Carreiras João, Pérez-Romero Jesús Alberto, Mateos-Naranjo Enrique, Redondo-Gómez Susana, Matos Ana Rita, Caçador Isabel, Duarte Bernardo
MARE-Marine and Environmental Sciences Centre, Faculty of Sciences of the University of Lisbon, Campo Grande, 1749-016 Lisbon, Portugal.
Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Av. Reina Mercedes s/n, 41012 Sevilla, Spain.
Plants (Basel). 2021 Sep 30;10(10):2072. doi: 10.3390/plants10102072.
Land salinization, resulting from the ongoing climate change phenomena, is having an increasing impact on coastal ecosystems like salt marshes. Although halophyte species can live and thrive in high salinities, they experience differences in their salt tolerance range, being this a determining factor in the plant distribution and frequency throughout marshes. Furthermore, intraspecific variation to NaCl response is observed in high-ranging halophyte species at a population level. The present study aims to determine if the environmental history, namely heavy metal pre-conditioning, can have a meaningful influence on salinity tolerance mechanisms of , a highly disperse grass invader in the Mediterranean marshes. For this purpose, individuals from pristine and heavy metal contaminated marsh populations were exposed to a high-ranging salinity gradient, and their intraspecific biophysical and biochemical feedbacks were analyzed. When comparing the tolerance mechanisms of both populations, from the contaminated marsh appeared to be more resilient and tolerant to salt stress, this was particularly present at the high salinities. Consequently, as the salinity increases in the environment, the heavy metal contaminated marsh may experience a more resilient and better adapted community. Therefore, the heavy metal pre-conditioning of salt mash populations appears to be able to create intraspecific physiological variations at the population level that can have a great influence on marsh plant distribution outcome.
由于当前气候变化现象导致的土地盐碱化，正日益影响着盐沼等沿海生态系统。尽管盐生植物物种能够在高盐度环境中生存和繁衍，但它们在耐盐范围上存在差异，这是决定植物在整个沼泽地分布和频率的一个因素。此外，在高耐盐性盐生植物物种的种群水平上，观察到了对氯化钠反应的种内变异。本研究旨在确定环境历史，即重金属预处理，是否会对一种在地中海沼泽中高度分散的入侵草本植物的耐盐机制产生显著影响。为此，将来自原始沼泽种群和受重金属污染沼泽种群的个体暴露于高盐度梯度下，并分析它们的种内生物物理和生化反馈。在比较两个种群的耐受机制时，受污染沼泽中的该植物似乎对盐胁迫更具弹性和耐受性，这在高盐度条件下尤为明显。因此，随着环境中盐度的增加，受重金属污染的沼泽可能会出现更具弹性且适应性更强的该植物群落。所以，盐沼种群的重金属预处理似乎能够在种群水平上产生种内生理变异，这可能对沼泽植物的分布结果产生重大影响。
