Influence of elevated CO2 concentration on salt and drought resistance mechanisms of a C3 (Chenopodium quinoa) and a C4 (Atriplex nummularia) xero-halophyte

以藜（Chenopodium quinoa，C3植物）和滨藜（Atriplex nummularia，C4植物）为例，研究了大气CO2浓度升高对C3和C4旱盐植物耐盐性和抗旱性的影响。CO2浓度升高显著增强了苦草的抗盐性和抗旱性。藜麦（C3），而对A. nummularia（C4）。这一假设将通过比较和相互关联的转录组和相应的生态生理参数的上述物种在不同水平的NaCl，盐度和干旱胁迫下的环境和CO2浓度升高进行测试。所讨论的主题是在全球气候变化的过程中，这是由大气中的微量气体，如二氧化碳浓度上升，并对农业具有破坏性的影响，因为它加剧了土壤盐碱化和干旱的过程中具有重大意义。该项目的结果将为今后在干旱和/或盐碱土壤上可持续利用C3和C4旱盐植物提供基础，这可以减轻气候变化的原因和后果。此外，转录组分析被认为是C. quinoa和A. nummularia作为第一个旱盐生C3模式植物的盐/干旱和CO2浓度升高的相互作用，这可能是非常重要的评估C3和C4作物植物在世界气候变化的表现，并提高其耐盐性和/或抗旱性。

Taking Chenopodium quinoa (C3 plant) and Atriplex nummularia (C4 plant) as an example, the planned study intends to answer the question if elevated atmospheric CO2 concentration has a different effect on the salt and drought resistance of C3 and C4 xero-halophytes. It is hypothesized that elevated CO2 concentration significantly enhances the salt and drought resistance of C. quinoa (C3), while it has only a slightly positive effect on the resistance of A. nummularia (C4). This hypothesis will be tested by comparing and interrelating the transcriptome and corresponding eco-physiological parameters of the mentioned species at different levels of NaCl salinity and drought stress under ambient and elevated CO2 concentration. The addressed topic is of major importance in the course of global climate change which is caused by rising atmospheric concentration of trace gases such as CO2 and has devastating effects on agriculture because it exacerbates soil salinisation and drought. The results of the project will provide a basis for the future sustainable use of C3 and C4 xero-halophytes on dry and/or saline soils, which can mitigate the cause and the consequences of climate change. Furthermore, transcriptome profiling is thought to lay a foundation stone for the development of C. quinoa and A. nummularia as the first xero-halophytic C3 model plants regarding the interaction of salinity/drought and elevated CO2, which can be of major importance for assessing the performance of C3 and C4 crop plants in a world of climate change and for increasing their salt and/or drought resistance.