Summary
The regulation in tobacco of the rolB and rolC promoters of Agrobacterium rhizogenes pRi 1855 TL-DNA was studied by using the β-glucuronidase (GUS) reporter system in transgenic plants. A 20- to 100-fold increase of GUS activity was selectively induced by auxin in rolB-GUS transformed mesophyll protoplasts, whereas this auxin-dependent increase was only 5-fold in rolC-GUS protoplasts. Moreover, both gene fusions exhibited similar tissue-specific expression in aerial parts but different patterns in roots. The spatial pattern of rolBGUS expression could be strongly modified by the addition of exogenous auxin, further suggesting that auxin plays a central role in the regulation of the rolB promoter in tobacco. The tissue-specific and auxin-dependent regulation of the rolB promoter is discussed in relation to the effects of the rolB gene on rhizogenesis and on cellular responses to auxin.
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Abbreviations
- BA:
-
benzoic acid
- 6-BAP:
-
benzylaminopurine
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- GUS:
-
β-glucuronidase
- 2,4,5-T:
-
2,4,5,-trichlorophenoxyacetic acid
- 2,4,6-T:
-
2,4,6-trichlorophenoxyacetic acid
- IAA:
-
indoleacetic acid
- NAA:
-
naphthaleneacetic acid
- MU:
-
4-methyl umbelliferone
- 35S CaMV:
-
cauliflower mosaic virus 35S (promoter)
- TCA:
-
trichloroacetic acid
- X-Glu:
-
5-bromo-4chloro-3-indolyl β-d-glucuronic acid
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Communicated by J. Schell
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Maurel, C., Brevet, J., Barbier-Brygoo, H. et al. Auxin regulates the promoter of the root-inducing rolB gene of Agrobacterium rhizogenes in transgenic tobacco. Mol Gen Genet 223, 58–64 (1990). https://doi.org/10.1007/BF00315797
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DOI: https://doi.org/10.1007/BF00315797