Guo Jun-Mei, Yang Jun-Xing, Yang Jun, Wan Xiao-Ming, Meng Xiao-Fei, Chen Tong-Bin, He Meng-Ke, Zhou Xiao-Yong, Xu Tie-Bing
Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2021 Mar 8;42(3):1177-1184. doi: 10.13227/j.hjkx.202010128.
A pot experiment was conducted to investigate the growth response and Cd accumulation characteristics among different populations of in Cd-contaminated cinnamon soil (2.22 mg·kg) with the addition of different concentrations of NaCl. Results showed that the biomasses and Cd concentrations of showed significant differences among different populations under Cd alone or Cd-salt combined stress. Moreover, salt stress aggravated the growth inhibition of and the Cd concentrations in different populations showed a declining trend, which may be related to the salt-derived pH increase leading to a decrease in Cd bioavailability. In addition, the growth and Cd absorption responses of under salt stress were significantly different in the different populations. The shoot biomasses of the LN population were significantly higher than in other populations under different treatment, and showed no significant decrease with the addition of 1% NaCl when compared with the control treatment and the tolerance index remained 0.91. At the same time, the shoot Cd concentration of the LN population was significantly higher than in other populations under different treatments. The result may be attributed to the Cd accumulation and detoxification mechanisms in LN are prior than other populations that may also have important physiological mechanisms for tolerance of salt stress. In summary, although Cd uptake in decreased with salt stress, there were significant differences among different populations. LN populations accumulated 84.4 μg·plant Cd in shoots with 2% NaCl addition, which was 48.4%-89.3% higher than in other populations. Therefore, especially LN populations, is a good candidate for phytoremediation of Cd-contaminated saline soil.
进行了一项盆栽试验，以研究在添加不同浓度氯化钠的镉污染肉桂土（2.22毫克·千克）中，不同种群的[植物名称未给出]的生长响应和镉积累特征。结果表明，在单独镉胁迫或镉 - 盐复合胁迫下，不同种群的[植物名称未给出]的生物量和镉浓度存在显著差异。此外，盐胁迫加剧了[植物名称未给出]的生长抑制，不同种群中的镉浓度呈下降趋势，这可能与盐导致的pH值升高导致镉生物有效性降低有关。此外，盐胁迫下不同种群的[植物名称未给出]的生长和镉吸收响应存在显著差异。LN种群的地上部生物量在不同处理下显著高于其他种群，与对照处理相比，添加1%氯化钠时地上部生物量无显著下降，耐受指数保持在0.91。同时，LN种群地上部镉浓度在不同处理下也显著高于其他种群。结果可能归因于LN种群中镉的积累和解毒机制比其他种群更优先，其可能还具有耐受盐胁迫的重要生理机制。总之，虽然盐胁迫下[植物名称未给出]对镉的吸收减少，但不同种群之间存在显著差异。添加2%氯化钠时，LN种群地上部积累84.4微克·株镉，比其他种群高48.4% - 89.3%。因此，[植物名称未给出]尤其是LN种群，是镉污染盐碱土植物修复的良好候选植物。
