Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun 130102, China.
Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun 130102, China; College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
J Hazard Mater. 2022 May 15;430:128489. doi: 10.1016/j.jhazmat.2022.128489. Epub 2022 Feb 15.
The accumulation of heavy metals in soil, especially cadmium (Cd), may influence the tolerance of crops to other abiotic stress, such as low temperature. In this study, the low temperature tolerance of abscisic acid (ABA)-deficient mutant (Az34) barley and its wild-type (WT) irrigated with Cd solution (1 g L) was tested. It was found that Cd aggravated the destruction of chloroplast ultrastructure and disturbed the ion homeostasis under low temperature. The presence of Cd increased the reactive oxygen species (ROS) accumulation, along with the depressed antioxidant enzyme activities, and limited the plant growth. Compared with WT, Az34 plants had lower ROS scavenging ability and decreased maximum quantum efficiency of PS II (Fv/Fm) under Cd and low temperature. In addition, the C-repeat binding factor and cold response (CBF-COR) signaling pathway was negatively affected by Cd treatment under low temperature, which also reduced the low temperature tolerance in barley. Therefore, it was indicated that the Cd reduced the low temperature tolerance in barley, that highlighted the potential risks of depressed low temperature tolerance caused by Cd pollution in barley.
土壤中重金属的积累，特别是镉（Cd），可能会影响作物对其他非生物胁迫（如低温）的耐受能力。在这项研究中，用 Cd 溶液（1 g L）灌溉的脱落酸（ABA）缺陷突变体（Az34）大麦及其野生型（WT）的低温耐受性进行了测试。结果发现，Cd 加剧了叶绿体超微结构的破坏，并在低温下扰乱了离子平衡。Cd 的存在增加了活性氧（ROS）的积累，同时抑制了抗氧化酶的活性，限制了植物的生长。与 WT 相比，在 Cd 和低温下，Az34 植物的 ROS 清除能力较低，最大光化学量子效率（Fv/Fm）降低。此外，低温下 Cd 处理还会对 C 重复结合因子和冷响应（CBF-COR）信号通路产生负面影响，从而降低大麦的低温耐受性。因此，研究表明 Cd 降低了大麦的低温耐受性，这突出了 Cd 污染可能降低大麦低温耐受性的潜在风险。
