Glucosinolate Distribution in the Aerial Parts of , a Disruption Mutant of the Sulfate Transporter SULTR1;2, in Mature Plants.

Plants take up sulfur (S), an essential element for all organisms, as sulfate, which is mainly attributed to the function of SULTR1;2 in . A disruption mutant of has been characterized with phenotypes similar to plants grown under sulfur deficiency (-S). Although the effects of -S on S metabolism were well investigated in seedlings, no studies have been performed on mature plants. To study further the effects of -S on S metabolism, we analyzed the accumulation and distribution of S-containing compounds in different parts of mature and of the wild-type (WT) plants grown under long-day conditions. While the levels of sulfate, cysteine, and glutathione were almost similar between and WT, levels of glucosinolates (GSLs) differed between them depending on the parts of the plant. GSLs levels in the leaves and stems were generally lower in than those in WT. However, seeds maintained similar levels of aliphatic GSLs to those in WT plants. GSL accumulation in reproductive tissues is likely to be prioritized even when sulfate supply is limited in for its role in S storage and plant defense.