In Situ Speciation and Distribution of Toxic Selenium in Hydrated Roots of Cowpea1[C][W]

In situ speciation and distribution of toxic selenium in hydrated roots of cowpea.

The speciation and spatial distribution of selenium (Se) in hydrated plant tissues is not well understood. Using synchrotron-based x-ray absorption spectroscopy and x-ray fluorescence microscopy (two-dimensional scanning [and associated mathematical model] and computed tomography), the speciation and distribution of toxic Se were examined within hydrated roots of cowpea (Vigna unguiculata) expo...

Synchrotron-based X-ray absorption near-edge spectroscopy imaging for laterally resolved speciation of selenium in fresh roots and leaves of wheat and rice

Knowledge of the distribution of selenium (Se) species within plant tissues will assist in understanding the mechanisms of Se uptake and translocation, but in situ analysis of fresh and highly hydrated plant tissues is challenging. Using synchrotron-based fluorescence X-ray absorption near-edge spectroscopy (XANES) imaging to provide laterally resolved data, the speciation of Se in fresh roots ...

Cr (VI)/Cr (III) SPECIATION BY IN SITU ELECTRODEPOSITION ONTO TUBE PRIOR TO ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY

Fast X-Ray Fluorescence Microtomography of Hydrated Biological Samples

Metals and metalloids play a key role in plant and other biological systems as some of them are essential to living organisms and all can be toxic at high concentrations. It is therefore important to understand how they are accumulated, complexed and transported within plants. In situ imaging of metal distribution at physiological relevant concentrations in highly hydrated biological systems is...

Reducing the effect of salinity and lead on garlic (Allium sativum) seedling roots by improving oxidant defence under selenium and hydrogen sulfide

Selenium and hydrogen sulfide can alleviate the adverse effects of oxidative stress on plants by improving the oxidative defense system. In order to improve the oxidative defense system of garlic under lead and salinity stress by selenium and hydrogen sulfide, a factorial experiment was carried out using selenium and hydrogen sulfide in a completely randomized design with three replications. Ex...