Arsenic Uptake and Metabolism in Mycorrhizal As-Hyperaccumulator Pteris vittata : Symbiotic P Transporters and As Reductases

作者：Songge Deng, Yufei Yang, Chunyan Hu, Shufen Xiao, Yakov Kuzyakov, Chenjing Liu, Q. Lena · 发表于：Environmental Science & Technology · 年份：2025 · DOI：10.1021/acs.est.4c11639 · 被引用次数：8 · 研究领域：Mycorrhizal Fungi and Plant Interactions、Heavy metals in environment、Arsenic contamination and mitigation

Arbuscular mycorrhiza (AM) often protect host plants from As accumulation under arsenic stress; however, the opposite is true for the As-hyperaccumulator Pteris vittata . With non-hyperaccumulator Pteris ensiformis as a comparison, the AM colonization, P and As uptake, and genes associated with As metabolism were investigated in P. vittata after growing 60-day with Rhizophagus irregularis inoculation under 0 (As 0 ), 10 (As 10 ), or 100 μM As (As 100 ) treatments. Based on the As-induced increase in AM colonization (up to 21%), AM symbiosis promoted P. vittata growth by 24% and frond P content by 22% in the AM+As 100 treatment than As 100 treatment. These increases corresponded to 4.2- to 5.4-fold upregulation in symbiotic P transporter RiPT1 / 7 in AM fungi and PvPht1;6 in P. vittata roots, which probably supported 37% greater As accumulation at 4980 mg kg –1 in the fronds. Besides total As, enhanced arsenate reduction was evidenced by 19% greater arsenite and 15-fold upregulation of fungal arsenate reductase RiArsC in mycorrhizal roots. Further, the 2.1-fold upregulation of arsenite antiporters PvACR3/3;3 contributed to greater arsenite translocation to and sequestration in the fronds. Unlike P. ensiformis symbiont, which suffers from As stress, the mycorrhiza-specific P transporters (RiPT1/7 and PvPht1;6), arsenate reductases (RiArsC and PvHAC2), and arsenite antiporters (PvACR3/3;3) all benefited AM symbiosis and As accumulation in P. vittata .