Details

Autor(en) / Beteiligte

• Wang, Liang
• Zhang, Qingying
• Liao, Xiaoyong
• Li, Xiaohua
• Zheng, Shunan
• Zhao, Fenghua

Titel

Phytoexclusion of heavy metals using low heavy metal accumulating cultivars: A green technology

Ist Teil von

• Journal of hazardous materials, 2021-07, Vol.413, p.125427, Article 125427

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Heavy metal (HM) pollution of farmland is a serious problem worldwide and consumption of HM-contaminated food products poses significant public health risks. Phytoexclusion using low HM accumulating cultivars (LACs) is a promising and practical technology to mitigate the risk of HM contamination of agricultural products grown in polluted soils, and does not alter cultivation practices, is easy to apply, and is economical. This review provides an overview of the major scientific advances accomplished in the field of LACs worldwide. The LACs concept and identification criteria are presented, and the known LACs among currently cultivated grain crops and vegetables are re-evaluated. The low HM accumulation by LACs is affected by crop ecophysiological features and soil physicochemical characteristics. Taking low Cd accumulating cultivars as an example, it is known that they can efficiently exclude Cd from entering their edible parts in three ways: 1) decrease in root Cd uptake by reducing organic acids secretion in the rhizosphere and transport protein production; 2) restriction of Cd translocation from roots to shoots via enhanced Cd retention in the cell wall and Cd sequestration in vacuoles; and 3) reduction in Cd translocation from shoots to grains by limiting Cd redirection and remobilization mediated through nodes. We propose an LAC application strategy focused on LACs and optimized to work with other agronomic measures according to the classification of HM risk level for LACs, providing a cost-effective and practical solution for safe utilization of large areas of farmland polluted with low to moderate levels of HMs. [Display omitted] •LACs are a promising approach for safe utilization of farmland.•A clear consensus on the concept and identification of LACs has not yet been reached.•Marker-assisted selection can facilitate LACs screening and breeding.•Multiple mechanisms of low Cd accumulation in LACs are systematically proposed.•A practical framework should be based on LACs along with other measures.