Abstract
Aims
Phenolics can help plants mitigate stress of adverse environments. Elevated CO2 (eCO2) and arbuscular mycorrhizal fungi (AMF) may improve phenolics synthesis, however, the contribution of eCO2 to phenolics in plants colonized by AMF under heavy metal exposure is still unclear.
Methods
We investigated the effect of eCO2 (285 ppm above ambient CO2) on phenolic acids and flavonoids in black locust (Robinia pseudoacacia L.) grown in cadmium (Cd)-contaminated soils under Funneliformis mosseae (FM) colonization using 13C isotope tracer technique.
Results
Elevated CO2 significantly enhanced leaf and root Cd by 25.7% and 38.7%, respectively, and reduced total Cd by 36.7% in rhizosphere soils under FM colonization. Total phenolic acids decreased by 48.5% under eCO2 + FM relative to FM colonization. Elevated CO2 significantly decreased gallic acid, chlorogenic acid, p-hydroxybenzoic acid, caffeic acid, p-coumaric acid, ferulic acid, robinin, quercetin, kaempferol, and acacetin by 52.2%, 45.1%, 9.7%, 89.1%, 45.2%, 24.8%, 26.2%, 13.5%, 32.6%, and 34.1% under FM colonization, respectively, and the contribution of + 285 ppm CO2 to these compounds was 0.15, 0.33, 0.74, 0.14, 0.62, 0.38, 0.14, 0.23, 0.10, and 0.17 µg g−1 DW, respectively. The contribution decreased under FM colonization except for to chlorogenic acid, and the contribution was the most to total phenolic acids. Phenylalanine ammonia-lyase and nitrogen significantly affected phenolic acids and flavonoids synthesis.
Conclusions
The results could provide some insights into the contribution of eCO2 to plant resistance to heavy metals and plant sequestering heavy metals under AMF colonization.
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Data Availability
The datasets are available upon reasonable request.
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Acknowledgements
This work was jointly supported by the National Natural Science Foundation of China (grant Nos. 31870582 and 31270665) and the Project Supported by Shaanxi Key Laboratory of Land Consolidation of China (Program No. 2019TD-01).
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Liangyu Huang performed experiments, analyzed data, and wrote the manuscript. Xia Jia planned and designed the research and edited and reviewed the manuscript. Yonghua Zhao, Xiaojuan Feng, Xuelian Yang, Chunyan Zhang, and Yufeng Gao provided some help for the experiments.
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Huang, L., Jia, X., Zhao, Y. et al. Effects of elevated CO2 on phenolics in black locust seedlings inoculated with arbuscular mycorrhizal fungi under cadmium pollution by 13C isotopic tracer technique. Plant Soil 494, 547–566 (2024). https://doi.org/10.1007/s11104-023-06303-0
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DOI: https://doi.org/10.1007/s11104-023-06303-0