Publications by authors named "Si-Xue He"
Selenium-enhanced arsenic uptake by As-hyperaccumulators Pteris vittata and Pteris cretica is known, but how it impacts antimony (Sb) uptake and associated mechanisms are unclear. Here, we investigated the effects of 2.5 μM selenate (Se) on Sb uptake by two plants after growing for 10 days under hydroponics containing 10 or 50 μM antimonate (SbV) (Sb or Sb).
View Article and Find Full Text PDFArsenic-hyperaccumulator Pteris vittata exhibits remarkable absorption ability for chromium (Cr) while beneficial element selenium (Se) helps to reduce Cr-induced stress in plants. However, the effects of Se on the Cr uptake and the associated mechanisms in P. vittata are unclear, which were investigated in this study.
View Article and Find Full Text PDFIt is known that selenium (Se) enhances plant growth and arsenic (As) accumulation in As-hyperaccumulator Pteris vittata, but the associated mechanisms are unclear. In this study, P. vittata was exposed to 50 μM arsenate (AsV) under hydroponics plus 25 or 50 μM foliar selenate.
View Article and Find Full Text PDFMushrooms are consumed worldwide as they constitute a part of traditional cuisine culture in many countries. However, chromium (Cr) accumulation in mushrooms may constitute a potential pathway for its chronical exposure to humans. In this work, the Cr contents, distribution and bioaccessibility in 140 cultivated mushrooms from 14 species in 10 top-producing provinces in China were examined.
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- The study examines how copper (Cu) affects arsenic (As) accumulation in the As-hyperaccumulator plant Pteris vittata under hydroponic conditions.
- Results show that when exposed to both 50 µM As and Cu, P. vittata exhibited a 1.4-fold increase in As concentration and a 1.2-fold increase in biomass compared to As alone.
- The enhanced As uptake is linked to the upregulation of specific genes related to arsenic transport, translocation, and sequestration in the plant, suggesting potential for using P. vittata in cleaning up soils contaminated with both As and Cu.
The behaviors of antimony (Sb) and arsenic (As) in plants are different, though they are chemical analogs. Here, we examined the Sb uptake and speciation in two As-hyperaccumulators P. vittata and P.
View Article and Find Full Text PDFPhytate as a root exudate is rare in plants as it mainly serves as a P storage in the seeds; however, As-hyperaccumulator effectively secretes phytate and utilizes phytate-P, especially under As exposure. This study investigated the effects of As on its phytate and phytase exudation and the impacts of As and/or phytate on each other's uptake in through two hydroponic experiments. Under 10-100 μM arsenate (AsV), the exudation of phytate and phytase by was increased by 50-72% to 20.
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- Selenate boosts arsenic accumulation in a specific plant type known for absorbing arsenic, but the exact processes behind this effect were previously unclear.
- A study exposed the plants to different levels of arsenate and selenate in a hydroponic setup, measuring the plants' growth, arsenic, and selenium content, and the expression of key detoxification genes.
- The findings revealed that selenate is more effective than selenium alone in increasing arsenic levels in the plants, primarily by facilitating the conversion of arsenate to arsenite and enhancing its movement and storage within the plant.
Article Synopsis
- Antimony (Sb) and arsenic (As) behave differently in plants, leading to an experiment that studied Sb uptake in the As-hyperaccumulator species P. cretica using a hydroponic setup.
- The study found that P. cretica absorbed significantly more SbIII than SbV and accumulated over 97% of Sb in its roots, mainly in the cell walls, indicating a detoxification mechanism.
- Additionally, higher levels of SbIII reduced dissolved organic carbon in root exudates while promoting phosphorus accumulation in the plant, suggesting potential growth benefits for P. cretica.