Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau
| Autor: | Shiliang Liu, Yangliu Zhi, Xiaoxia Gao, Shuai Li, Yudan Xu, Jing Zhang, Hao Shen, Huakun Zhou, Mingyue Yang, Quanming Dong, Shikui Dong, Jiannan Xiao, Jane C. Yeomans, Wenying Wang |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Stomatal conductance Leymus secalinus chemistry.chemical_element Plant Science lcsh:Plant culture Photosynthesis 01 natural sciences Qinghai tibetan plateau Animal science antioxidant enzymes lcsh:SB1-1110 Original Research Transpiration photosynthesis Qinghai-Tibetan plateau Chemistry 04 agricultural and veterinary sciences Nitrogen Point of delivery stomatal conductance 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Deposition (chemistry) 010606 plant biology & botany |
| Zdroj: | Frontiers in Plant Science, Vol 10 (2020) Frontiers in Plant Science |
| ISSN: | 1664-462X |
| DOI: | 10.3389/fpls.2019.01804 |
| Popis: | 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 (Anet ), stomatal conductance (gs ), intercellular CO2 concentration (Ci ), and transpiration rate (Tr ), while N deposition and warming plus N deposition significantly increased those parameters of L. secalinus. Warming significantly increased the VPD and Ls , 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 gs , Chl, Chla, Chlb, Rubisco activity, and Anet . Under warming, only gs showed a significantly positive relation with Anet . 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. |
| Databáze: | OpenAIRE |
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