Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, PR China.
College of Resources and Environment, Yangtze University, Wuhan, China.
Chemosphere. 2021 Aug;276:130137. doi: 10.1016/j.chemosphere.2021.130137. Epub 2021 Mar 10.
Intercropping with Cicer arietinum L has been suggested to improve the Cd decontamination capacity of Festuca arundinacea. However, the mechanisms stimulating this effect have not been revealed. The current study was designed to evaluate the changes in the subcellular distribution and chemical forms of Cd in different leaf types of F. arundinacea intercropped with C. arietinum L under different schemes. The results indicated that more than half of the Cd was bound in the cell wall in plant organs under all planting schemes, showing that cell wall deposition is an important detoxication pathway for the metal. Relative to the monoculture scheme, coordinate and malposed intercropping schemes increased the Cd concentration deposited in the cytoplasm of below-ground tissues from 37.6% to 45.2% and 45.1%, respectively. Additionally, the proportion of inorganic and water-soluble Cd in the below-ground parts of F. arundinacea increased from 73.6% in the monoculture scheme to 80.6% and 84.7%, in the coordinate and malposed intercropping schemes, respectively. The results exhibited that intercropping schemes can activate the metal in below-ground tissues and move it to aerial parts. The present study revealed the promoting mechanism of intercropping schemes on the phytoremediation efficiency of F. arundinacea for Cd at a subcellular level.
间作对提高节节麦 Cd 污染修复能力的影响已有报道，但刺激这种效应的机制尚未揭示。本研究旨在评估不同间作方案下，与鹰嘴紫云英间作后不同叶型节节麦中 Cd 的亚细胞分布和化学形态的变化。结果表明，在所有种植方案中，超过一半的 Cd 结合在植物器官的细胞壁中，表明细胞壁沉积是金属的重要解毒途径。与单作方案相比，协调间作和错位间作方案分别将地下组织细胞质中 Cd 的沉积浓度从 37.6%增加到 45.2%和 45.1%。此外，节节麦地下部分的无机 Cd 和水溶性 Cd 的比例从单作方案的 73.6%增加到协调间作和错位间作方案的 80.6%和 84.7%。结果表明，间作方案可以激活地下组织中的金属，并将其转移到地上部分。本研究从亚细胞水平揭示了间作方案对节节麦 Cd 植物修复效率的促进机制。
