Before revision: The nature of these transporters is not yet fully solved, whether sulfate itself or metabolic products of the sulfur assimilation (O-acetylserine, cysteine, glutathione) act as signals in the regulation of sulfate uptake by the root and its transportto the shoot, and in the expression of the sulfate transporters involved.
After revision: It is not yet fully understood whether sulfate and other metabolic products of sulfur assimilation (O-acetylserine, cysteine, glutathione) act as signals in the regulation of sulfate uptake transport, or and in the expression of the sulfate transporters involved.