The effect of selenium on yield quality of lettuce
2012
Alsina, I. | Dubova, L. | Smiltina, Z. | Stroksa, L. | Duma, M.
In human and animal cells Se plays an essential role in antioxidant defence system, but it is toxic at high dietary intake. In many countries as well as in Latvia soils are low in bioavailable Se. Selenium enters the food chain through the plants, which take it up from soil. Se concentration in plants depends on the chemical form of Se, its concentration and bioavailability in soil. The aim of the study was to detect the effect of sodium selenite and selenate on physiological properties and yield quality of lettuce. Two cultivars of lettuce plants (Lactuca sativa): iceberg lettuce ‘Tarzan’ and lettuce ‘Rīga’ were grown in 1-L pots with peat substrate. Lettuces were treated once with 170 or 340 μg L-1 of selenium as calculated doses of sodium selenite or selenate compared to a control - without added selenium. Fresh and dry weight of plants, pigment content, selenium accumulation, ascorbic acid content and antiradical activity were tested during vegetation period. Increase in plant pigments and ascorbic acid content were observed as a result of selenium treatment. No growth-promoting response to Se was observed for both selenium treatments. For plants fortification, sodium selenate seems more suitable.
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