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Unique root exudate tartaric acid enhanced cadmium mobilization and uptake in Cd-hyperaccumulator Sedum alfredii.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2019-09-06 , DOI: 10.1016/j.jhazmat.2019.121177 Qi Tao 1 , Junwen Zhao 1 , Jinxing Li 2 , Yuankun Liu 2 , Jipeng Luo 2 , Shu Yuan 1 , Bing Li 1 , Qiquan Li 1 , Qiang Xu 1 , Xiaofang Yu 3 , Huagang Huang 1 , Tingqiang Li 2 , Changquan Wang 1
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2019-09-06 , DOI: 10.1016/j.jhazmat.2019.121177 Qi Tao 1 , Junwen Zhao 1 , Jinxing Li 2 , Yuankun Liu 2 , Jipeng Luo 2 , Shu Yuan 1 , Bing Li 1 , Qiquan Li 1 , Qiang Xu 1 , Xiaofang Yu 3 , Huagang Huang 1 , Tingqiang Li 2 , Changquan Wang 1
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Low molecular weight organic acids (LMWOA) involved in heavy metal tolerance, translocation, and accumulation in plants. However, underlying mechanism of LMWOA secretion in metal mobilization and uptake in hyperaccumulator still need to be identified. In this study, a 13C labeling rhizobox was designed to investigate the composition and distribution of LMWOA in the rhizosphere of S. alfredii. The result showed that about 2.30%, 2.25% and 2.35% of the assimilated 13C was incorporated into oxalic acid, malic acid, and tartaric acid in rhizosphere of S. alfredii after 13CO2 assimilation, respectively. Oxalic acid, malic acid, and tartaric acid were the predominant LMWOA in rhizosphere soil solution of hyperaccumulating ecotype (HE) S. alfredii, however, almost no tartaric acid was detected for non-hyperaccumulating ecotype (NHE). Tartaric acid was identified as the unique root exudate from HE S. alfredii which was mainly distributed within the range of rhizosphere 0-6 mm. Tartaric acid significantly increased the solubility of four Cd minerals. HE S. alfredii treated with tartrate + CdCO3 had higher Cd contents and larger biomass than CdCO3 treatment. Cadmium accumulation in HE S. alfredii was promoted by the exudation of tartaric acid, which was highly efficient in Cd solubilization due to the formation of soluble Cd-tartrate complexes.
中文翻译：
独特的根分泌液酒石酸可增强镉超富集景天景天中的镉动员和吸收。
低分子量有机酸（LMWOA）参与植物对重金属的耐受性，易位和积累。然而，仍然需要确定金属动员中LMTOA分泌的根本机制以及在超蓄积物中的摄取。在这项研究中，设计了一种13C标记的根瘤菌盒，以研究S.alfredii根际中LMWOA的组成和分布。结果表明，在13CO 2同化后，分别约有2.30％，2.25％和2.35％的同化13C被掺入到S. alfredii的根际中的草酸，苹果酸和酒石酸中。草酸，苹果酸和酒石酸是高累积生态型（HE）苜蓿链球菌根际土壤溶液中的主要LMTOA，然而，非高累积生态型（NHE）几乎未检测到酒石酸。酒石酸被确定为苜蓿链球菌的独特根系分泌物，其主要分布在根际0-6 mm的范围内。酒石酸显着提高了四种Cd矿物的溶解度。酒石酸+ CdCO3处理的HE S. alfredii与CdCO3处理相比，具有更高的Cd含量和更大的生物量。酒石酸的渗出促进了镉在HE苜蓿链球菌中的积累，由于形成可溶性Cd-酒石酸盐络合物，其在Cd增溶中非常有效。
更新日期：2019-09-06
中文翻译：
独特的根分泌液酒石酸可增强镉超富集景天景天中的镉动员和吸收。
低分子量有机酸（LMWOA）参与植物对重金属的耐受性，易位和积累。然而，仍然需要确定金属动员中LMTOA分泌的根本机制以及在超蓄积物中的摄取。在这项研究中，设计了一种13C标记的根瘤菌盒，以研究S.alfredii根际中LMWOA的组成和分布。结果表明，在13CO 2同化后，分别约有2.30％，2.25％和2.35％的同化13C被掺入到S. alfredii的根际中的草酸，苹果酸和酒石酸中。草酸，苹果酸和酒石酸是高累积生态型（HE）苜蓿链球菌根际土壤溶液中的主要LMTOA，然而，非高累积生态型（NHE）几乎未检测到酒石酸。酒石酸被确定为苜蓿链球菌的独特根系分泌物，其主要分布在根际0-6 mm的范围内。酒石酸显着提高了四种Cd矿物的溶解度。酒石酸+ CdCO3处理的HE S. alfredii与CdCO3处理相比，具有更高的Cd含量和更大的生物量。酒石酸的渗出促进了镉在HE苜蓿链球菌中的积累，由于形成可溶性Cd-酒石酸盐络合物，其在Cd增溶中非常有效。
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