Interactions between selenium and iodine uptake by spinach (Spinacia oleracea L.) in solution culture

Abstract

Interactions between Se (as selenate) and I (as iodate) uptake by spinach plants (Spinacia oleracea L.) were studied under controlled conditions using solution culture. Spinach readily accumulated both Se and I in the edible parts, the leaves, with solution-to-leaf transfer factors ranging from 3.5 to 13.4. The distribution coefficients between leaves and roots ranged from 4.07 to 5.66 for I and 4.51 to 8.59 for Se. Selenium concentrations in plant tissues were unaffected by addition of I to the nutrient solution. Similarly, plant I concentrations were unaffected by addition of Se to the nutrient solution, except in nutrient solution with I at a concentration of 50 µM, in which addition of Se lowered shoot I concentrations significantly, but the effect was of low magnitude. These results indicate the possible feasibility of dual supplementation of plant growth substrates with Se and I to improve human nutrition where these two elements are deficient in the diet. The data also indicate the involvement of a positive feedback mechanism in the uptake of Se by spinach plants, since Se concentrations in leaves increased disproportionately with increasing Se concentration in the nutrient solution.

Selenium species in the roots and shoots of chickpea plants treated with different concentrations of sodium selenite

“…Plants accumulate more Se in shoot than in root tissues, but there are exceptions as well (Zayed et al 1998). It has been shown that spinach, tea plants, and ryegrass accumulate Se in leaves (Zhu et al 2004;Hu et al 2003;Cartes et al 2005). These findings do not correlate with the results presented in the current paper, where Se content in shoots is higher than in roots only after long-term (45 days) Se exposure.…”

Effects of Se on the uptake of essential elements in Pteris vittata L.

“…High dosages of Se may be toxic to plants and compete with some essential elements, such as phosphorus (P) (Broyer et al 1972;Hopper and Parker 1999;Khattak et al 1991) and sulphur (S) (Hopper and Parker 1999;White et al 2004), resulting in the deficiency of these two elements in plants. On the contrary, supplementation of Se did not significantly affect the uptake of iodine (I) (Zhu et al 2004) and molybdenum (Mo) (Khattak et al 1991).…”

Fagopyrin and rutin concentration in seeds of common buckwheat plants treated with Se and I / Vsebnost fagopirina in rutina v semenih navadne ajde tretirane s selenom in jodom

“…However, it has been evidenced that Se has many positive effects on plants, capable of accumulating this element (Golob et al 2016). Recently there were some reports about combined effects of Se and I on plants (Zhu et al 2004, Smoleń et al 2014, 2016, Germ et al 2015, Osmić et al 2017, Jerše et al 2017. However, according to our knowledge, the effect of Se and I on buckwheat grain has not been studied.…”