Page 176 - Plant-Based Remediation Processes
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9 Phyto-transport and Assimilation of Selenium                  167























































            Fig. 9.1 Generalized Se metabolism in plants adapted from Parker et al. (2003) with some
            modification

            (CGS), which is responsible for catalyzing the formation of SeCysth, displays
            greater affinity for SeCys (K m ¼ 70 μM) than Cys (K m ¼ 240 μM) (Dawson and
            Anderson 1988). However, the enzymatic bioassays of CGS from Se hyperaccu-
            mulating and non-accumulating Astragalus species revealed that the enzyme from
            both groups had similar properties, suggesting that the Se accumulation and
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