in leaf turnover strategies, a global isoprene emission model consistently overestimated isoprene fluxes. These findings reveal overlooked phenological controls on Amazonian volatile isoprenoid fluxes, challenging standard model parameterization and emphasizing leaf-level data to improve predictions of atmospheric chemistry and climate-vegetation feedback.