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Xie B, Zhao Z, Wang X, Wang Q, Yuan X, Guo C, Xu L. Exogenous protectants alleviate ozone stress in Trifolium repens: Impacts on plant growth and endophytic fungi. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 215:109059. [PMID: 39178802 DOI: 10.1016/j.plaphy.2024.109059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2024] [Revised: 08/06/2024] [Accepted: 08/19/2024] [Indexed: 08/26/2024]
Abstract
Industrialization-driven surface ozone (O3) pollution significantly impairs plant growth. This study evaluates the effectiveness of exogenous protectants [3 mg L⁻1 abscisic acid (ABA), 400 mg L⁻1 ethylenediurea (EDU), and 80 mg L⁻1 spermidine (Spd)] on Trifolium repens subjected to O3 stress in open-top chambers, focusing on plant growth and dynamics of culturable endophytic fungal communities. Results indicate that O3 exposure adversely affects photosynthesis, reducing root biomass and altering root structure, which further impacts the ability of plant to absorb essential nutrients such as potassium (K), magnesium (Mg), and zinc (Zn). Conversely, the application of ABA, EDU, and Spd significantly enhanced total biomass and chlorophyll content in T. repens. Specifically, ABA and Spd significantly improved root length, root surface area, and root volume, while EDU effectively reduced leaves' malondialdehyde levels, indicating decreased oxidative stress. Moreover, ABA and Spd treatments significantly increased leaf endophytic fungal diversity, while root fungal abundance declined. The relative abundance of Alternaria in leaves was substantially reduced by these treatments, which correlated with enhanced chlorophyll content and photosynthesis. Concurrently, EDU and Spd treatments increased the abundance of Plectosphaerella, enhance the absorption of K, Ca, and Mg. In roots, ABA treatment increased the abundance of Paecilomyces, while Spd treatment enhanced the presence of Stemphylium, linked to improved nitrogen (N), phosphorus (P), and K uptake. These findings suggest that specific symbiotic fungi mitigate O3-induced stress by enhancing nutrient absorption, promoting growth. This study highlights the potential of exogenous protectants to enhance plant resilience against O3 pollution through modulating interactions with endophytic fungal communities.
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Affiliation(s)
- Bing Xie
- College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding, 071000, China.
| | - Zipeng Zhao
- College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding, 071000, China.
| | - Xiaona Wang
- College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding, 071000, China.
| | - Qi Wang
- College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding, 071000, China.
| | - Xiangyang Yuan
- Department of Ecology, School of Applied Meteorology, Nanjing University of Information Science & Technology (NUIST), Nanjing, 210044, China.
| | - Chang Guo
- College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding, 071000, China.
| | - Lang Xu
- College of Landscape Architecture and Tourism, Hebei Agricultural University, Baoding, 071000, China.
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Agathokleous E, Kitao M, Hoshika Y, Haworth M, Tang Y, Koike T. Ethylenediurea protects against ozone phytotoxicity not by adding nitrogen or controlling stomata in a stomata-unresponsive hybrid poplar. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 875:162672. [PMID: 36894106 DOI: 10.1016/j.scitotenv.2023.162672] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 03/01/2023] [Accepted: 03/02/2023] [Indexed: 06/18/2023]
Abstract
Ozone (O3) pollution is a persistent environmental issue worldwide, which causes widespread damage to vegetation, deteriorating plant health and reducing plant productivity. Ethylenediurea (EDU) is a synthetic chemical that has been widely applied in scientific studies as a protectant against O3 phytotoxicities. Despite four decades of active research, the exact mechanisms to explain its mode of action remain unclear. Here, we aimed to reveal whether EDU's phytoprotective property is due to its control over stomatal regulation and/or its action as a nitrogen (N) fertilizer, utilizing stomatal-unresponsive plants of a hybrid poplar (Populus koreana × trichocarpa cv. Peace) grown in a free-air O3-concenctration enrichment (FACE) facility. Plants were treated with water (WAT), EDU (400 mg L-1), or EDU's constitutive amount of N every nine days, and exposed to ambient (AOZ) or elevated (EOZ) O3 during a growing season (June-September). EOZ led to extensive foliar injuries (but protected against rust disease), lower photosynthetic rate (A), impaired dynamics of responses of A to changes in light intensity, and smaller total plant leaf area. EDU protected against common phytotoxicities caused by EOZ without inducing stomatal closure, since stomatal conductance (gs) was generally unresponsive to the experimental treatments. EDU also modulated the dynamic response of A to light fluctuations under O3 stress. N addition acted as a fertilizer but did not satisfactorily protect plants against O3 phytotoxicities. The results suggest that EDU protects against O3 phytotoxicity not by adding N or controlling stomata, which provides a new insight into our understanding of the mode of action of EDU as a protectant against O3 phytotoxicity.
