Key Laboratory of Groundwater Resources and Environment of the Ministry of Education (Jilin University), Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130012, China.
College of Plant Science, Jilin University, Changchun, 130062, China.
Environ Sci Pollut Res Int. 2022 Oct;29(46):70552-70563. doi: 10.1007/s11356-022-20800-2. Epub 2022 May 19.
In the Qinghai-Tibet Plateau, both the large daily temperature difference and soil salinization make plants susceptible to abiotic stresses such as freeze-thaw and salinity. Meanwhile, crops in this area can be affected by artemisinin, an antimalarial secondary metabolite produced in Artemisia. Under freeze-thaw and salinity stresses, artemisinin was induced as an allelopathy stress factor to explore the physiological response of highland barley, including the relative electrical conductivity (RC), soluble protein (SP) content, malondialdehyde (MDA) content, antioxidant enzyme activity, and water use efficiency (WUE). Compared with the control group, the contents of RC and MDA in seedling leaves under stress were significantly increased by 24.74-402.37% and 20.18-77.95%, indicating that cell membrane permeability was greatly damaged, and WUE was significantly decreased by 15.77-238.59%. The activity of enzymes increased under single stress and decreased under combined stress. Salinity, artemisinin, and freeze-thaw stress show a synergistic relationship; that is, compound stresses were more serious than single stress. In summary, the results of this study revealed the physiological and ecological responses of barley seedlings under different habitat stresses and the interactions among different stress factors.
在青藏高原，较大的日温差和土壤盐碱化使植物容易受到非生物胁迫，如冻融和盐度。同时，该地区的作物可能会受到青蒿素的影响，青蒿素是青蒿中产生的一种抗疟次生代谢物。在冻融和盐胁迫下，青蒿素被诱导为化感胁迫因子，以探讨包括相对电导率（RC）、可溶性蛋白（SP）含量、丙二醛（MDA）含量、抗氧化酶活性和水分利用效率（WUE）在内的青稞的生理响应。与对照组相比，胁迫下幼苗叶片的 RC 和 MDA 含量分别显著增加了 24.74-402.37%和 20.18-77.95%，表明细胞膜通透性受到严重破坏，WUE 显著降低了 15.77-238.59%。在单一胁迫下，酶的活性增加，在复合胁迫下则减少。盐度、青蒿素和冻融胁迫呈协同关系，即复合胁迫比单一胁迫更为严重。综上所述，本研究结果揭示了青稞幼苗在不同生境胁迫下的生理和生态响应以及不同胁迫因子之间的相互作用。
