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| Content Provider | Springer Nature Link |
|---|---|
| Author | Gális, Ivan Bilyeu, Kristin D. Godinho, Maria Joao G. Jameson, Paula E. |
| Copyright Year | 2005 |
| Abstract | Expression patterns of three Arabidopsis thaliana cytokinin oxidase/dehydrogenase promoter::GUS reporter fusions were investigated in tobacco plants. While cytokinin oxidase/dehydrogenase promoter 2 showed no expression in tobacco, the cytokinin oxidase/dehydrogenase promoters 3 and 4 were active in various tissues throughout development of the tobacco. Recently, the 1452 bp promoter region of AtCKX3 was reported as almost inactive in Arabidopsis. In contrast, the 1627 bp DNA fragment preceding the AtCKX3 coding region drove expression of the reporter GUS gene in various tobacco tissues. The promoter was mainly expressed in tobacco leaves and roots during early stages of development but also later in young flower buds as well as in pollen grains. The construct was particularly active before (hypocotyl region) and during (vascular system) lateral root initiation, supporting the idea of an inhibitory role of active cytokinins in the process of root initiation. The cytokinin oxidase/dehydrogenase promoter 4::GUS fusion in tobacco was shown to share some common (but weaker) expression patterns with promoter 3, namely in the leaves and pollen, but also conferred specific expression in tobacco root cap cells and trichomes. In addition, the response of cytokinin oxidase/dehydrogenase promoter::GUS reporter fusions to infection with the leafy gall-forming bacteria Rhodococcus fascians was examined. While an avirulent strain of R. fascians did not induce expression of any of the cytokinin oxidase/dehydrogenase promoters, the cytokinin oxidase/dehydrogenase promoter 3::GUS fusion was specifically induced at the site of infection when plants were challenged with a virulent strain of R. fascians, providing a possible explanation for the lack of significantly elevated cytokinin concentrations in tissues infected with virulent strains of R. fascians. |
| Starting Page | 173 |
| Ending Page | 182 |
| Page Count | 10 |
| File Format | |
| ISSN | 01676903 |
| Journal | Plant Growth Regulation |
| Volume Number | 45 |
| Issue Number | 3 |
| e-ISSN | 15735087 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 2005-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Arabidopsis Cytokinin oxidase/dehydrogenase Promoter analysis Rhodococcus fascians infection Tobacco Plant Physiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science Agronomy and Crop Science |
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