Characterization of As efflux from the roots of As hyperaccumulator Pteris vittata L.

Yi Huang, Masayoshi Hatayama, Chihiro Inoue

研究成果: Article査読

26 被引用数 (Scopus)

抄録

In some plant species, various arsenic (As) species have been reported to efflux from the roots. However, the details of As efflux by the As hyperaccumulator Pteris vittata remain unknown. In this study, root As efflux was investigated for different phosphorus (P) supply conditions during or after a 24-h arsenate uptake experiment under hydroponic growth conditions. During an 8-h arsenate uptake experiment, P-supplied (P+) P. vittata exhibited much greater arsenite efflux relative to arsenate uptake when compared with P-deprived (P-) P. vittata, indicating that arsenite efflux was not proportional to arsenate uptake. In the As efflux experiment following 24 h of arsenate uptake, arsenate efflux was also observed with arsenite efflux in the external solution. All the results showed relatively low rates of arsenate efflux, ranging from 5. 4 to 16. 1% of the previously absorbed As, indicating that a low rate of arsenate efflux to the external solution is also a characteristic of P. vittata, as was reported with arsenite efflux. In conclusion, after 24 h of arsenate uptake, both P+ and P- P. vittata loaded/effluxed similar amounts of arsenite to the fronds and the external solution, indicating a similar process of xylem loading and efflux for arsenite, with the order of the arsenite concentrations being solution ≪ roots ≪ fronds.

本文言語English
ページ(範囲)1275-1284
ページ数10
ジャーナルPlanta
234
6
DOI
出版ステータスPublished - 2011 12
外部発表はい

ASJC Scopus subject areas

  • 遺伝学
  • 植物科学

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