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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
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Promoter analysis of OsAMT1;2 and OsAMT1;3 implies their distinct roles in nitrogen utilization in rice
| Title: | Promoter analysis of OsAMT1;2 and OsAMT1;3 implies their distinct roles in nitrogen utilization in rice |
| Authors: | Yao, Shan-Guo Browse this author | | Sonoda, Yutaka Browse this author | | Tsutsui, Tomokazu Browse this author | | Nakamura, Hidemitsu Browse this author | | Ichikawa, Hiroaki Browse this author | | Ikeda, Akira Browse this author | | Yamaguchi, Junji Browse this author →KAKEN DB |
| Keywords: | Promoter | | OsAMT1;2 | | OsAMT1;3 | | Root | | Ammonium uptake | | Promoter | | OsAMT1;2 | | OsAMT1;3 | | Root | | Ammonium uptake |
| Issue Date: | 2008 |
| Publisher: | 日本育種学会 |
| Journal Title: | Breeding science |
| Issue: | 3 |
| Start Page: | 201 |
| End Page: | 207 |
| Abstract: | We previously reported two rice ammonium transporter (OsAMT) genes, OsAMT1;2 and OsAMT1;3, which show root-specific expression at the vegetative stage. To further understand the functional differences between the two genes, we used the promoter:: gusA reporter gene to investigate their detailed expression patterns. We show that in transgenic rice plants carrying individual 4-kb promoter::gusA fusion genes, the expression of the two genes was confined to roots during the entire plant life cycle, suggesting the housekeeping roles of the two transporters in rice. Detailed observation of the above transgenic lines further shows that OsAMT1;3 was preferentially expressed in the apices of seminal and lateral roots under nitrogendeficient conditions, and was repressed when supplied with ammonium. By contrast, OsAMT1;2 expression was induced most intensely in the root elongation zone under nitrogen-sufficient conditions. These observations suggest that the two genes have distinct roles in nitrogen utilization: OsAMT1;3 appears to function as a nitrogen sensor and OsAMT1;2 as an assimilator. In contrast to 4-kb promoters, gusA-reporter expression was not detected in the roots under both nitrogen-deficient and -sufficient conditions when using individual 2-kb promoter sequences proximal to transcription initiation sites for the two genes, indicating that distal 2-kb promoter sequences are essential for the root-specific expression and conditional responsiveness to nitrogen of OsAMT1;2 and OsAMT1;3 genes. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/43925 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山口 淳二
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