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| Titel: |
Mercuric-Ion-Induced Gene Expression in Arabidopsis thaliana |
| Auteur: |
Heidenreich, Bernd Seidlitz, Harald Ernst, Dieter Sandermann, Heinrich |
| Verschenen in: |
International journal of phytoremediation |
| Paginering: | Jaargang 1 (1999) nr. 2 pagina's 153-167 |
| Jaar: |
1999-04-01 |
| Inhoud: |
Fourteen ecotypes of Arabidopsis thaliana were grown on agar, containing up to 40 μM HgCl2. Two groups could be identified: (1) sensitive ecotypes growing only up to 30 μM and (2) tolerant ecotypes growing at 40 μM. The tolerant ecotypes accumulated up to 100 mg mercury/kg fresh weight in their rosettes. Arabidopsis thaliana wild-type Columbia (Col-wt) was analyzed in more detail and showed an exponential mercury accumulation with increasing Hg2+-concentrations in the medium. Increasing Hg2+-concentrations resulted in a delayed growth of the plants. The roundish shape of the leaves changed to a more elongated form, and the leaf color changed from dark green to bright green. Hg2+-induced transcripts of several genes known to be induced by oxidative stress were measured and compared with the induction by ozone and UV-B. Glutathione-S-transferase (GST1) and several pathogenesis-related protein (PR) mRNAs were not induced in plants grown on Hg2+-containing medium. However, ozone fumigation increased the level of all these transcripts transiently. Similarly, UV-B irradiation resulted only in a weak mRNA increase. Metallothionein 1a (MT1a) transcript accumulation increased with rising Hg2+-concentrations, whereas MT2a mRNA level was unchanged. In contrast, MT2a transcripts were induced by ozone, whereas MT1a transcripts were unaffected. UV-B irradiation had a weak effect on MT1a and no effect on MT2a transcripts. These results indicate that different abiotic stressors led to differential transcript changes of Arabidopsis thaliana. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 8 gevonden artikelen
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