Host: The Japanese Society of Plant Physiologists
Pages 0027
We recently identified an Al-tolerant gene (HvAACT1) from barley, which encodes an Al-activated citrate transporter. Here, we report the closest homolog of this gene in rice (OsFRDL1). We compared the Al-induced citrate secretion between the wild-type rice and Tos-17 insertion lines. However, there was no difference in the citrate secretion between these lines. When these lines were grown in a nutrient solution with low Fe concentration, chlorosis on the new leaves was observed only in the knocknot lines. The concentration of Fe and citrate in the xylem sap was much lower and Fe precipitation in the root stele was observed in the knockout line. The protein encoded by this gene showed transport activity for citrate. This gene was expressed in the roots and the expression level was not affected by Fe nutrition. These results suggest that OsFRDL1 is a citrate transporter, which is necessary for Fe translocation to the shoot.
