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Screening for Cd-Safe Cultivars of Chinese Cabbage and a Preliminary Study on the Mechanisms of Cd Accumulation

机译:大白菜中镉安全栽培品种的筛选及镉积累机理的初步研究

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摘要

With the rapid progress of industrialization, the effects of environmental contamination on plant toxicity, and subsequently on human health, is a growing concern. For example, the heavy metal pollution of soil such as that caused by cadmium (Cd) is a serious threat. Therefore, screening for pollution-safe edible plants is an essential approach for growing plants under heavy metal-contaminated soils. In the current study, 35 Chinese cabbage (Brassica pekinensis L.) cultivars were selected with the aim of screening for Cd-safe cultivars (CSCs), analyzing their safety, and exploring the mechanism of Cd accumulation. Our field-culture experiments revealed that the Cd content in the edible parts of the cultivars were varied and were determined to possibly be CSCs. Hydroponics experiments were used to simulate six different degrees of soil contamination (high and low Cd concentrations) on possible CSCs. The results indicated a significant difference (p < 0.05) in Cd concentration in the cultivars, and verified the safety of these possible CSCs. The analyses of the transport coefficient and expression levels showed that the differences in Cd accumulation among the Chinese cabbage cultivars were related to the expression of genes involved in absorption and transport rather than a root-to-shoot translocation limitation.
机译:随着工业化的快速发展,环境污染对植物毒性以及随后对人体健康的影响日益受到关注。例如,土壤的重金属污染(例如镉(Cd)造成的污染)是一个严重的威胁。因此,筛选对污染安全的食用植物是在重金属污染土壤下生长植物的重要方法。在本研究中,选择了35个大白菜(Brassica pekinensis L.)品种,目的是筛选Cd安全品种(CSC),分析其安全性并探索Cd积累的机理。我们的田间培养实验表明,该品种可食部分中的镉含量各不相同,并确定可能是CSC。水培实验用于模拟可能的CSC上六种不同程度的土壤污染(高和低Cd浓度)。结果表明品种中Cd浓度存在显着差异(p <0.05),并验证了这些可能的CSC的安全性。对转运系数和表达水平的分析表明,大白菜品种中Cd积累的差异与吸收和转运相关基因的表达有关,而不是从根到茎易位限制。

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