| Title: | Whole-plant compensatory responses of isoprene emission from hybrid poplar seedlings exposed to elevated ozone |
| Author(s): | Li S; Yuan X; Feng Z; Du Y; Agathokleous E; Paoletti E; |
| Address: | "School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China; School of Applied Meteorology, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Shuangqing Road 18, Beijing 100085, China. Electronic address: xyyuan@rcees.ac.cn. School of Applied Meteorology, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China. Electronic address: zhaozhong.feng@nuist.edu.cn. School of Applied Meteorology, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China. Institute of Research on Terrestrial Ecosystems, National Council of Research, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy" |
| DOI: | 10.1016/j.scitotenv.2021.150949 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "It is still unclear whether the responses of isoprene (ISO) emission to elevated O(3) vary with biological organization level (i.e. leaf and whole-plant). To study such responses and the possible reasons explaining their variation, we investigated the effect of O(3) (CF: charcoal-filtered ambient air; E-O(3): non-filtered ambient air enriched with O(3)) on ISO emission rate (ISO(rate)), net photosynthetic rate (Pn), leaf nitrogen and carbon contents, and leaf growth traits in poplar seedlings (Populus deltoides cv. 55/56 x P. deltoides cv. Imperial) during one growing season. Opposite effects of E-O(3) on Pn were found between upper leaves (positive effect) and lower leaves (negative effect). Compared to CF, E-O(3) significantly decreased leaf mass per area, number of leaves, and leaf biomass, but increased leaf nitrogen content and individual leaf size. In the framework of such compensatory responses, poplar seedlings further increased ISO(rate) in upper leaves and decreased ISO(rate) in lower leaves, thus preventing significant decrease in the overall whole-plant ISO(rate) by E-O(3). The measured whole-plant ISO(rate) also showed that the simplistic estimation approaches based on the linear regression between chlorophyll content indicated by soil plant analysis development meter (SPAD value) and leaf-level ISO(rate) could not accurately reflect the true response of whole plant to elevated O(3). For more accurate predictions, the potential ISO compensatory response to increasing O(3) concentration should be incorporated into the climate biogeochemical models related to ISO emission" |
| Keywords: | Butadienes Hemiterpenes *Ozone Photosynthesis Plant Leaves *Populus Seedlings Compensatory response Dynamic whole-plant enclosure Isoprene Poplar seedling Volatile organic compounds (VOCs); |
| Notes: | "MedlineLi, Shuangjiang Yuan, Xiangyang Feng, Zhaozhong Du, Yingdong Agathokleous, Evgenios Paoletti, Elena eng Netherlands 2021/10/17 Sci Total Environ. 2022 Feb 1; 806(Pt 4):150949. doi: 10.1016/j.scitotenv.2021.150949. Epub 2021 Oct 14" |
