Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China.
Environ Sci Pollut Res Int. 2020 May;27(15):18403-18411. doi: 10.1007/s11356-020-08188-3. Epub 2020 Mar 18.
We investigated the hypothesis that root morphology plays a crucial role in the variation in chromium (Cr) accumulation among peanut (Arachis hypogaea L.) cultivars, using the relationship between Cr accumulation and morphological characteristics of six peanut cultivars determined under 0, 10, 25, 75, and 100 μmol L Cr(VI) via hydroponic experiment. Significant variations were observed in Cr accumulation and root morphological parameters among peanut cultivars at the five Cr levels. The Cr concentrations in plants exhibited 1.72-, 4.67-, 1.81-, and 2.91-fold variations within cultivars for 10, 25, 75, and 100 μmol L Cr treatments, respectively. Positive correlations were found for total Cr in plants with total root length (RL), root surface area (SA), and root volume (RV). Negative correlations were also observed between the percentages of Cr in shoots and specific root length. These results suggest that root system morphology may partly explain the variation in Cr accumulation among cultivars. Cultivars with greater RL, SA, and RV showed higher capability for Cr accumulation.
我们通过水培实验，研究了在 0、10、25、75 和 100 μmol L Cr(VI) 下，六种花生品种的 Cr 积累与形态特征之间的关系，从而提出了根系形态在花生品种间 Cr 积累变异中起着关键作用的假设。在五种 Cr 水平下，不同花生品种的 Cr 积累和根系形态参数存在显著差异。在 10、25、75 和 100 μmol L Cr 处理下，植株中的 Cr 浓度在品种内分别有 1.72、4.67、1.81 和 2.91 倍的变化。在植株中总 Cr 与总根长（RL）、根表面积（SA）和根体积（RV）呈正相关。在地上部 Cr 百分比与比根长之间也观察到了负相关。这些结果表明，根系形态可能部分解释了品种间 Cr 积累的变异。RL、SA 和 RV 较大的品种表现出更高的 Cr 积累能力。
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