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- W2040217656 abstract "Abstract Arsenic (As) accumulation and photosynthesis occur simultaneously in plants under As exposure. We investigated the effects of As and induced-phytoextraction methods on photosynthesis in two As hyperaccumulators ( Pteris vittata and Pteris cretica var. nervosa ) and two non-hyperaccumulators ( Pteris semipinnata and Pteris ensiformis ) under soil culture conditions. Chlorophyll fluorescence parameters (the maximum [ F v / F m ] and actual quantum efficiency [ F PSII ]) and the activities of three photosynthetic enzymes (ATPase, ribulose-1, 5-bisphosphate carboxylase [RuBPC] and glyceraldehyde-3-phosphate dehydrogenase [GAPDH]) were measured. Arsenic accumulation and photosynthetic behaviours in response to enhanced-phytoextraction methods (trans-1, 2-cyclobexylenedinitrilotetraacetic acid [CDTA] and phosphorous [P] addition and soil pH adjustment) of P. cretica and P. semipinnata were monitored and compared under conditions of 100 mg As kg −1 . Significant decreases in the F v / F m (19.9%) and F PSII (36.1%) were observed in P. vittata when exposed to 100 mg As kg −1 in comparison to the control (0 mg As kg −1 ). Compared to the control (0 mg As kg −1 ), the activities of GAPDH increased by 0.5% in P. cretica var. nervosa and decreased by only 8.3% in P. vittata even when both of them were treated with 200 mg As kg −1 , whereas a significant decrease, 56.1% and 51.7%, of this enzyme was observed in P. semipinnata and P. ensiformis , respectively, when exposed to 50 mg As kg −1 . Compared to the control (0 mg CDTA kg −1 or 0 mg P kg −1 ), the activities of ATPase increased by 53.7% and 82.7% in P. cretica when exposed to 0.5 g CDTA kg −1 and 50 mg P kg −1 , respectively, and an increase of up to 175% was also observed in P. semipinnata when exposed to 600 mg P kg −1 . The activities of GAPDH increased by 68.9% and 90.7% in P. cretica when exposed to 2 g CDTA kg −1 and 600 mg P kg −1 , respectively, but a decrease of up to 60% was observed in P. semipinnata when exposed to 2 g CDTA kg −1 . The uptake of As in P. semipinnata increased by 80.9% and 73.3% when 1 g CDTA kg −1 and 600 mg P kg −1 were added, respectively, compared to the control (0 g CDTA kg −1 or 0 mg P kg −1 ). It was concluded that GAPDH played an important role in the photosynthesis of As hyperaccumulators under As treatments." @default.
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- W2040217656 date "2012-01-01" @default.
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- W2040217656 title "The effects of arsenic and induced-phytoextraction methods on photosynthesis in Pteris species with different arsenic-accumulating abilities" @default.
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- W2040217656 doi "https://doi.org/10.1016/j.envexpbot.2011.08.002" @default.
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