Liu, Chong; Sun, Dan; Zheng, Hong-Xiang; Wang, Guo-Bao; Liu, Wen-Shen; Cao, Yue; Tang, Ye-Tao; Qiu, Rong-Liang published the artcile< The limited exclusion and efficient translocation mediated by organic acids contribute to rare earth element hyperaccumulation in Phytolacca americana>, Reference of 112-63-0, the main research area is Phytolacca rare earth element translocation organic acid; Hyperaccumulator; Rhizosphere; Root exudate; Translocation; Yttrium.
Organic acids play an important role in metal tolerance, uptake, and translocation in hyperaccumulators. Phytolacca americana is a rare earth element (REE) hyperaccumulator, but the underlying mechanisms on REE tolerance and accumulation mediated by organic acids are poorly understood. Here, we reported for the first time the strategy of P. americana to enhance REE tolerance and accumulation through organic acids from root external secretion to internal biosynthesis. Different from the exclusion of heavy metal by organic acid in the typical plants, the results showed that oxalate secretion (0.3-0.6μmol h-1 g-1 root DW) induced by yttrium (Y) could not prevent Y from entering the roots, resulting in excess Y uptake by P. americana. Yttrium stress also stimulated the accumulation of malate and citrate by 1.4- and 2.0-folds in the root cortex. Exogenous malate and citrate promoted the redistribution of Y from the root cell walls to the shoot by 30% and 21%, resp. Based on comparative transcriptome anal., 6-fold up-regulation was observed in PaNIP1;2, whose homol. AtNIP1;2 is responsible for the transport of Al-malate in Arabidopsis. These results suggested that the promoted formation of Y-malate complexes within the roots potentially accelerated the transport of Y from P. americana roots to shoots through PaNIP1;2. Our study revealed the potential mechanism of organic acids in the external exclusion and internal detoxification and translocation of REE in P. americana roots, which provided a basis for improving the efficiency of REE phytoextraction
Science of the Total Environment published new progress about Arabidopsis. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.
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