Abstract
Magnesium deficiency, featuring with etiolated leaves, especially during fruit developmental stage, is a popular symptom of crops. To study this phenomenon, it is very important to understand Mg transportation manner. Therefore, we studied Mg distribution and uptake manner and tried to isolate Mg transporters using a rice plant as a model crop. Under Mg deficient condition, necrosis was observed at old leaves. And Mg concentration in xylem sap was higher than culture solution. These results suggested that there are several types of Mg transporters for Mg uptake and distribution. We isolated 6 candidate transporters, OsMGT1-6, homologues transporters to AtMGT10 which is a Mg transporter in Arabidopsis. Mg transport ability of some OsMGT was confirmed by functional complementation using mutant yeast. The mRNA amount and expression of OsMGT is now under analysis.
