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The contents of total ASA and total glutathione were determinedby dissolving 0.1 g homogenates in 1ml of 5% mphosphporicacid solution. The extract was then centrifugedat 13,000 × g for 10 min at 4 ◦C. The supernatant was usedfor total ASA and total glutathione assay. Both total ASAand the reduced ASA contents were determined spectrophotometricallyat 525 nm using different reacting solutions; theformer was a potassium phosphate buffer (pH 7.4), dithiothreitoland N-ethlmaleimide, the latter was trichloroaceticacid, o-phosphoric acid, -dipyridyl in 70% alcohol andFeCl3 [38]. Total ASA and the reduced ASA contents werecalculated from a standard curve plotted from a known concentrationof ASA. In addition to total ASA and reducedASA contents, we also calculated the ratio of oxidized ASAto reduced ASA as an indication of the redox state of ascorbatein the roots. The content of oxidized ASA (VitaminC) was calculated by subtracting the reduced ASA contentfrom the total ASA content.
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