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Affiliation(s)
- Evgenios Agathokleous
- Research Center for Global Changes and Ecosystem Carbon Sequestration & Mitigation, School of Applied Meteorology, Nanjing University of Information Science and Technology (NUIST), Nanjing 210044, Jiangsu, China; Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Hokkaido, Japan; Hokkaido Research Center, Forestry and Forest Products Research Institute (FFPRI), Sapporo 062-8516, Japan.
| | - Mitsutoshi Kitao
- Hokkaido Research Center, Forestry and Forest Products Research Institute (FFPRI), Sapporo 062-8516, Japan
| | - Yasutomo Hoshika
- IRET-CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy
| | - Matthew Haworth
- National Research Council of Italy, Institute of Sustainable Plant Protection (CNR-IPSP), Via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy
| | - Yanhong Tang
- Department of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China; Institute of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Takayoshi Koike
- Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Hokkaido, Japan
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Wang Y, Xu S, Li B, Chen W, Li Y, He X, Wang N. Responses of spring leaf phenological and functional traits of two urban tree species to air warming and/or elevated ozone. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2022; 179:158-167. [PMID: 35358866 DOI: 10.1016/j.plaphy.2022.03.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/07/2022] [Accepted: 03/14/2022] [Indexed: 06/14/2023]
Abstract
Climate warming and surface ozone (O3) pollution are important global environmental issues today. However, the combined impacts of air warming and O3 on phenology and its functional traits of urban trees are still poorly understood. Here, an experiment was performed to explore the variations of the spring phenological and functional traits in leaves of Populus alba 'Berolinensis' and Forsythia suspensa under ambient air (15.8 °C, 35.7 ppb), increased air temperature (IT, ambient air temperature + 2 °C, 17.9 °C), elevated O3 (EO, ambient air O3 concentrations + 40 ppb, 77.4 ppb), and their combined treatments (17.7 °C, 74.5 ppb). Our results showed that: IT advanced the beginning of leaf bud expansion phase of P. alba 'Berolinensis' and F. suspensa for 6 d and 5 d, respectively, increased leaf unfolding rate, leaf area and dry weight, and enhanced photosynthesis and antioxidative enzyme activities. EO delayed the beginning of leaf bud expansion phase of P. alba 'Berolinensis' for 5 d, decreased leaf area and biomass, and inhibited photosynthesis and caused oxidative damage of plant leaves. Compared to EO, the combined treatment advanced the spring phenophase, increased growth and induced the higher level of photosynthetic rate and antioxidative enzymes activities in plant leaves, which indicated that the positive effects of increased temperature (17.7 °C) alleviated the inhibition of growth and photosynthesis induced by ozone. Our findings can provide a theoretical reference for predicting the adaptation of functional traits of the two trees blossomed early under warming and O3 pollution at spring phenological stage.
