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Cao H, Ding R, Du T, Kang S, Tong L, Chen J, Gao J. A meta-analysis highlights the cross-resistance of plants to drought and salt stresses from physiological, biochemical, and growth levels. PHYSIOLOGIA PLANTARUM 2024; 176:e14282. [PMID: 38591354 DOI: 10.1111/ppl.14282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/12/2024] [Accepted: 03/20/2024] [Indexed: 04/10/2024]
Abstract
In nature, drought and salt stresses often occur simultaneously and affect plant growth at multiple levels. However, the mechanisms underlying plant responses to drought and salt stresses and their interactions are still not fully understood. We performed a meta-analysis to compare the effects of drought, salt, and combined stresses on plant physiological, biochemical, morphological and growth traits, analyze the different responses of C3 and C4 plants, as well as halophytes and non-halophytes, and identify the interactive effects on plants. There were numerous similarities in plant responses to drought, salt, and combined stresses. C4 plants had a more effective antioxidant defense system, and could better maintain above-ground growth. Halophytes could better maintain photosynthetic rate (Pn) and relative water content (RWC), and reduce growth as an adaptation strategy. The responses of most traits (Pn, RWC, chlorophyll content, soluble sugar content, H2O2 content, plant dry weight, etc.) to combined stress were less-than-additive, indicating cross-resistance rather than cross-sensitivity of plants to drought and salt stresses. These results are important to improve our understanding of drought and salt cross-resistance mechanisms and further induce resistance or screen-resistant varieties under stress combination.
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Affiliation(s)
- Heli Cao
- Center for Agricultural Water Research in China, China Agricultural University, Beijing, China
- State Key Laboratory of Efficient Utilization of Agricultural Water Resources, Beijing, China
- National Field Scientific Observation and Research Station on Efficient Water Use of Oasis Agriculture, Wuwei, Gansu Province, China
| | - Risheng Ding
- Center for Agricultural Water Research in China, China Agricultural University, Beijing, China
- State Key Laboratory of Efficient Utilization of Agricultural Water Resources, Beijing, China
- National Field Scientific Observation and Research Station on Efficient Water Use of Oasis Agriculture, Wuwei, Gansu Province, China
| | - Taisheng Du
- Center for Agricultural Water Research in China, China Agricultural University, Beijing, China
- State Key Laboratory of Efficient Utilization of Agricultural Water Resources, Beijing, China
- National Field Scientific Observation and Research Station on Efficient Water Use of Oasis Agriculture, Wuwei, Gansu Province, China
| | - Shaozhong Kang
- Center for Agricultural Water Research in China, China Agricultural University, Beijing, China
- State Key Laboratory of Efficient Utilization of Agricultural Water Resources, Beijing, China
- National Field Scientific Observation and Research Station on Efficient Water Use of Oasis Agriculture, Wuwei, Gansu Province, China
| | - Ling Tong
- Center for Agricultural Water Research in China, China Agricultural University, Beijing, China
- State Key Laboratory of Efficient Utilization of Agricultural Water Resources, Beijing, China
- National Field Scientific Observation and Research Station on Efficient Water Use of Oasis Agriculture, Wuwei, Gansu Province, China
| | - Jinliang Chen
- Center for Agricultural Water Research in China, China Agricultural University, Beijing, China
- State Key Laboratory of Efficient Utilization of Agricultural Water Resources, Beijing, China
- National Field Scientific Observation and Research Station on Efficient Water Use of Oasis Agriculture, Wuwei, Gansu Province, China
| | - Jia Gao
- Center for Agricultural Water Research in China, China Agricultural University, Beijing, China
- State Key Laboratory of Efficient Utilization of Agricultural Water Resources, Beijing, China
- National Field Scientific Observation and Research Station on Efficient Water Use of Oasis Agriculture, Wuwei, Gansu Province, China
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Meng Q, Yan M, Zhang J, Zhang Q, Zhang X, Yang Z, Luo Y, Wu W. Humic acids enhance salt stress tolerance associated with pyrroline 5-carboxylate synthetase gene expression and hormonal alteration in perennial ryegrass ( Lolium perenne L.). FRONTIERS IN PLANT SCIENCE 2023; 14:1272987. [PMID: 38186607 PMCID: PMC10766811 DOI: 10.3389/fpls.2023.1272987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Accepted: 11/23/2023] [Indexed: 01/09/2024]
Abstract
