在镉污染的弱碱性土壤中用阳离子给种子打底对小麦种子镉积累的影响

IF 2.3 Q1 AGRICULTURE, MULTIDISCIPLINARY ACS agricultural science & technology Pub Date : 2024-03-14 DOI:10.1021/acsagscitech.4c00006
Chenghao Ge, Yixuan Wang, Wenyan Ma, Hafiz Adeel Ahmad, Lijuan Zhao, Cheng Cheng, Hong-Bo Li and Dongmei Zhou*, 
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摘要

鉴于小麦镉(Cd)的经济控制方法有限,浸种是降低小麦镉(Cd)含量的可行解决方案。本研究旨在通过植物离子组学、转录组学和高通量测序技术,探索浸种降低小麦幼苗镉含量背后的精确机制。结果表明,用 Mn2+(100 μM)浸种能显著改善小麦幼苗的生长参数。与对照组相比,用 Ag+(1、2 μM)浸种能明显降低根部(分别为 32.9% 和 40.6%)和茎部(分别为 19.4% 和 20.3%)的镉含量,而用 Zn2+(10 mM)和 Mn2+(20、100 μM)浸种能明显降低叶片(分别为 29.4%、15.6% 和 33.5%)的镉含量。浸种诱导的小麦幼苗中镉含量的不同程度降低归因于参与镉吸收的基因转录重组和根圈土壤中根瘤菌属(耐镉的植物有益真菌)的招募。这表明浸种能有效控制弱碱性土壤中小麦对镉的吸收。
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Effect of Seed Priming with Cations on Cadmium Accumulation in Wheat Seedings under Cadmium-Contaminated Weakly Alkaline Soil

Seed soaking is a viable solution for reducing cadmium (Cd) levels in wheat, given the limited options for economically controlling it. This study aimed to explore the precise mechanisms behind seed priming to reduce Cd levels in wheat seedlings via plant ionomics, transcriptomics, and high-throughput sequencing technologies. The results showed that seed soaking with Mn2+ (100 μM) significantly improved the growth parameters of wheat seedlings. Seed priming with Ag+ (1, 2 μM) significantly decreased Cd levels in the roots (32.9 and 40.6%, respectively) and stems (19.4 and 20.3%, respectively), whereas seed priming with Zn2+ (10 mM) and Mn2+ (20, 100 μM) significantly decreased Cd levels in the leaves (29.4, 15.6, and 33.5%, respectively) compared to that in the control group. These varied reductions of Cd in wheat seedlings induced by seed soaking were attributed to the restructuring of gene transcription involved in Cd absorption and the recruitment of the genus Rhizopus (plant-beneficial fungi tolerant to Cd) in the rhizosphere soil. It shows that seed soaking could effectively control Cd absorption by wheat in a weakly alkaline soil.

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