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Affiliation(s)
- Yijing Wang
- CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Sheng Xu
- CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Shenyang Arboretum, Chinese Academy of Sciences, Shenyang, 110016, China.
| | - Bo Li
- CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Wei Chen
- CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Shenyang Arboretum, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Yan Li
- CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Shenyang Arboretum, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Xingyuan He
- CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Shenyang Arboretum, Chinese Academy of Sciences, Shenyang, 110016, China.
| | - Nan Wang
- CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China; University of Chinese Academy of Sciences, Beijing, 100049, China
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Shang B, Fu R, Agathokleous E, Dai L, Zhang G, Wu R, Feng Z. Ethylenediurea offers moderate protection against ozone-induced rice yield loss under high ozone pollution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:151341. [PMID: 34728207 DOI: 10.1016/j.scitotenv.2021.151341] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 10/19/2021] [Accepted: 10/27/2021] [Indexed: 06/13/2023]
Abstract
Tropospheric ozone (O3) is the main phytotoxic air pollutant threatening food security, while ethylenediurea (EDU) can effectively mitigate O3-induced crop yield loss. EDU's mode of action, however, remains unclear, and the underlying physiological mechanisms of mitigating O3-induced crop yield loss are poorly understood. We cultivated hybrid rice seedlings under two O3 treatments (NF, nonfiltered ambient air; and NF60, ambient air plus 60 ppb O3) and sprayed foliage with 0 or 450 ppm EDU every ten days and determine photosynthesis-related traits, biomass indicators, and yield components. We found that EDU significantly increased the leaf nitrogen (N) allocation to photosynthesis (NP) and the grain N accumulation, while the grain N accumulation was positively correlated with NP and root biomass. EDU significantly increased the rice yield mainly by increasing the individual grain weight rather than the number of panicles and grains. While EDU protected from yield loss, the degree of protection was only 31% under NF60 treatment, thus EDU was unable to offer complete protection under high O3 pollution. These results will be conducive to a better understanding of the EDU protection mechanism and better application of EDU under high O3 pollution in the future.
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Affiliation(s)
- Bo Shang
- Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China
| | - Rao Fu
- Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China
| | - Evgenios Agathokleous
- Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China
| | - Lulu Dai
- Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China; Rural Energy and Environment Agency, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Guoyou Zhang
- Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China
| | - Rongjun Wu
- Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China
| | - Zhaozhong Feng
- Key Laboratory of Agrometeorology of Jiangsu Province, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, China.
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Wang Y, Xu S, Zhang W, Li Y, Wang N, He X, Chen W. Responses of growth, photosynthesis and related physiological characteristics in leaves of Acer ginnala Maxim. to increasing air temperature and/or elevated O 3. PLANT BIOLOGY (STUTTGART, GERMANY) 2021; 23 Suppl 1:221-231. [PMID: 33527649 DOI: 10.1111/plb.13240] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 01/12/2021] [Accepted: 01/21/2021] [Indexed: 05/26/2023]
Abstract
Regional warming and atmospheric ozone (O3 ) pollution are two of the most important environmental issues, and commonly coexist in many areas. Both factors have an intense impact on plants. However, little information is available on the combined and interactive effects of air warming and elevated O3 concentrations on physiological characteristics of plants. To explore this issue, we studied variations in growth, photosynthesis and physiological characteristics of leaves of Acer ginnala seedlings exposed to control (ambient temperature and O3 ), increasing air temperature (ambient temperature + 2 °C), elevated O3 (ambient O3 concentration + 40 ppb) and a combination of the two abiotic factors at different phenological stages by using open-top chambers. The results showed that increasing air temperature had no significant effect on growth, but increased photosynthesis and antioxidant enzyme activity at the leaf unfolding and defoliation stages. In contrast, elevated O3 decreased growth and photosynthesis and caused oxidative stress injury in A. ginnala leaves at each phenological stage. The combination of increasing air temperature and elevated O3 improved growth and net photosynthetic rates of tested plants and alleviated the oxidative stress compared to O3 alone. Our findings demonstrated that moderate warming was beneficial to A. ginnala at leaf unfolding and defoliation stages, and alleviated the adverse effects of O3 stress on growth, photosynthesis and the antioxidant system. These results will provide a theoretical reference and scientific basis for the adaptation and response of A. ginnala under regional air warming and atmospheric O3 pollution.
