Interactions of mycorrhizal fungi with Pteris vittata (As hyperaccumulator) in As-contaminated soils.
A greenhouse trial was conducted to investigate the role of arbuscular mycorrhizas (AM) in aiding arsenic (As) uptake and tolerance by Pteris vittata (As hyperaccumulator) and Cynodon dactylon (a multi-metal root accumulator). Plants inoculated with lived and killed native mycorrhizas isolated from an As mine site were grown in a sterile and slightly acidic soil. The infectious percentage of mycorrhizas (0 mg/kg As: 26.4%, 50 mg/kg As: 30.3%, 100 mg/kg As: 40.6%) and the average biomass of shoots in infected P. vittata increased (0 mg/kg As: 2.45 g/pot, 50 mg/kg As: 2.48 g/pot, 100 mg/kg As: 10.9 g/pot) according to the increase of As levels when compared to control. The indigenous mycorrhizas enhanced As accumulation (0 mg/kg As: 3.70 mg/kg, 50 mg/kg As: 58.3 mg/kg; 100 mg/kg As: 88.1 mg/kg) in the As mine populations of P. vittata and also sustained its growth by aiding P absorption. For C. dactylon, As was mainly accumulated in mycorrhizal roots and translocation to shoots was inhibited.
Leung
H M
HM
Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China.
Ye
Z H
ZH
Wong
M H
MH
D001151:Arsenic / Q000493:pharmacokinetics*; D018533:Biomass; D031744:Cynodon / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000032:analysis; D008906:Mining; D038821:Mycorrhizae / Q000502:physiology*; D009181:Mycoses / Q000378:metabolism / Q000382:microbiology; D010935:Plant Diseases / Q000382:microbiology; D018517:Plant Roots / Q000378:metabolism / Q000382:microbiology; D018520:Plant Shoots / Q000378:metabolism / Q000382:microbiology; D032495:Pteris / Q000378:metabolism*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000493:pharmacokinetics*
D008670:Metals; D012987:Soil; D012989:Soil Pollutants; D001151:Arsenic