Interactions between atmospheric and pedospheric sulfur nutrition: Impact of short-term H2S exposure on the uptake and distribution of S-35-sulfate in roots and shoots of curly kale (Brassica oleracea L.)

Curlykale (Brassica oleracea L., Brassicaceae) was exposed to 0 and 400 nl l(-1) H2S and simultaneously transferred to a 25% Hoagland nutrient solution containing S-35-sulfate for 24 h. H2S exposure hardly affected the contents of the different sulfur pools, but resulted in a decrease in the level of S-35 in the plants and in the organic sulfur fraction of both roots and shoots. Evidently, H2S already induced a partial down-regulation of sulfate uptake by the root within 24 h and the plants start to transfer from sulfate to H2S as sulfur source for the synthesis of organic sulfur compounds.