Physiological response of Miscanthus genotypes to salinity stress under elevated CO2
Abstract Miscanthus is a class of C4 perennial grasses, which can be cultivated on marginal land even with high salinity. However, the future environment may be altered by elevated atmospheric CO2 concentration ([CO2]) and knowledge is limited about the interactive impacts of CO2 enrichment and sali...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2022-07-01
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| Series: | GCB Bioenergy |
| Subjects: | |
| Online Access: | https://doi.org/10.1111/gcbb.12948 |
| _version_ | 1828335535858384896 |
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| author | Kehao Liang Xiaoying Peng Fulai Liu |
| author_facet | Kehao Liang Xiaoying Peng Fulai Liu |
| author_sort | Kehao Liang |
| collection | DOAJ |
| description | Abstract Miscanthus is a class of C4 perennial grasses, which can be cultivated on marginal land even with high salinity. However, the future environment may be altered by elevated atmospheric CO2 concentration ([CO2]) and knowledge is limited about the interactive impacts of CO2 enrichment and salinity on this C4 bioenergy crop. In this study, three Miscanthus genotypes (M. sacchariflorus, M. × giganteus, and M. lutarioriparius) were grown under either ambient (400 ppm) [CO2] (a[CO2]) or elevated (800 ppm) [CO2] (e[CO2]) at five salinity levels (0, 50, 100, 150, and 200 mm NaCl denoted as S0, S1, S2, S3, and S4, respectively), and the impacts of e[CO2] on plant physiological responses to salt stress were investigated. Our results suggested that e[CO2] had no obvious effect on net photosynthetic rate (An), but significantly reduced the stomatal conductance (gs), thus improving water use efficiency regardless of salinity levels. In addition, e[CO2] could improve water potential of plants under both control and saline conditions, but the magnitude of increase was highly genotypic dependent. The maximum quantum yield of photosystem II (Fv/Fm) was not altered by e[CO2], which, however, could alleviate the negative effect of salt on Fv/Fm. Furthermore, salt stress increased the concentration of abscisic acid (ABA) in xylem sap and leaves, while the effect of e[CO2] on ABA level was closely associated with genotypes. e[CO2] reduced Na+ concentration and had positive influences on maintaining Na+/K+ ratio, thus favoring ionic homeostasis, although such effect was genotype dependent. Collectively, our data suggested that e[CO2] could partially mitigate the detrimental effects of salinity, conferring higher salt tolerance of Miscanthus. |
| first_indexed | 2024-04-13T21:48:34Z |
| format | Article |
| id | doaj.art-f1339dea7708409ba9fbe57885b877a0 |
| institution | Directory Open Access Journal |
| issn | 1757-1693 1757-1707 |
| language | English |
| last_indexed | 2024-04-13T21:48:34Z |
| publishDate | 2022-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | GCB Bioenergy |
| spelling | doaj.art-f1339dea7708409ba9fbe57885b877a02022-12-22T02:28:29ZengWileyGCB Bioenergy1757-16931757-17072022-07-0114785887410.1111/gcbb.12948Physiological response of Miscanthus genotypes to salinity stress under elevated CO2Kehao Liang0Xiaoying Peng1Fulai Liu2Department of Plant and Environmental Science, Faculty of Science University of Copenhagen Taastrup DenmarkCollege of Bioscience and Biotechnology Hunan Agricultural University Changsha Hunan ChinaDepartment of Plant and Environmental Science, Faculty of Science University of Copenhagen Taastrup DenmarkAbstract Miscanthus is a class of C4 perennial grasses, which can be cultivated on marginal land even with high salinity. However, the future environment may be altered by elevated atmospheric CO2 concentration ([CO2]) and knowledge is limited about the interactive impacts of CO2 enrichment and salinity on this C4 bioenergy crop. In this study, three Miscanthus genotypes (M. sacchariflorus, M. × giganteus, and M. lutarioriparius) were grown under either ambient (400 ppm) [CO2] (a[CO2]) or elevated (800 ppm) [CO2] (e[CO2]) at five salinity levels (0, 50, 100, 150, and 200 mm NaCl denoted as S0, S1, S2, S3, and S4, respectively), and the impacts of e[CO2] on plant physiological responses to salt stress were investigated. Our results suggested that e[CO2] had no obvious effect on net photosynthetic rate (An), but significantly reduced the stomatal conductance (gs), thus improving water use efficiency regardless of salinity levels. In addition, e[CO2] could improve water potential of plants under both control and saline conditions, but the magnitude of increase was highly genotypic dependent. The maximum quantum yield of photosystem II (Fv/Fm) was not altered by e[CO2], which, however, could alleviate the negative effect of salt on Fv/Fm. Furthermore, salt stress increased the concentration of abscisic acid (ABA) in xylem sap and leaves, while the effect of e[CO2] on ABA level was closely associated with genotypes. e[CO2] reduced Na+ concentration and had positive influences on maintaining Na+/K+ ratio, thus favoring ionic homeostasis, although such effect was genotype dependent. Collectively, our data suggested that e[CO2] could partially mitigate the detrimental effects of salinity, conferring higher salt tolerance of Miscanthus.https://doi.org/10.1111/gcbb.12948element accumulationelevated CO2gas exchangeMiscanthussalinity stresswater relation |
| spellingShingle | Kehao Liang Xiaoying Peng Fulai Liu Physiological response of Miscanthus genotypes to salinity stress under elevated CO2 GCB Bioenergy element accumulation elevated CO2 gas exchange Miscanthus salinity stress water relation |
| title | Physiological response of Miscanthus genotypes to salinity stress under elevated CO2 |
| title_full | Physiological response of Miscanthus genotypes to salinity stress under elevated CO2 |
| title_fullStr | Physiological response of Miscanthus genotypes to salinity stress under elevated CO2 |
| title_full_unstemmed | Physiological response of Miscanthus genotypes to salinity stress under elevated CO2 |
| title_short | Physiological response of Miscanthus genotypes to salinity stress under elevated CO2 |
| title_sort | physiological response of miscanthus genotypes to salinity stress under elevated co2 |
| topic | element accumulation elevated CO2 gas exchange Miscanthus salinity stress water relation |
| url | https://doi.org/10.1111/gcbb.12948 |
| work_keys_str_mv | AT kehaoliang physiologicalresponseofmiscanthusgenotypestosalinitystressunderelevatedco2 AT xiaoyingpeng physiologicalresponseofmiscanthusgenotypestosalinitystressunderelevatedco2 AT fulailiu physiologicalresponseofmiscanthusgenotypestosalinitystressunderelevatedco2 |