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The impact of sulfate deprivation and atmospheric H 2 S and SO 2  nutrition on the content and composition of glucosinolates was studied in  Brassica juncea  and  B. rapa . Both species contained a number of aliphatic, aromatic and indolic glucosinolates. The total glucosinolate content was more than 5.5-fold higher in  B. juncea  than in  B. rapa , which could solely be attributed to the presence of high levels of sinigrin, which was absent in the latter species. Sulfate deprivation resulted in a strong decrease in the content and an altered composition of the glucosinolates of both species. Despite the differences in patterns in foliarly uptake and metabolism, their exposure hardly affected the glucosinolate composition of the shoot, both at sulfate-sufficient and sulfate-deprived conditions. This indicated that the glucosinolate composition in the shoot was hardly affected by differences in sulfur source (viz., sulfate, sulfite and sulfide). Upon sulfate deprivation, where foliarly absorbed H 2 S and SO 2  were the sole sulfur source for growth, the glucosinolate composition of roots differed from sulfate-sufficient  B. juncea  and  B. rapa , notably the fraction of the indolic glucosinolates was lower than that observed in sulfur-sufficient roots.

Atmospheric H2S and SO2 as sulfur source for Brassica juncea and Brassica rapa: impact on the glucosinolate composition