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首页> 外文期刊>Environmental Science and Pollution Research >Cadmium re-distribution from pod and root zones and accumulation by peanut (Arachis hypogaea L.)
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Cadmium re-distribution from pod and root zones and accumulation by peanut (Arachis hypogaea L.)

机译：镉从豆荚和根部区域的再分布以及花生的积累（花生（Arachis hypogaea L.）

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摘要

Peanut (Arachis hypogaea L.) genotypes may differ greatly with regard to cadmium (Cd) accumulation, but the underlying mechanisms remain unclear. To determine the key factors that may contribute to Cd re-distribution and accumulation in peanut genotypes with different Cd accumulating patterns, a split-pot soil experiment was conducted with three common Chinese peanut cultivars (Fenghua-6, Huayu-20, and Huayu-23). The growth medium was separated into pod and root zones with varied Cd concentrations in each zone to determine the re-distribution of Cd after it is taken up via different routes. The peanut cultivars were divided into two groups based on Cd translocation efficiency as follows: (1) high internal Cd translocation efficiency cultivar (Fenghua-6) and (2) low internal Cd translocation efficiency cultivars (Huayu-20 and Huayu-23). Compared with Fenghua-6, low Cd translocation cultivars Huayu-20 and Huayu-23 showed higher biomass production, especially in stems and leaves, leading to dilution of metal concentrations. Results also showed that Cd concentration in roots increased significantly with increasing Cd concentrations in soils when Cd was applied in the root zone. However, there were no significant differences in the root Cd concentrations between different pod zone Cd treatments and the control, suggesting that root uptake, rather than pod uptake, is responsible for Cd accumulation in the roots of peanuts. Significant differences of Cd distribution were observed between pod and root zone Cd exposure treatments. The three peanut cultivars revealed higher kernel over total Cd fractions for pod than for root zone Cd exposure if only extra applied Cd was considered. This suggests that uptake through peg and pod shell might, at least partially, be responsible for the variation in Cd re-distribution and accumulation among peanut cultivars. Cd uptake by plants via two routes (i.e., via roots and via pegs and pods, respectively) and internal Cd translocation appear to be important mechanisms in determining Cd accumulation in the kernels of peanuts.
机译：花生（Arachis hypogaea L.）基因型在镉（Cd）积累方面可能有很大差异，但其潜在机制仍不清楚。为了确定可能导致Cd积累方式不同的花生基因型中Cd重新分布和积累的关键因素，我们对三种常见的中国花生品种（奉化6号，华玉20和华玉- 23）。将生长培养基分为豆荚和根部区域，每个区域中的Cd浓度不同，以确定通过不同途径吸收Cd后Cd的重新分布。根据Cd转运效率将花生品种分为两组：（1）内部Cd转运效率高的品种（Fenghua-6）和（2）内部Cd转运效率低的品种（Huayu-20和Huayu-23）。与风华6相比，低镉易位品种华玉20和华玉23表现出较高的生物量产量，尤其是茎和叶中的生物量更高，导致金属浓度降低。结果还表明，当在根区施用Cd时，土壤中Cd的浓度会随着根中Cd浓度的增加而显着增加。但是，不同荚果区镉处理与对照之间的根部镉浓度无显着差异，表明根吸收而不是荚果吸收是花生根中镉积累的原因。荚果和根区镉暴露处理之间的镉分布存在显着差异。如果仅考虑额外施用的镉，则三个花生品种的荚果总镉含量要高于根区镉暴露量。这表明通过钉子和荚果壳的吸收可能至少部分地导致了花生品种中Cd重新分布和积累的变化。植物通过两种途径（即分别通过根，通过钉和豆荚）吸收镉和内部镉易位似乎是确定花生籽粒中镉积累的重要机制。

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