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Enhanced arsenic accumulation in hyperaccumulator Pteris vittata under elevated zinc conditions: Arsenic-related gene
Maria Manzoor1, Shufen Xiao1, Songge Deng1
1Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, and State Key Laboratory of Soil Pollution Control and Safety, Zhejiang University, Hangzhou, China.
Abstract:
Micronutrient Zn is toxic to plants at elevated concentrations. Interestingly, elevated Zn levels promote both plant growth and As uptake in As-hyperaccumulator Pteris vittata, though the mechanisms are unclear. In this study, P. vittata was hydroponically cultivated with 50 μM As and varying Zn levels at 0.8-75 μM. The 5 μM Zn treatment was the most effective, increasing plant biomass by 39 % and reducing malondialdehyde by 28 %, indicating lowered oxidative stress in P. vittata. Its frond As content increased by 57 %, while root P decreased by 30 %. Gene analysis showed reduced expression of P-transporter PvPht1;2, and increased expression of As-related P-transporters PvPht1;3/1;4, AsV reductases PvHAC1/2 and AsIII antiporters PvACR3;2/3;3. The results suggest enhanced As uptake, reduction, and transport under elevated Zn levels. The study highlights 5 μM Zn as optimal for promoting As accumulation and plant growth in P. vittata, offering potential for improving phytoremediation of As-contaminated sites.
