In the past 20 years, several systems have been developed to control transgene expression in plants using chemicals. The components used to construct these systems are derived from regulatory sequences mostly from non-plant organisms such as bacteria, fungi, insects and mammals. These constructs allowed transgene expres-sion to be controlled temporally, spatially and quantitatively with the help of exogenous chemicals, without disturbing endogenous plant gene expression. Various chemically regulated transgene expression systems, their advantages/disadvantages and their potential for large-scale field application are reviewed.
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