Humic acid (HA) has been used as an important component in biostimulant formulations to enhance plant tolerance to salt stress, but the mechanisms underlying are not fully understood. This study was to investigate the physiological and molecular mechanisms of HA's impact on salt stress tolerance in perennial ryegrass (Lolium perenne L.). The two types of HA were extracted from weathered coal samples collected from Wutai County (WTH) and Jingle County (JLH) of Shanxi Province, China. The grass seedlings subjected to salt stress (250 mM NaCl) were treated with HA solutions containing 0.01% WTH (W/V) or 0.05% JLH (W/V), respectively. The HA treatments improved leaf photosynthetic rate (Pn), transpiration rate (Tr), and stomatal conductance (Gs) and reduced leaf oxidative injury (lower malondialdehyde content) and Pro and intercellular CO2 concentrations in salt-stressed perennial ryegrass. The HA treatments also reversed the decline in antioxidative enzymes ascorbate peroxidase (APX), catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) activity and improved growth and anti-senescence hormones indole-3-acetic acid (IAA) and brassinosteroid (BR). The HA treatments reduced the relative expression of P5CS and its downstream products proline (Pro) and the stress defense hormones abscisic acid (ABA), salicylic acid (SA), jasmonic acid (JA), and polyamines (PA). The results of this study indicate that the application of HAs may improve salt stress tolerance by regulating P5CS gene expression related to osmotic adjustment and increasing the activity of antioxidant enzymes and anti-senescence hormones in perennial ryegrass.
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Affiliation(s)
- Qiuxia Meng
- Key Laboratory for Soil Environment and Nutrient Resources of Shanxi Province, Shanxi Agricultural University, Taiyuan, China
- Institute of Eco-environment and Industrial Technology, Shanxi Agricultural University, Taiyuan, China
| | - Min Yan
- Key Laboratory for Soil Environment and Nutrient Resources of Shanxi Province, Shanxi Agricultural University, Taiyuan, China
- Institute of Eco-environment and Industrial Technology, Shanxi Agricultural University, Taiyuan, China
| | - Jiaxing Zhang
- Institute of Eco-environment and Industrial Technology, Shanxi Agricultural University, Taiyuan, China
| | - Qiang Zhang
- Key Laboratory for Soil Environment and Nutrient Resources of Shanxi Province, Shanxi Agricultural University, Taiyuan, China
- Institute of Eco-environment and Industrial Technology, Shanxi Agricultural University, Taiyuan, China
| | - Xunzhong Zhang
- School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA, United States
| | - Zhiping Yang
- Key Laboratory for Soil Environment and Nutrient Resources of Shanxi Province, Shanxi Agricultural University, Taiyuan, China
- Institute of Eco-environment and Industrial Technology, Shanxi Agricultural University, Taiyuan, China
| | - Yuan Luo
- Institute of Eco-environment and Industrial Technology, Shanxi Agricultural University, Taiyuan, China
| | - Wenli Wu
- Key Laboratory for Soil Environment and Nutrient Resources of Shanxi Province, Shanxi Agricultural University, Taiyuan, China
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Zahra N, Al Hinai MS, Hafeez MB, Rehman A, Wahid A, Siddique KHM, Farooq M. Regulation of photosynthesis under salt stress and associated tolerance mechanisms. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2022; 178:55-69. [PMID: 35276596 DOI: 10.1016/j.plaphy.2022.03.003] [Citation(s) in RCA: 62] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/12/2022] [Accepted: 03/03/2022] [Indexed: 05/24/2023]
Abstract
Photosynthesis is crucial for the survival of all living biota, playing a key role in plant productivity by generating the carbon skeleton that is the primary component of all biomolecules. Salinity stress is a major threat to agricultural productivity and sustainability as it can cause irreversible damage to photosynthetic apparatus at any developmental stage. However, the capacity of plants to become photosynthetically active under adverse saline conditions remains largely untapped. This study addresses this discrepancy by exploring the current knowledge on the impact of salinity on chloroplast operation, metabolism, chloroplast ultrastructure, and leaf anatomy, and highlights the dire consequences for photosynthetic machinery and stomatal conductance. We also discuss enhancing photosynthetic capacity by modifying and redistributing electron transport between photosystems and improving photosystem stability using genetic approaches, beneficial microbial inoculations, and root architecture changes to improve salt stress tolerance under field conditions. Understanding chloroplast operations and molecular engineering of photosynthetic genes under salinity stress will pave the way for developing salt-tolerant germplasm to ensure future sustainability by rehabilitating saline areas.
