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Pyruvate decarboxylase (PDC, EC 4.1.1.1) and alcohol dehydrogenase (ADH, EC 1.1.1.1) are responsible for the anaerobic production of acetaldehyde and ethanol in higher plants. In developing soybean embryos, ADH activity increased upon imbibition and then declined exponentially with development, and was undetectable in leaves by 30 days after imbibition. PDC was not detectable in soybean leaves. In contrast, ADH activity remained high in developing cottonwood seedlings, with no decline in activity during development. ADH activity in the first fully expanded leaf of cottonwood was 230 micromoles NADH oxidized per minute per gram dry weight, and increased with leaf age. Maximal PDC activity of cottonwood leaves was 10 micromoles NADH oxidized per minute per gram dry weight. ADH activity in cottonwood roots was induced by anaerobic stress, increasing from 58 to 205 micromoles NADH oxidized per minute per gram dry weight in intact plants in 48 hours, and from 38 to 246 micromoles NADH oxidized per minute per gram dry weight in detached roots in 48 hours. Leaf ADH activity increased by 10 to 20% on exposure to anaerobic conditions. Crude leaf enzyme extracts with high ADH activity reduced little or no NADH when other aldehydes, such as trans-2-hexenal, were provided as substrate. ADH and PDC are constitutive enzyme in cottonwood leaves, but their metabolic role is not known.

plant physiology

Alcohol Dehydrogenase and Pyruvate Decarboxylase Activity in Leaves and Roots of Eastern Cottonwood (<i>Populus deltoides</i> Bartr.) and Soybean (<i>Glycine max</i> L.)

Alcohol Dehydrogenase and Pyruvate Decarboxylase Activity in Leaves and Roots of Eastern Cottonwood (Populus deltoides Bartr.) and Soybean (Glycine max L.)