It is accounted for that an arsenic hyperaccumulator ought to have focuses more than 1000 mg As kg?1 in its over-the-ground biomass (Bondada and Ma, 2003). What’s more, its exchange factor and bioconcentration factor ought to be more noteworthy than one. Utilizing these definitions, we have recognized three new arsenic hyperaccumulators in the Pteris class, to be specific, P. biaurita, P. quadriaurita and P. ryukyuensis, and re-affirmed P.cretica as an arsenic hyperaccumulator. These species are described by a high bioconcentration factor (N17.7) and high translocation factor (N7.3). Other arsenic hyperaccumulators in the Pteris family incorporates P. vittata (Komar et al., 1998; Ma et al., 2001a,b), and P. cretica, P. longifolia and P. umbrosa (Ma et al., 2001c; Zhao et al., 2002; Meharg, 2003). Nonetheless, not all the Pteris species are arsenic hyperaccumulators, for instance, P. stramina, P. tremula and P. semipinnata (Meharg, 2003), and P. ensiformis (Srivastava et al.,2005).
It is fascinating to take note of that the Pteris species and As hyperaccumulator P. calomelanos (Francesconi et al., 2001) have a place with the request Pteridales (Jones,1987). That these species can withstand the high arsenic focuses in the dirt propose that these plants may have a component to detoxify gathered As (Srivastava et al., 2005). The present examination has
demonstrated that the greater part of the As in the frond tissues is promptly removed into methanol and water, and this As is basically present as inorganic As(III), i.e. arsenite. As a result of its status as a hyperaccumulator and its generally strong nature, P. ryukyuensis ought to be viewed as the most appropriate species among the four plant species considered for phytoremediation purposes. Follow up work to look at the P. ryukyuensis with P. vittata
under an assortment of conditions may yield promising outcomes. Additionally examines are required to clarify the systems for As detoxification in Pteris and other related species that hyperaccumulate As.
This examination was bolstered to some extent by the United States National Science Foundation (Grant BES-0132114). We say thanks to Dr. M.B. White, Australia for giving the spores of P. ryukyuensis and P. biaurita. We might likewise want to express gratitude toward Gina Kertulis-Tarter and Mr. Thomas Luongo for their assistance in editing of the original copy and help with compound investigation.
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