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Affiliation(s)
- Y Wang
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
- University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - S Xu
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
- University of the Chinese Academy of Sciences, Beijing, 100049, China
- Chinese Academy of Sciences Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China
| | - W Zhang
- College of Environment, Shenyang University, 110044, China
| | - Y Li
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
- Shenyang Arboretum, Chinese Academy of Sciences, Shenyang, 110016, China
| | - N Wang
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
- University of the Chinese Academy of Sciences, Beijing, 100049, China
| | - X He
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
- University of the Chinese Academy of Sciences, Beijing, 100049, China
- Chinese Academy of Sciences Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China
- Shenyang Arboretum, Chinese Academy of Sciences, Shenyang, 110016, China
| | - W Chen
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China
- University of the Chinese Academy of Sciences, Beijing, 100049, China
- Chinese Academy of Sciences Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang, 110016, China
- Shenyang Arboretum, Chinese Academy of Sciences, Shenyang, 110016, China
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Saitanis CJ, Agathokleous E. Exogenous application of chemicals for protecting plants against ambient ozone pollution: What should come next? CURRENT OPINION IN ENVIRONMENTAL SCIENCE & HEALTH 2021; 19:100215. [PMID: 33073070 PMCID: PMC7553877 DOI: 10.1016/j.coesh.2020.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Elevated ground-level ozone (O3) pollution can adversely affect plants and inhibit plant growth and productivity, threatening food security and ecological health. It is therefore essential to develop measures to protect plants against O3-induced adverse effects. Here we summarize the current status of phytoprotection against O3-induced adverse effects and consider recent scientific and engineering advances, to provide a novel perspective for maximizing plant health while reducing environmental/ecological risks in an O3-polluted world. We suggest that nanoscience and nanotechnology can provide a new dimension in the protection of plants against O3-induced adverse effects, and recommend that new studies are based upon a green chemistry perspective.
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Affiliation(s)
- Costas J Saitanis
- Agricultural University of Athens, Lab of Ecology and Environmental Sciences, 75 Iera Odos Str., TK 11855, Athens, Greece
| | - Evgenios Agathokleous
- Key Laboratory of Agrometeorology of Jiangsu Province, Institute of Ecology, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044, China
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Masui N, Agathokleous E, Mochizuki T, Tani A, Matsuura H, Koike T. Ozone disrupts the communication between plants and insects in urban and suburban areas: an updated insight on plant volatiles. JOURNAL OF FORESTRY RESEARCH 2021; 32:1337-1349. [PMID: 33456272 PMCID: PMC7797194 DOI: 10.1007/s11676-020-01287-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 10/29/2020] [Indexed: 05/02/2023]
Abstract
UNLABELLED Plant-insect interactions are basic components of biodiversity conservation. To attain the international Sustainable Development Goals (SDGs), the interactions in urban and in suburban systems should be better understood to maintain the health of green infrastructure. The role of ground-level ozone (O3) as an environmental stress disrupting interaction webs is presented. Ozone mixing ratios in suburbs are usually higher than in the center of cities and may reduce photosynthetic productivity at a relatively higher degree. Consequently, carbon-based defense capacities of plants may be suppressed by elevated O3 more in the suburbs. However, contrary to this expectation, grazing damages by leaf beetles have been severe in some urban centers in comparison with the suburbs. To explain differences in grazing damages between urban areas and suburbs, the disruption of atmospheric communication signals by elevated O3 via changes in plant-regulated biogenic volatile organic compounds and long-chain fatty acids are considered. The ecological roles of plant volatiles and the effects of O3 from both a chemical and a biological perspective are presented. Ozone-disrupted plant volatiles should be considered to explain herbivory phenomena in urban and suburban systems. SUPPLEMENTARY INFORMATION The online version of this article contains supplementary material available at (10.1007/s11676-020-01287-4) to authorized users.
