Chromium accumulation and changes in plant growth, selected phenolics and sugars of wild type and genetically modified Nicotiana langsdorffii

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• 作者：Massimo Del Bubba ; Claudia Ancillotti ; Leonardo Checchini ; Lorenzo Ciofi ; Donatella Fibbi ; Cristina Gonnelli ; Stefano Mosti
• 关键词：Phytoremediation ; Hexavalent chromium ; Nicotiana langsdorffii ; GR gene ; rolC gene
• 刊名：Journal of Hazardous Materials
• 出版年：15 November, 2013
• 年：2013
• 卷：262
• 期：Complete
• 页码：394-403
• 全文大小：1013 K

文摘

Chromium accumulation, dry weight (DW) biomass yield, water content and concentrations of some selected phenolic compounds and carbohydrates were determined in root and shoot of Nicotiana langsdorffii, either wild type (WT) or genetically modified by the insertion of GR and rolC genes, in response to the presence of Cr(VI) in the growth medium. A biomass decrease was observed for WT plants, but not for GR and rolC transformations, in response to Cr(VI) in the growth medium, highlighting a stress situation only in WT line. Shoot chromium concentrations were in all cases about 300 mg kg^鈭? DW. In root higher concentrations were found in rolC than in GR and WT (3843, 2600 and 2751 mg kg^鈭? DW, respectively). Based on the DW biomass, GR and WT accumulated higher chromium quantities than rolC, both in root (330 and 424 versus 85 渭g Cr per plant) and shoot (282 and 275 versus 121 渭g Cr per plant). Therefore, GR should be preferred to WT as a promising candidate for chromium phytoremediation.

Metabolic shifts of sugars and phenolics were generally observed in response to either gene insertions or exposure to Cr(VI), being the latter more related to the resistance to Cr(VI) than the former.