The 35S promoter was isolated from the Cauliflower Mosaic Virus
(CaMV) and is one of the most widely used promoters in plant
transformation.
The 35S promoter is a very strong constitutive promoter, resulting
in high levels of gene expression in dicot plants. However, it is
less effective in monocots, especially in cereals.
Useful references:
Nagy, F. et al. (1985) Properties of expression of the 35S promoter
from CaMV in transgenic tobacco plants. Biotechnology in Plant
Science - Relevance to Agriculture in the Eighties. Ed. M. Zaitlin,
P. Day, A. Hollaender, C. M. Wilson. p. 227-235.
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