イネのグルタチオントランスポーターOsGTL1は鉄欠乏で誘導される。

抄録

Glutathione (GSH) is involved in many aspects of plant growth and development. Transport and compartmentalization of GSH is essential to perform all these functions. We have cloned a GSH transporter from rice (OsGTL1). OsGTL1 is a putative member of oligopeptide transporter family and encode a polypeptide of 757 amino acids divided in 12 transmembrane domains. Electrophysiological measurements using Xenopus leavis oocytes showed that OsGTL1 is a functional GSH transporter. Microarray and Northern blot analysis revealed that the expression of OsGTL1 is upregulated in response to Fe-deficiency. GUS analysis driven by OsGTL1 promoter showed that expression of OsGTL1 is upregulated in response to Fe-deficiency especially in root tips of Fe-deficient rice. These results raised the possibility that GSH may have functions apart from that of an antioxidant and could play a role in Fe-deficiency tolerance in rice.