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首页> 外文期刊>Plant and Soil >Arsenic hyperaccumulation and localization in the pinnule and stipe tissues of the gold-dust fern (Pityrogramma calomelanos (L.) Link var. austroamericana (Domin) Farw.) using quantitative micro-PIXE spectroscopy
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Arsenic hyperaccumulation and localization in the pinnule and stipe tissues of the gold-dust fern (Pityrogramma calomelanos (L.) Link var. austroamericana (Domin) Farw.) using quantitative micro-PIXE spectroscopy

机译：砷的高积累和定位在金粉蕨（Pityrogramma calomelanos（L.）Link var。austroamericana（Domin）Farw。）的粉刺和柄的组织中。

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Spatial distribution patterns of arsenic (As) in the tissues of a lesser-known As hyperaccumulating fern Pityrogramma calomelanos (L.) Link var. austroamericana (Domin) Farw. (Pteridaceae) have been studied. Quantitative micro-proton-induced X-ray emission (micro-PIXE) spectroscopy was employed to examine As localization in pinnule and stipe cross-sections of this species. In addition, As hyperaccumulation status of P. calomelanos var. austroamericana was compared with the well-known As hyperaccumulating fern Pteris vittata L. Both species were grown in pots under controlled conditions and exposed to four levels of As (0-500 mg As kg-p#) for 20 weeks. Pityrogramma calomelanos var. austroamericana accumulated up to 16 415 mg As kg-p# dry weight (DW), however, phytotoxicity symptoms such as necrotic pinnule tips and margins, appeared in fronds with concentrations >3,008 mg As kg-p# DW. Arsenic was readily translocated to fronds, with concentrations up to 75 times greater in fronds than in roots. Quantitative elemental maps of As generated using micro-PIXE analysis revealed that As concentrations in pinnule cross-sections were higher than in stipe cross-sections with concentrations of 3.7 x 10pd and 1.6 x 10pd mg As kg-p# DW, respectively (as determined by region selection analysis; RSA). In pinnules, RSA revealed variable concentrations of As, however did not resolve a clear pattern of compartmentalization across different anatomical regions. In stipe tissues, As concentrations followed the order vascular bundle > cortex > epidermis (as determined by RSA). Our results show that P. calomelanos var. austroamericana is an As hyperaccumulator and has the potential for use in phytoremediation of soils with low levels (up to 50 mg kg-p#) of As contamination.
机译：鲜为人知的高积累蕨类植物Pityrogramma calomelanos（L.）Link var。的组织中砷（As）的空间分布模式。澳洲（Domin）Farw。 （翼龙科）已被研究。定量的微质子诱导的X射线发射（micro-PIXE）光谱用于检查该物种的茎和柄横截面中的As定位。此外，由于P. calomelanos var。的过度积累状态。将奥氏菌与著名的As超积累蕨类植物Pteris vittata L进行了比较。两种植物都在受控条件下在盆中生长，并暴露于4种水平的As（0-500 mg As kg-p＃）下20周。炭疽菌奥古斯塔纳（Austroamericana）累积高达16 415 mg As kg-p＃DW的干重（DW），但在浓度大于3,008 mg As kg-p＃DW的叶中出现了植物毒性症状，如坏死的小穗尖端和边缘。砷容易转移到叶状体中，叶状体中的浓度比根中高75倍。使用micro-PIXE分析生成的As的定量元素图谱显示，针形截面中的As浓度高于刀柄截面中的As浓度，分别为3.7 x 10pd和1.6 x 10pd mg As kg-p＃DW（确定）区域选择分析; RSA）。在针状体中，RSA显示出不同浓度的As，但是不能解析清楚的不同解剖区域的区室化模式。在菌柄组织中，As浓度遵循血管束>皮层>表皮的顺序（由RSA确定）。我们的结果表明，P。calomelanos var。 austroamericana是一种As富集剂，有潜力用于对As污染程度低（最高50 mg kg-p＃）的土壤进行植物修复。

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