Elevated CO2 offsets the alteration of foliar chemicals (n-icosane, geranyl acetate, and elixene) induced by elevated O3 in three taxa of O3-tolerant eucalypts
Year: 2020
Type: article
Abstract: Eucalypts are important forest resources in southwestern China, and may be tolerant to elevated ground-level ozone (O3) concentrations that can negatively affect plant growth. High CO2may offset O3-induced effects by providing excess carbon to produce secondary metabolites or by inducing stomatal closure. Here, the effects of elevated CO2and O3on leaf secondary metabolites and other defense chemicals were studied by exposing seedlings ofEucalyptus globulus, E. grandis,andE. camaldulensis × E. degluptato a factorial combination of two levels of O3(< 10 nmol mol−1and 60 nmol mol−1) and CO2(ambient: 370 μmol mol−1and 600 μmol mol−1) in open-top field chambers. GC-profiles of leaf extracts illustrated the effect of elevated O3and the countering effect of high CO2on compounds in leaf epicuticular wax and essential oils, i.e.,n-icosane, geranyl acetate and elixene, compounds known as a first-line defense against insect herbivores.n-Icosane may be involved in tolerance mechanisms ofE. grandisand the hybrid, while geranyl acetate and elixene in the tolerance ofE. globulus. Elevated O3and CO2, singly or in combination, affected only leaf physiology but not biomass of various organs. Elevated CO2impacted several leaf traits, including stomatal conductance, leaf mass per area, carbon, lignin,n-icosane, geranyl acetate and elixene. Limited effects of elevated O3on leaf physiology (nitrogen,n-icosane, geranyl acetate, elixene) were commonly offset by elevated CO2. We conclude thatE. globulus,E. grandisand the hybrid were tolerant to these O3and CO2treatments, andn-icosane, geranyl acetate and elixene may be major players in tolerance mechanisms of the tested species.
Source: Journal of Forestry Research
Institutions: Hokkaido University, Ministry of Environment and Forestry, Republic of Indonesia, Southwest University, Nanjing University of Information Science and Technology, Tokyo University of Agriculture and Technology, Chinese Academy of Sciences, Peking University, Research Center for Eco-Environmental Sciences
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: hybrid
Estimated APC paid: $2,690
Funders: National Natural Science Foundation of China, China Scholarship Council, Nanjing University of Information Science and Technology, Nanjing University, Japan Society for the Promotion of Science, Japan Science and Technology Agency, Startup Foundation for Introducing Talent of Nanjing University of Information Science and Technology, Strategic International Collaborative Research Program
OpenAlex ID: W3025840728