Abstract
In order to study the expression in plants of therolD promoter ofAgrobacterium rhizogenes, we have constructed chimaeric genes placing the coding region of thegusA (uidA) marker gene under control of tworolD promoter fragments of different length. Similar results were obtained with both genes. Expression studies were carried out in transformed R1 progeny plants. In mature transformed tobacco plants, therolD-gus genes were expressed strongly in roots, and to much lower levels in stems and leaves. This pattern of expression was transmitted to progeny, though the ratio of the level of expression in roots relative to that in leaves was much lower in young seedlings. The degree of root specificity inrolD-gus transformants was less than that of a gene constructed with domain A of the CaMV 35S promoter,domA-gus, but the level of root expression was much higher than with the latter gene. However, the level of expression of therolD-gus genes was less than that of agus gene with a 35S promoter with doubled domain B, 35S2-gus. TherolD-gus genes had a distinctive pattern of expression in roots, compared to that of the two other genes, with the strongest GUS activity observed in the root elongation zone and in vascular tissue, and much less in the root apex.
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Elmayan, T., Tepfer, M. Evaluation in tobacco of the organ specificity and strength of therolD promoter, domain A of the 35S promoter and the 35S2 promoter. Transgenic Research 4, 388–396 (1995). https://doi.org/10.1007/BF01973757
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DOI: https://doi.org/10.1007/BF01973757