文档介绍：Investigation of arsenic accumulation and senescence
by measuring possible indicators of arsenic stress in
Pteris vittata.
Masayoshi Hatayama1,*, Chihiro Inoue1 Kozo Shinoda2
1Graduate School of Environmental Studies 2Institute of Multidisciplinary Research for Advanced
Tohoku University Materials
Sendai, Japan Tohoku University
* Corresponding e-mail: ******@ Sendai, Japan
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Abstract—An arsenic-umulater, Pteris vittata, has been induces senescence-like degradation process in plants [5].
considered as an environmental friendly-method to clean up Several heavy metal-induced genes were up-regulated during
arsenic-contaminated water. Although P. vittata accumulates high leaf senescence. It is reported that there is mechanistic overlap
amount of arsenic up to approximately 2% of its dry-weight, the between the processes of heavy metal homeostasis and leaf
influence of senescence and As accumulation on each other, senescence such as a reactive oxygen species (ROS) of early
especially the extent the fern accumulates arsenic without cell event and Ca2+ level [6, 7]. And also, decreased in chlorophyll
death is not clearly understood. XSAM analysis showed that As content and PSII efficiency was observed to occur during
accumulation in a mature leaflet was not higher than that in a heavy metal