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Sub-series 1: Angus & Robertson book reviews in bound volumes, 1894-1970

Increases in intracellular calcium concentration ([Ca²⁺] c ) mediate plant responses to stress by regulating the expression of genes encoding proteins that confer tolerance. Several plant stress genes have previously been shown to be calciumregulated, and in one case, a specific promoter motif Abscisic Acid Responsive-Element (ABRE) has been found to be regulated by calcium. A comprehensive survey of the Arabidopsis thaiiana transcriptome for calcium-regulated promoter motifs was performed by measuring the expression of genes in Arabidopsis seedlings responding to three calcium elevations of different characteristics, using full genome microarray analysis. This work revealed a total of 269 genes upregulated by [Ca²⁺] c in Arabidopsis. Bioinformatic analysis strongly indicated that at least four promoter motifs were [Ca²⁺] c -regulated in planta. We confirmed this finding by expressing in plants chimeric gene constructs controlled exclusively by these cis-elements and by testing the necessity and sufficiency of calcium for their expression. Our data reveal that the C-Repeat/Drought-Responsive Element, Site II, and CAM box (along with the previously identified ABRE) promoter motifs are calcium-regulated. The identification of these promoter elements targeted by the second messenger intracellular calcium has implications for plant signaling in response to a variety of stimuli, including cold, drought, and biotic stress.

The Plant cell, 2011-11, Vol.23 (11), p.4079-4095

Transcriptomic Analysis Reveals Calcium Regulation of Specific Promoter Motifs in Arabidopsis

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Sub-series 1: Angus & Robertson book reviews in bound volumes, 1894-1970

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Transcriptomic Analysis Reveals Calcium Regulation of Specific Promoter Motifs in Arabidopsis

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