Difference in Cd2+ flux around the root tips of different soybean (Glycine max L.) cultivars and physiological response under mild cadmium stress

文献类型： 外文期刊

第一作者： Wang, Siqi

作者： Wang, Siqi;Dai, Huiping;Wang, Siqi;Wei, Shuhe;Skuza, Lidia;Chen, Yanqiu

作者机构：

关键词： Cd; Soybean; Influxes; Root tips; Root vigor; POD

期刊名称：CHEMOSPHERE （ 影响因子：8.943； 五年影响因子：8.52 ）

ISSN： 0045-6535

年卷期： 2022 年 297 卷

页码：

收录情况： SCI

摘要： The purpose of the study was to compare differences in Cd2+ flux in the vicinity of root tips of 20 soybean cultivars under mild Cd stress conditions using non-invasive micro-test technology (NMT). The results indicated that Cd2+ influx to the root tips under mild Cd treatment was higher compared to controls. Cd2+ influx showed an obvious spatial distribution, with the highest Cd2+ influx measured 300 mu m from the root tips, and a gradually decrease above and below this site. The cultivar Liaodou32 had a lower Cd uptake (3.40 pmol cm(-2) s(-1)), while Liaodou23 had a relatively higher Cd uptake (66.37 pmol cm(-2) s(-1)). Cluster analysis showed that the order of the average Cd2+ influx of the cultivars at a distance of 300 mu m from the root tips was as follows: high-uptake cultivars (61.80 pmol cm(-2) s(-1))> medium-high-uptake cultivars (33.92 pmol cm(-2) s(-1))> medium-low-uptake cultivars (19.78 pmol cm(-2) s(-1))> low-uptake cultivars (4.84 pmol cm(-2) s(-1)). We also analyzed physiological responses of different soybean cultivars to mild Cd stress. The results indicated that mild Cd stress could inhibit soluble protein production and root vigor among individual soybean cultivars. Moreover, stress increased SOD, CAT and POD activities and MDA content in root tissues. It should be noted that the physio-biochemical indicators of low-uptake cultivars did not change significantly after exposure to mild Cd stress compared to controls. Pearson's correlation analyses showed that all physio-biochemical indicators were significantly positively associated with influx, except of root SP and biomass. PCA analysis demonstrated that root vigor was a dominant factor causing the differences in Cd tolerance among different soybean seedling cultivars. NMT is of great significance for safe utilization of contaminated soil to distinguish the cultivars with different enrichment capacity for heavy metals from different crop cultivars.

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