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Acorus calamus is a monocotyledonous wetland plant that can withstand extremely long periods of anoxia. We have investigated the expression of genes coding for pyruvate decarboxylase (Pdc), alcohol dehydrogenase (Adh), and fructose-1,6-bisphosphate aldolase (Ald) during periods of anoxia ranging from 2 h to 2 months. Upon anoxic incubation, Pdc mRNA levels peak at 6 h, followed by Adh and Ald, which peak at 12 and 72 h, respectively. Subsequently, the mRNA levels of all three genes decline within days to low levels. In contrast, alcohol dehydrogenase (ADH) protein levels increase steadily for at least a week and then remain constant. Native gel electrophoresis demonstrates the presence of two sets of ADH isozymes, one present constitutively, the other enhanced during anoxia. Translation initiation factor 4A protein levels, used as a control, remain constant during 2 months of anoxia. The results suggest that A. calamus has developed a complex anaerobic response consisting of differential regulation of transcription, translation, and posttranslational processes.

Long-Term Anoxia Tolerance (Multi-Level Regulation of Gene Expression in the Amphibious Plant Acorus calamus L.)