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, 4 (2), 343-55

The Nitrogen Response of a Barley C-hordein Promoter Is Controlled by Positive and Negative Regulation of the GCN4 and Endosperm Box

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The Nitrogen Response of a Barley C-hordein Promoter Is Controlled by Positive and Negative Regulation of the GCN4 and Endosperm Box

M Müller et al. Plant J.

Abstract

The 431 bp C-hordein promoter of lambda-1-17 exhibits a specific response to amino acids and NH4NO3 in developing barley (Hordeum vulgare L.) endosperms. With the aid of particle bombardment it is shown that the GCN4 motif ATGA(C/G)TCAT is the dominating cis-acting element in this response. But synergistic interaction with the neighbouring endosperm motif TGTAAAGT within the bifactorial prolamin element and cooperation with upstream sequences including a second prolamin-like element is an absolute requirement for a strong, positive regulation by an optimal nitrogen regime. Low nitrogen levels convert the GCN4 box into a negative motif. In contrast the endosperm box on its own exerted a silencing activity, independent of nitrogen nutrition. Sequence comparisons revealed that GCN4- and endosperm-like motifs are widely distributed among plant promoters. Their putative role in nitrogen regulation is discussed.

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