Interaction between Sulfur and Α-Tocopherol and Their Effects on Alleviating Selenium Toxicity in Mung Bean Cuttings and Seedlings

Abstract

Physiologically, the sulphur (S) and α-tocopherol (α-T) role in alleviating selenium (Se) toxicity has been studied by using Hoagland solution as balanced environment for S and Se content in mung bean cuttings & seedlings. However, toxic selenium level at optimum promontory concentrations of both S and α-T were supplied to seedlings and cuttings of mung bean as experimental system, which taken from 10-day-old light grown seedlings under standard conditions.

The results indicated the following:

1. Raising of Se level in cutting and seedling parts (roots, hypocotyls, epicotyl and leaves) significantly, when Se was supplied individually.
2. Significant decline in Se-uptake and accumulation in plant tissues ,when supplied with S whereas, α-T had no effect on uptake that encouraging its translocation & accumulation in leaves .There after it causes , diminishing its conc. in hypocotyls and epicotyls . Consequently,  Se level was  declined in hypocotyls in both cases when S and α-T supplied individually  whereas, the situation was different when supplied together with Se , in terms of S & Se content.
3. The mechanism of Se-tolerance in seedlings of mung bean is reside in roots, that causes its accumulation and sequestration in seedling roots at high level coincided with low amount acropetally translocated, leaves (in case of using mung bean seedlings instead of cuttings).

Keywords: detoxification, mung bean cuttings, rooting response, selenium, sulfur, and α-   tocopherol.