論文 - 詳細
| RRC ID | 3966 |
|---|---|
| 著者 | Yuan L, Graff L, Loqué D, Kojima S, Tsuchiya YN, Takahashi H, von Wirén N. |
| タイトル | AtAMT1;4, a pollen-specific high-affinity ammonium transporter of the plasma membrane in Arabidopsis. |
| ジャーナル | Plant Cell Physiol |
| Abstract |
Pollen represents an important nitrogen sink in flowers to ensure pollen viability. Since pollen cells are symplasmically isolated during maturation and germination, membrane transporters are required for nitrogen import across the pollen plasma membrane. This study describes the characterization of the ammonium transporter AtAMT1;4, a so far uncharacterized member of the Arabidopsis AMT1 family, which is suggested to be involved in transporting ammonium into pollen. The AtAMT1;4 gene encodes a functional ammonium transporter when heterologously expressed in yeast or when overexpressed in Arabidopsis roots. Concentration-dependent analysis of (15)N-labeled ammonium influx into roots of AtAMT1;4-transformed plants allowed characterization of AtAMT1;4 as a high-affinity transporter with a K(m) of 17 microM. RNA and protein gel blot analysis showed expression of AtAMT1;4 in flowers, and promoter-gene fusions to the green fluorescent protein (GFP) further defined its exclusive expression in pollen grains and pollen tubes. The AtAMT1;4 protein appeared to be localized to the plasma membrane as indicated by protein gel blot analysis of plasma membrane-enriched membrane fractions and by visualization of GFP-tagged AtAMT1;4 protein in pollen grains and pollen tubes. However, no phenotype related to pollen function could be observed in a transposon-tagged line, in which AtAMT1;4 expression is disrupted. These results suggest that AtAMT1;4 mediates ammonium uptake across the plasma membrane of pollen to contribute to nitrogen nutrition of pollen via ammonium uptake or retrieval. |
| 巻・号 | 50(1) |
| ページ | 13-25 |
| 公開日 | 2009-1-1 |
| DOI | 10.1093/pcp/pcn186 |
| PII | pcn186 |
| PMID | 19073648 |
| PMC | PMC2638712 |
| MeSH | Arabidopsis / genetics* Arabidopsis / metabolism Arabidopsis Proteins / genetics Arabidopsis Proteins / metabolism* Cation Transport Proteins / genetics Cation Transport Proteins / metabolism* Cell Membrane / metabolism Cloning, Molecular DNA, Bacterial / genetics Gene Expression Regulation, Plant Genes, Plant Mutagenesis, Insertional Plant Proteins / genetics Plant Proteins / metabolism* Plants, Genetically Modified / genetics Plants, Genetically Modified / metabolism Pollen / genetics* Pollen / metabolism Promoter Regions, Genetic Quaternary Ammonium Compounds / metabolism RNA, Plant / genetics |
| IF | 4.062 |
| 引用数 | 56 |
| WOS 分野 | PLANT SCIENCES CELL BIOLOGY |
| オルトメトリクス指標 |
オルトメトリクス指標項目
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| 最多言及媒体 | Patent(IFI CLAIMS) |
| 各媒体での言及数の合計 | 4 |
| 過去6か月間でのオルトメトリクス指標の変動値 | 0.0 |
| リソース情報 | |
| シロイヌナズナ / 植物培養細胞・遺伝子 | pst00530 |