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      Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau

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          Abstract

          Warming and Nitrogen (N) deposition are key global changes that may affect eco-physiological process of territorial plants. In this paper, we examined the effects of warming, N deposition, and their combination effect on the physiological performances of Leymus secalinus. Four treatments were established in an alpine meadow of Qinghai-Tibetan plateau: control (CK), warming (W), N deposition (N), and warming plus N deposition (NW). Warming significantly decreased the photosynthetic rate ( A net ), stomatal conductance ( g s ), intercellular CO 2 concentration ( C i ), and transpiration rate ( T r ), while N deposition and warming plus N deposition significantly increased those parameters of L. secalinus. Warming significantly increased the VPD and L s , while N deposition and warming plus N deposition had a significant positive effect. Warming negatively reduced the leaf N content, Chla, Chlb, and total Chl content, while N deposition significantly promoted these traits. Warming, N deposition, and their combination significantly increased the activity of SOD, POD, and CAT. Besides, warming and warming plus N deposition significantly increased the MDA content, while N deposition significantly decreased the MDA content. N deposition and warming plus N deposition significantly increased the Rubisco activity, while warming showed no significant effect on Rubisco activity. N deposition and warming plus N deposition significantly increased the Fv/ Fm, ΦPSII, qP, and decreased NPQ, while warming significantly decreased the Fv/ Fm, ΦPSII, qP, and increased NPQ. N deposition strengthened the relations between g s , Chl, Chla, Chlb, Rubisco activity, and A net . Under warming, only g s showed a significantly positive relation with A net . Our findings suggested that warming could impair the photosynthetic potential of L. secalinus enhanced by N deposition. Additionally, the combination of warming and N deposition still tend to lead positive effects on L. secalinus.

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          Most cited references63

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          Increased activity of northern vegetation inferred from atmospheric CO2 measurements

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            Drought-inhibition of photosynthesis in C3 plants: stomatal and non-stomatal limitations revisited.

            J Flexas (2002)
            There is a long-standing controversy as to whether drought limits photosynthetic CO2 assimilation through stomatal closure or by metabolic impairment in C3 plants. Comparing results from different studies is difficult due to interspecific differences in the response of photosynthesis to leaf water potential and/or relative water content (RWC), the most commonly used parameters to assess the severity of drought. Therefore, we have used stomatal conductance (g) as a basis for comparison of metabolic processes in different studies. The logic is that, as there is a strong link between g and photosynthesis (perhaps co-regulation between them), so different relationships between RWC or water potential and photosynthetic rate and changes in metabolism in different species and studies may be 'normalized' by relating them to g. Re-analysing data from the literature using light-saturated g as a parameter indicative of water deficits in plants shows that there is good correspondence between the onset of drought-induced inhibition of different photosynthetic sub-processes and g. Contents of ribulose bisphosphate (RuBP) and adenosine triphosphate (ATP) decrease early in drought development, at still relatively high g (higher than 150 mmol H20 m(-2) s(-1)). This suggests that RuBP regeneration and ATP synthesis are impaired. Decreased photochemistry and Rubisco activity typically occur at lower g (<100 mmol H20 m(-2) s(-1)), whereas permanent photoinhibition is only occasional, occurring at very low g (<50 mmol H20 m(-2) s(-1)). Sub-stomatal CO2 concentration decreases as g becomes smaller, but increases again at small g. The analysis suggests that stomatal closure is the earliest response to drought and the dominant limitation to photosynthesis at mild to moderate drought. However, in parallel, progressive down-regulation or inhibition of metabolic processes leads to decreased RuBP content, which becomes the dominant limitation at severe drought, and thereby inhibits photosynthetic CO2 assimilation.
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              Photooxidative stress in plants

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                Author and article information

                Contributors
                Journal
                Front Plant Sci
                Front Plant Sci
                Front. Plant Sci.
                Frontiers in Plant Science
                Frontiers Media S.A.
                1664-462X
                21 February 2020
                2019
                : 10
                : 1804
                Affiliations
                [1] 1 School of Environment, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Beijing Normal University , Beijing, China
                [2] 2 School of Life and Geographic Sciences, Qinghai Normal University , Xining, China
                [3] 3 Qinghai Academy of Animal Husbandry and Veterinary Science, Qinghai University , Xining, China
                [4] 4 Northwest Institute of Plateau Biology, Key Laboratory of Restoration Ecology of Cold Are in Qinghai Province, Chinese Academy of Science , Xining, China
                [5] 5 Research Department, Earth University , San José, Costa Rica
                Author notes

                Edited by: Boris Rewald, University of Natural Resources and Life Sciences Vienna, Austria

                Reviewed by: Minhui He, Northwest A&F University, China; Gang Fu, Chinese Academy of Sciences, China

                *Correspondence: Shikui Dong, dsk03037@ 123456bnu.edu.cn

                This article was submitted to Functional Plant Ecology, a section of the journal Frontiers in Plant Science

                Article
                10.3389/fpls.2019.01804
                7047333
                32153598
                50463738-9881-46fd-9949-cb497cb5ddd3
                Copyright © 2020 Shen, Dong, Li, Wang, Xiao, Yang, Zhang, Gao, Xu, Zhi, Liu, Dong, Zhou and Yeomans

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                History
                : 18 September 2019
                : 24 December 2019
                Page count
                Figures: 8, Tables: 1, Equations: 1, References: 74, Pages: 13, Words: 5397
                Funding
                Funded by: State Key Joint Laboratory of Environmental Simulation and Pollution Control 10.13039/501100011282
                Categories
                Plant Science
                Original Research

                Plant science & Botany
                qinghai-tibetan plateau,stomatal conductance,antioxidant enzymes,photosynthesis,leymus secalinus

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