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Affiliation(s)
- Noboru Masui
- Graduate School of Agriculture, Hokkaido University, Sapporo, Japan
| | - Evgenios Agathokleous
- Key Laboratory of Agrometeorology of Jiangsu Province, Institute of Ecology, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044 People’s Republic of China
| | - Tomoki Mochizuki
- School of Food and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan
| | - Akira Tani
- School of Food and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan
| | - Hideyuki Matsuura
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Japan
| | - Takayoshi Koike
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Japan
- Research Center for Eco-Environmental Science, CAS, Beijing, 100085 People’s Republic of China
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Agathokleous E, Kitao M, Wang X, Mao Q, Harayama H, Manning WJ, Koike T. Ethylenediurea (EDU) effects on Japanese larch: an one growing season experiment with simulated regenerating communities and a four growing season application to individual saplings. JOURNAL OF FORESTRY RESEARCH 2021; 32:2047-2057. [PMID: 33013142 PMCID: PMC7525765 DOI: 10.1007/s11676-020-01223-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 09/07/2020] [Indexed: 05/06/2023]
Abstract
Japanese larch (Larix kaempferi (Lamb.) Carr.) and its hybrid are economically important coniferous trees widely grown in the Northern Hemisphere. Ground-level ozone (O3) concentrations have increased since the pre-industrial era, and research projects showed that Japanese larch is susceptible to elevated O3 exposures. Therefore, methodologies are needed to (1) protect Japanese larch against O3 damage and (2) conduct biomonitoring of O3 in Japanese larch forests and, thus, monitor O3 risks to Japanese larch. For the first time, this study evaluates whether the synthetic chemical ethylenediurea (EDU) can protect Japanese larch against O3 damage, in two independent experiments. In the first experiment, seedling communities, simulating natural regeneration, were treated with EDU (0, 100, 200, and 400 mg L-1) and exposed to either ambient or elevated O3 in a growing season. In the second experiment, individually-grown saplings were treated with EDU (0, 200 and 400 mg L-1) and exposed to ambient O3 in two growing seasons and to elevated O3 in the succeeding two growing seasons. The two experiments revealed that EDU concentrations of 200-400 mg L-1 could protect Japanese larch seedling communities and individual saplings against O3-induced inhibition of growth and productivity. However, EDU concentrations ≤ 200 mg L-1 did offer only partial protection when seedling communities were coping with higher level of O3-induced stress, and only 400 mg EDU L-1 fully protected communities under higher stress. Therefore, we conclude that among the concentrations tested the concentration offering maximum protection to Japanese larch plants under high competition and O3-induced stress is that of 400 mg EDU L-1. The results of this study can provide a valuable resource of information for applied forestry in an O3-polluted world.
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Affiliation(s)
- Evgenios Agathokleous
- Key Laboratory of Agrometeorology of Jiangsu Province, Institute of Applied Ecology, Nanjing University of Information Science and Technology (NUIST), Nanjing, 210044 People’s Republic of China
- Division of Environment and Resources Research, Research Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589 Japan
- Hokkaido Research Center, Forestry and Forest Products Research Institute (FFPRI), Sapporo, 062-8516 Japan
| | - Mitsutoshi Kitao
- Hokkaido Research Center, Forestry and Forest Products Research Institute (FFPRI), Sapporo, 062-8516 Japan
| | - Xiaona Wang
- Division of Environment and Resources Research, Research Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589 Japan
- College of Landscape Architecture and Tourism, Hebei Agricultural University, No. 2596 Lekai South Street, Lianchi District, Baoding, 071000 People’s Republic of China
| | - Qiaozhi Mao
- Division of Environment and Resources Research, Research Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589 Japan
- College of Resources and Environment, Southwest University, Chongqing, 400700 People’s Republic of China
| | - Hisanori Harayama
- Ecophysiology Laboratory, Department of Plant Ecology, Forestry and Forest Products Research Institute (FFPRI), Matsunosato-1, Tsukuba, 305-8687 Japan
| | - William J. Manning
- Department of Plant, Soil and Insect Sciences, University of Massachusetts, 80 Campus Center Way, Amherst, MA 01003 USA
| | - Takayoshi Koike
- Division of Environment and Resources Research, Research Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589 Japan
- Shenzhen Graduate School of Environment and Energy, Peking University, Shenzhen, 518055 People’s Republic of China
- Research Center for Eco-Environmental Science, Chinese Academy of Science, Beijing, 100085 People’s Republic of China
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