Effect of Soil Water Contents on Arsenic Accumulation in Phytoliths of <i>Pteris multifida</i> and <i>Phragmites australis</i>
2022
Hyun-Gi Min | Min-Suk Kim | Jeong-Gyu Kim
The accumulation of metal(loid)s in phytoliths can physically immobilize the toxic materials and reduce toxicity in plant bodies and soil. Spider brake (<i>Pteris multifida</i>) is a well-known As hyperaccumulator that also harbors phytolith. However, As accumulation in phytoliths has not yet been studied with <i>P. multifida</i>. Soil water content is considered the main factor influencing phytolith accumulation. In this study, the As concentration in the phytoliths of <i>P. multifida</i> was compared with that in common reed (<i>Phragmites australis</i>) phytoliths with various soil water content. The range of As concentration in the phytoliths of <i>P. multifida</i> was 414.70–1610.74 mg kg<sup>−1</sup>, and the range for <i>P. australis</i> phytoliths was 41.67–126.54 mg kg<sup>−1</sup>. In <i>P. multifida</i>, higher soil water content increased As accumulation in the phytolith but did not affect the phytolith content in the plant. In <i>P. australis</i>, the higher soil water content increased phytolith content in the plant but decreased As concentration in phytoliths. This study suggests that <i>P. multifida</i> has higher As content in phytoliths than <i>P. australis</i>, and this accumulation can be affected by soil water content. The current findings provide how As encapsulated in phytolith and detoxified in different plants and conditions.
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