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The transcriptional activator ABI3 is a key regulator of gene expression during embryo maturation in crucifers. In monocots, the related VP1 protein regulates the Em promoter synergistically with abscisic acid (ABA). We identified cis‐elements in the Brassica napus napin napA promoter mediating regulation by ABI3 and ABA, by analyzing substitution mutation constructs of napA in transgenic tobacco plantlets ectopically expressing ABI3. In transient analysis using particle bombardment of tobacco leaf sections, a tetramer of the distB ABRE (abscisic acid‐responsive element) mediated transactivation by ABI3 and ABI3‐dependent response to ABA, whereas a tetramer of the composite RY/G complex, containing RY repeats and a G‐box, mediated only ABA‐independent transactivation by ABI3. Deletion of the conserved B2 and B3 domains of ABI3 abolished transactivation of napA by ABI3. The two domains of ABI3 interact with different cis‐elements: B2 is necessary for ABA‐independent and ABA‐dependent activations through the distB ABRE, whereas B3 interacts with the RY/G complex. Thus B2 mediates the interaction of ABI3 with the protein complex at the ABRE. The regulation of napA by ABI3 differs from Em regulation by VP1, in that the B3 domain of ABI3 is essential for the ABA‐dependent regulation of napA.
The Plant Journal – Wiley
Published: Oct 1, 2000
Keywords: ; ; ; ; ;
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