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Affiliation(s)
- Noreen Zahra
- Department of Botany, University of Agriculture, Faisalabad, 38040, Pakistan
| | - Marwa Sulaiman Al Hinai
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud 123, Oman
| | | | - Abdul Rehman
- Department of Agronomy, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur, 63100, Bahawalpur, Pakistan
| | - Abdul Wahid
- Department of Botany, University of Agriculture, Faisalabad, 38040, Pakistan
| | - Kadambot H M Siddique
- The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, 6001, Australia
| | - Muhammad Farooq
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud 123, Oman; The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, 6001, Australia.
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Identification of the Origins of Vadose-Zone Salinity on an Agricultural Site in the Venice Coastland by Ionic Molar Ratio Analysis. WATER 2020. [DOI: 10.3390/w12123363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Saltwater contamination seriously affects water quality and land productivity of reclaimed farmlands along the Venice Lagoon, Italy. To characterize the hydrogeochemical dynamics involved in this phenomenon, a three-year study was carried out in an experimental field located at the southern margin of the Venice Lagoon. Soil matric potential, quality of soil pore water and groundwater, and soil physical and chemical properties were monitored at five monitoring stations. Relationships between Cl−, Na+, Mg2+, Ca2+, K+, SO42−, Br− ionic concentrations, and electrical conductivity of the water samples with the soil characteristics (e.g., texture, exchangeable cations) were investigated. Soil water flux direction was calculated and related to ion concentrations. Moreover, specific molar ratios (Mg/Ca, Na/Cl, Cl/Br, and SO4/Cl) were calculated to identify the main drivers affecting salinity in the field. The study confirmed that the experimental site was strongly affected by soil and water salinity, and two major contamination dynamics were identified. The first one was mainly driven by seawater intrusion from the near lagoon and salty watercourses, while the second was derived by the interactions between the peaty soil and salts that were originally in place, since the area was only reclaimed a few decades ago. The latter highlighted the potentiality of the experimental field to become an acidic sulfate environment. Ionic ratios were implemented and proved to be an important tool for the identification of salinity origin.
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Mesophyll conductance: the leaf corridors for photosynthesis. Biochem Soc Trans 2020; 48:429-439. [DOI: 10.1042/bst20190312] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 01/25/2020] [Accepted: 01/30/2020] [Indexed: 12/15/2022]
Abstract
Besides stomata, the photosynthetic CO2 pathway also involves the transport of CO2 from the sub-stomatal air spaces inside to the carboxylation sites in the chloroplast stroma, where Rubisco is located. This pathway is far to be a simple and direct way, formed by series of consecutive barriers that the CO2 should cross to be finally assimilated in photosynthesis, known as the mesophyll conductance (gm). Therefore, the gm reflects the pathway through different air, water and biophysical barriers within the leaf tissues and cell structures. Currently, it is known that gm can impose the same level of limitation (or even higher depending of the conditions) to photosynthesis than the wider known stomata or biochemistry. In this mini-review, we are focused on each of the gm determinants to summarize the current knowledge on the mechanisms driving gm from anatomical to metabolic and biochemical perspectives. Special attention deserve the latest studies demonstrating the importance of the molecular mechanisms driving anatomical traits as cell wall and the chloroplast surface exposed to the mesophyll airspaces (Sc/S) that significantly constrain gm. However, even considering these recent discoveries, still is poorly understood the mechanisms about signaling pathways linking the environment a/biotic stressors with gm responses. Thus, considering the main role of gm as a major driver of the CO2 availability at the carboxylation sites, future studies into these aspects will help us to understand photosynthesis responses in a global change framework.
