Fan Xinyu, Bao Guozhang, Xie Yunchao, Jiang Yunqi, Fan Cunxin, Li Guomei
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.
School of Geographical and Earth Sciences, University of Glasgow, Scotland, UK.
Funct Plant Biol. 2025 Apr;52. doi: 10.1071/FP24229.
The grassland in north-east China has an important ecological service function. However, freeze-thaw, alkaline salt, and Solanum rostratum Dunal often have adverse effects on the stability of grassland ecosystem in this region. In this study, the effects of combined stress of freeze-thaw, alkaline salt, and S. rostratum extract on rye (Secale cereale ) were discussed. It was found that the combined stress of alkaline salt and S. rostratum extract (AR) inhibited the seed germination and seedling growth of rye. Compared with AR in the non-freeze-thaw group, the contents of soluble protein (SP), malondialdehyde (MDA) and hydrogen peroxide (H2 O2 ) of rye seedlings were significantly increased under the combined stress of freeze-thaw, alkaline salt, and S. rostratum extract (FAR), and the activities of superoxide dismutase (SOD) and peroxidase (POD) were significantly increased. Photosynthetic indices (Tr, Pn, gs , Ci) were significantly decreased. The results indicated that freeze-thaw could aggravate the adverse effects of AR treatment on rye seedlings. Therefore, in the period of frequent freeze-thaw, it is important to carry out timely targeted control measures for S. rostratum to reduce the adverse effects of combined stress on grassland ecosystem, which is conducive to the ecological security and stability maintenance of grassland ecosystem in north-east China.
中国东北地区的草原具有重要的生态服务功能。然而，冻融、盐碱以及刺萼龙葵常常对该地区草原生态系统的稳定性产生不利影响。本研究探讨了冻融、盐碱和刺萼龙葵提取物复合胁迫对黑麦（Secale cereale）的影响。结果发现，盐碱与刺萼龙葵提取物复合胁迫（AR）抑制了黑麦种子萌发和幼苗生长。与非冻融组的AR相比，在冻融、盐碱和刺萼龙葵提取物复合胁迫（FAR）下，黑麦幼苗的可溶性蛋白（SP）、丙二醛（MDA）和过氧化氢（H2O2）含量显著增加，超氧化物歧化酶（SOD）和过氧化物酶（POD）活性显著提高，光合指标（Tr、Pn、gs、Ci）显著降低。结果表明，冻融可加剧AR处理对黑麦幼苗的不利影响。因此，在冻融频繁时期，及时对刺萼龙葵采取针对性防控措施，以减轻复合胁迫对草原生态系统的不利影响，有利于维护中国东北地区草原生态系统的生态安全与稳定至关重要。
