这项研究通过盆栽实验评估了甘薯对镉(Cd)胁迫的响应,从理论上证实了它们在Cd污染的农田中的综合应用。实验包括CK处理和三个Cd胁迫处理,浓度分别为3、30和150mg/kg。分别。我们分析了甘薯在不同生长期的特定指标,例如单个植物的生长,光合作用,抗氧化能力,和碳水化合物Cd积累分布。在此基础上,研究了植物在整个生长周期中响应Cd胁迫的碳代谢特征。结果表明,T2和T3处理抑制了葡萄藤的生长,叶面积扩大,茎直径伸长率,和甘薯的块根生长;特别是,T3处理显著增加了甘薯分枝的数量。在Cd胁迫下,甘薯中叶绿素的合成受到显著抑制,Rubisco活性显著下降。随着Cd浓度的增加,PSⅡ的功能也受到影响。在低Cd浓度处理中,可溶性糖含量没有显着变化。相比之下,在高Cd浓度下显著降低。此外,块根淀粉含量随Cd浓度的增加而显著降低。在整个植物生长过程中,过氧化氢酶的活性水平,过氧化物酶,超氧化物歧化酶在T2和T3处理中显著增加。相比之下,T1处理的超氧化物歧化酶活性明显低于CK。随着Cd应用的不断增加,其在各种甘薯器官中的积累相应增加。在吸收根中检测到最高的生物富集因子,块根具有较低的生物富集因子和Cd积累。此外,从茎到叶柄的转移因子是马铃薯器官中最高的。这些结果表明,甘薯具有较高的Cd耐受性和对Cd污染农田的恢复潜力。
This study evaluated the responses of sweet potatoes to Cadmium (Cd) stress through pot experiments to theoretically substantiate their comprehensive applications in Cd-polluted agricultural land. The experiments included a CK treatment and three Cd stress treatments with 3, 30, and 150 mg/kg concentrations, respectively. We analyzed specified indicators of sweet potato at different growth periods, such as the individual plant growth, photosynthesis, antioxidant capacity, and carbohydrate Cd accumulation distribution. On this basis, the characteristics of the plant carbon metabolism in response to Cd stress throughout the growth cycle were explored. The results showed that T2 and T3 treatments inhibited the vine growth, leaf area expansion, stem diameter elongation, and tuberous root growth of sweet potato; notably, T3 treatment significantly increased the number of sweet potato branches. Under Cd stress, the synthesis of chlorophyll in sweet potato was significantly suppressed, and the Rubisco activity experienced significant reductions. With the increasing Cd concentration, the function of PS II was also affected. The soluble sugar content underwent no significant change in low Cd concentration treatments. In contrast, it decreased significantly under high Cd concentrations. Additionally, the tuberous root starch content decreased significantly with the increase in Cd concentration. Throughout the plant growth, the activity levels of catalase, peroxidase, and superoxide dismutase increased significantly in T2 and T3 treatments. By comparison, the superoxide dismutase activity in T1 treatment was significantly lower than that of CK. With the increasing application of Cd, its accumulation accordingly increased in various sweet potato organs. The the highest bioconcentration factor was detected in absorbing roots, while the tuberous roots had a lower bioconcentration factor and Cd accumulation. Moreover, the transfer factor from stem to petiole was the highest of the potato organs. These results demonstrated that sweet potatoes had a high Cd tolerance and a restoration potential for Cd-contaminated farmland.