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Metabolism and Enzymology

Differences in the Anaerobic Lactate-Succinate Production and in the Changes of Cell Sap pH for Plants with High and Low Resistance to Anoxia

Istituto Biosintesi Vegetali-CNR- Via Bassini 15, 20133 Milano, Italy, Ospedale Regina Elena, 00161 Roma, Italy, Centro per lo studio delle Sostanze Organiche Naturali-Dip. di Chimica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy

Anaerobically treated seedlings of Oryza sativa L. var arborio accumulated in their shoots more succinate than lactate and cell sap became alkaline. Conversely, in Triticum aestivum L. var MEK 86 lactate accumulation was far higher than that of succinate and cell sap was acidified. Anoxia clearly induced proton consumption in both species as an important means to prevent or counteract acidosis. Other species studied were: Echinochloa crus-galli L. Beauv., Zea mays L. var De Kalb XL75, Secale cereale L. var primizia and Hordeum vulgare L. var rondo. Changes in cell sap pH and succinate to lactate ratios distinguished resistant from nonresistant species.

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