論文 - 詳細
| RRC ID | 3988 |
|---|---|
| 著者 | Tamaoki M, Freeman JL, Pilon-Smits EA. |
| タイトル | Cooperative ethylene and jasmonic acid signaling regulates selenite resistance in Arabidopsis. |
| ジャーナル | Plant Physiol |
| Abstract |
Selenium (Se) is an essential element for many organisms, but excess Se is toxic. To better understand plant Se toxicity and resistance mechanisms, we compared the physiological and molecular responses of two Arabidopsis (Arabidopsis thaliana) accessions, Columbia (Col)-0 and Wassilewskija (Ws)-2, to selenite treatment. Measurement of root length Se tolerance index demonstrated a clear difference between selenite-resistant Col-0 and selenite-sensitive Ws-2. Macroarray analysis showed more pronounced selenite-induced increases in mRNA levels of ethylene- or jasmonic acid (JA)-biosynthesis and -inducible genes in Col-0 than in Ws-2. Indeed, Col-0 exhibited higher levels of ethylene and JA. The selenite-sensitive phenotype of Ws-2 was attenuated by treatment with ethylene precursor or methyl jasmonate (MeJA). Conversely, the selenite resistance of Col-0 was reduced in mutants impaired in ethylene or JA biosynthesis or signaling. Genes encoding sulfur (S) transporters and S assimilation enzymes were up-regulated by selenite in Col-0 but not Ws-2. Accordingly, Col-0 contained higher levels of total S and Se and of nonprotein thiols than Ws-2. Glutathione redox status was reduced by selenite in Ws-2 but not in Col-0. Furthermore, the generation of reactive oxygen species by selenite was higher in Col-0 than in Ws-2. Together, these results indicate that JA and ethylene play important roles in Se resistance in Arabidopsis. Reactive oxygen species may also have a signaling role, and the resistance mechanism appears to involve enhanced S uptake and reduction. |
| 巻・号 | 146(3) |
| ページ | 1219-30 |
| 公開日 | 2008-3-1 |
| DOI | 10.1104/pp.107.110742 |
| PII | pp.107.110742 |
| PMID | 18178671 |
| PMC | PMC2259059 |
| MeSH | Adaptation, Biological / genetics* Arabidopsis / genetics Arabidopsis / metabolism* Cyclopentanes / metabolism* Ethylenes / metabolism* Gene Expression Oxylipins / metabolism* Reactive Oxygen Species / metabolism Signal Transduction / physiology Sodium Selenite / metabolism* Sulfur / metabolism Up-Regulation |
| IF | 6.902 |
| 引用数 | 104 |
| WOS 分野 | PLANT SCIENCES |
| 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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| 各媒体での言及数の合計 | 0 |
| リソース情報 | |
| シロイヌナズナ / 植物培養細胞・遺伝子 | pda |