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Qiu R, Katul GG. Maximizing leaf carbon gain in varying saline conditions: An optimization model with dynamic mesophyll conductance. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 101:543-554. [PMID: 31571298 DOI: 10.1111/tpj.14553] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 09/10/2019] [Accepted: 09/20/2019] [Indexed: 06/10/2023]
Abstract
While the adverse effects of elevated salinity levels on leaf gas exchange in many crops are not in dispute, representing such effects on leaf photosynthetic rates (A) continues to draw research attention. Here, an optimization model for stomatal conductance (gc ) that maximizes A while accounting for mesophyll conductance (gm ) was used to interpret new leaf gas exchange measurements collected for five irrigation water salinity levels. A function between chloroplastic CO2 concentration (cc ) and intercellular CO2 concentration (ci ) modified by salinity stress to estimate gm was proposed. Results showed that with increased salinity, the estimated gm and maximum photosynthetic capacity were both reduced, whereas the marginal water use efficiency λ increased linearly. Adjustments of gm , λ and photosynthetic capacity were shown to be consistent with a large corpus of drought-stress experiments. The inferred model parameters were then used to evaluate the combined effects of elevated salinity and atmospheric CO2 concentration (ca ) on leaf gas exchange. For a given salinity level, increasing ca increased A linearly, but these increases were accompanied by mild reductions in gc and transpiration. The ca level needed to ameliorate A reductions due to increased salinity is also discussed using the aforementioned model calculations.
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Affiliation(s)
- Rangjian Qiu
- Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China
- Nicholas School of the Environment, Duke University, Durham, NC, 27708, USA
| | - Gabriel G Katul
- Nicholas School of the Environment, Duke University, Durham, NC, 27708, USA
- Department of Civil and Environmental Engineering, Duke University, Durham, NC, 27708, USA
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Perri S, Katul GG, Molini A. Xylem-phloem hydraulic coupling explains multiple osmoregulatory responses to salt stress. THE NEW PHYTOLOGIST 2019; 224:644-662. [PMID: 31349369 DOI: 10.1111/nph.16072] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Abstract
Salinity is known to affect plant productivity by limiting leaf-level carbon exchange, root water uptake, and carbohydrates transport in the phloem. However, the mechanisms through which plants respond to salt exposure by adjusting leaf gas exchange and xylem-phloem flow are still mostly unexplored. A physically based model coupling xylem, leaf, and phloem flows is here developed to explain different osmoregulation patterns across species. Hydraulic coupling is controlled by leaf water potential, ψl , and determined under four different maximization hypotheses: water uptake (1), carbon assimilation (2), sucrose transport (3), or (4) profit function - i.e. carbon gain minus hydraulic risk. All four hypotheses assume that finite transpiration occurs, providing a further constraint on ψl . With increasing salinity, the model captures different transpiration patterns observed in halophytes (nonmonotonic) and glycophytes (monotonically decreasing) by reproducing the species-specific strength of xylem-leaf-phloem coupling. Salt tolerance thus emerges as plant's capability of differentiating between salt- and drought-induced hydraulic risk, and to regulate internal flows and osmolytes accordingly. Results are shown to be consistent across optimization schemes (1-3) for both halophytes and glycophytes. In halophytes, however, profit-maximization (4) predicts systematically higher ψl than (1-3), pointing to the need of an updated definition of hydraulic cost for halophytes under saline conditions.
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Affiliation(s)
- Saverio Perri
- Masdar Institute, Khalifa University of Science and Technology, PO Box 54224, Abu Dhabi, United Arab Emirates
- Department of Civil Infrastructure and Environmental Engineering, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, United Arab Emirates
| | - Gabriel G Katul
- Nicholas School of the Environment, Duke University, Durham, NC, 27710, USA
- Department of Civil and Environmental Engineering, Duke University, Durham, NC, 27708, USA
| | - Annalisa Molini
- Masdar Institute, Khalifa University of Science and Technology, PO Box 54224, Abu Dhabi, United Arab Emirates
- Department of Civil Infrastructure and Environmental Engineering, Khalifa University of Science and Technology, PO Box 127788, Abu Dhabi, United Arab Emirates
