Abstract
We previously reported identification and characterization of Arabidopsis molybdate transporter (MOT1). MOT1 is similar to sulfate transporters. To assess possible involvement of SULTRs in molybdate transport, we measured Mo contents in Arabidopsis 12 sulfate transporter T-DNA mutants grown with 170 nM Mo. SULTR1;2 T-DNA line exhibited lower Mo concentrations both in roots and shoots. Mo concentrations were 37% and 78% of those of wild-type plant in roots and shoots, respectively. To confirm those reductions of Mo concentration were caused by the defect of SULTR1;2, we measured Mo contents in the allelic mutants of sultr1;2 (sel1-8, sel1-9 and sel1-10). The Mo concentrations in roots and shoots of these mutant plants were also reduced to 22% and 56% (sel1-8); 37% and 55% (sel1-9); and 32% and 68% (sel1-10) of those in wild-type plants, respectively. Taken together, SULTR1;2 is involved in Mo uptake.