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Bouraoui D, Cekstere G, Osvalde A, Vollenweider P, Rasmann S. Deicing Salt Pollution Affects the Foliar Traits and Arthropods' Biodiversity of Lime Trees in Riga's Street Greeneries. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00282] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Dewar R, Mauranen A, Mäkelä A, Hölttä T, Medlyn B, Vesala T. New insights into the covariation of stomatal, mesophyll and hydraulic conductances from optimization models incorporating nonstomatal limitations to photosynthesis. THE NEW PHYTOLOGIST 2018; 217:571-585. [PMID: 29086921 DOI: 10.1111/nph.14848] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 09/10/2017] [Indexed: 05/08/2023]
Abstract
Optimization models of stomatal conductance (gs ) attempt to explain observed stomatal behaviour in terms of cost--benefit tradeoffs. While the benefit of stomatal opening through increased CO2 uptake is clear, currently the nature of the associated cost(s) remains unclear. We explored the hypothesis that gs maximizes leaf photosynthesis, where the cost of stomatal opening arises from nonstomatal reductions in photosynthesis induced by leaf water stress. We analytically solved two cases, CAP and MES, in which reduced leaf water potential leads to reductions in carboxylation capacity (CAP) and mesophyll conductance (gm ) (MES). Both CAP and MES predict the same one-parameter relationship between the intercellular : atmospheric CO2 concentration ratio (ci /ca ) and vapour pressure deficit (VPD, D), viz. ci /ca ≈ ξ/(ξ + √D), as that obtained from previous optimization models, with the novel feature that the parameter ξ is determined unambiguously as a function of a small number of photosynthetic and hydraulic variables. These include soil-to-leaf hydraulic conductance, implying a stomatal closure response to drought. MES also predicts that gs /gm is closely related to ci /ca and is similarly conservative. These results are consistent with observations, give rise to new testable predictions, and offer new insights into the covariation of stomatal, mesophyll and hydraulic conductances.
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Affiliation(s)
- Roderick Dewar
- Plant Sciences Division, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
| | - Aleksanteri Mauranen
- Department of Physics, University of Helsinki, PO Box 68, Helsinki, FI-00014, Finland
| | - Annikki Mäkelä
- Department of Forest Sciences, University of Helsinki, PO Box 27, Helsinki, FI-00014, Finland
| | - Teemu Hölttä
- Department of Forest Sciences, University of Helsinki, PO Box 27, Helsinki, FI-00014, Finland
| | - Belinda Medlyn
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Timo Vesala
- Department of Physics, University of Helsinki, PO Box 68, Helsinki, FI-00014, Finland
- Department of Forest Sciences, University of Helsinki, PO Box 27, Helsinki, FI-00014, Finland
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Koyama K, Takemoto S. Morning reduction of photosynthetic capacity before midday depression. Sci Rep 2014; 4:4389. [PMID: 24633128 PMCID: PMC3955906 DOI: 10.1038/srep04389] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 02/28/2014] [Indexed: 11/09/2022] Open
Abstract
Midday depression of photosynthesis has important consequences for ecosystem carbon exchange. Recent studies of forest trees have demonstrated that latent reduction of photosynthetic capacity can begin in the early morning, preceding the midday depression. We investigated whether such early morning reduction also occurs in an herbaceous species, Oenothera biennis. Diurnal changes of the photosynthetic light response curve (measured using a light-emitting diode) and incident sunlight intensity were measured under field conditions. The following results were obtained: (1) the light-saturated photosynthetic rate decreased beginning at sunrise; (2) the incident sunlight intensity on the leaves increased from sunrise; and (3) combining (1) and (2), the net photosynthetic rate under natural sunlight intensity increased from sunrise, reached a maximum at mid-morning, and then showed midday depression. Our results demonstrate that the latent morning reduction of photosynthetic capacity begins at sunrise, preceding the apparent midday depression, in agreement with previous studies of forest trees.
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Affiliation(s)
- Kohei Koyama
- 1] Department of Life Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan [2] Department of Environmental Science, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
| | - Shuhei Takemoto
- The University of Tokyo Tanashi Forest, Graduate School of Agricultural & Life Sciences, 1-1-8 Midoricho, Nishitokyo, Tokyo 188-0002, Japan
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Buckley TN, Schymanski SJ. Stomatal optimisation in relation to atmospheric CO2. THE NEW PHYTOLOGIST 2014; 201:372-377. [PMID: 24124922 DOI: 10.1111/nph.12552] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Affiliation(s)
- Thomas N Buckley
- IA Watson Grains Research Centre, Faculty of Agriculture and Environment, The University of Sydney, Narrabri, NSW, 2390, Australia
| | - Stanislaus J Schymanski
- ETH Zürich, Soil and Terrestrial Environmental Physics, Universitätstrasse 16, 8092, Zürich, Switzerland
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